WhiteHorse Finance (WHF) 10-Q 14 Nov 22 2022 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2022	Nov. 10, 2022
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Transition Report	false
Document Period End Date	Sep. 30, 2022
Securities Act File Number	814-00967
Entity Registrant Name	WHITEHORSE FINANCE, INC
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	45-4247759
Entity Address, State or Province	FL
Entity Address, Address Line One	1450 Brickell Avenue
Entity Address, Address Line Two	31st Floor
Entity Address, City or Town	Miami
Entity Address, Postal Zip Code	33131
City Area Code	305
Local Phone Number	381-6999
Title of 12(b) Security	Common Stock, par value $0.001 per share
Trading Symbol	WHF
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		23,243,088
Entity Central Index Key	0001552198
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	Q3
Amendment Flag	false

Consolidated Statements of Asse

Consolidated Statements of Assets and Liabilities - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Assets
Investments, at fair value	$ 764,554	$ 819,208
Cash and cash equivalents	9,855	12,185
Restricted cash and cash equivalents	9,445	9,814
Restricted foreign currency (cost of $28 and $464, respectively)	17	469
Interest and dividend receivable	7,853	7,521
Amounts receivable on unsettled investment transactions	3,288
Escrow receivable	711	515
Prepaid expenses and other receivables	925	1,307
Unrealized appreciation on foreign currency forward contracts	10
Total assets	796,658	851,019
Liabilities
Debt	430,992	475,958
Distributions payable	8,251	8,222
Management fees payable	3,881	3,766
Incentive fees payable	4,335	7,958
Amounts payable on unsettled investment transactions	331
Interest payable	3,772	2,087
Accounts payable and accrued expenses	1,526	2,438
Advances received from unfunded credit facilities	551	839
Total liabilities	453,639	501,268
Commitments and contingencies (See Note 8)
Net assets
Common stock, 23,243,088 and 23,162,667 shares issued and outstanding, par value $0.001 per share, respectively, and 100,000,000 shares authorized	23	23
Paid-in capital in excess of par	340,264	339,161
Accumulated earnings	2,732	10,567
Total net assets	343,019	349,751
Total liabilities and total net assets	$ 796,658	$ 851,019
Number of shares outstanding	23,243,088	23,162,667
Net asset value per share	$ 14.76	$ 15.10
Non-controlled/non-affiliate company investments
Assets
Investments, at fair value	$ 650,585	$ 736,727
Non-controlled affiliate company investments
Assets
Investments, at fair value	11,903	6,874
Controlled affiliate company investments
Assets
Investments, at fair value	$ 102,066	$ 75,607

Consolidated Statements of As_2

Consolidated Statements of Assets and Liabilities (Parenthetical) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2022	Dec. 31, 2021
Consolidated Statements of Assets and Liabilities
Investments, amortized cost	$ 773,406	$ 831,960
Restricted foreign currency, cost	$ 28	$ 464
Derivative Asset, Type [Extensible Enumeration]	Foreign Exchange Forward [Member]	Foreign Exchange Forward [Member]
Common Stock, Par or Stated Value Per Share	$ 0.001	$ 0.001
Common Stock, Shares Authorized	100,000,000	100,000,000
Common Stock, Shares, Issued	23,243,088	23,162,667
Common Stock, Shares, Outstanding	23,243,088	23,162,667

Consolidated Statements of Oper

Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Investment income
Total investment income	$ 21,558	$ 18,378	$ 61,592	$ 53,689
Expenses
Interest expense	5,632	3,842	15,351	11,456
Base management fees	3,881	3,508	11,741	10,209
Performance-based incentive fees	1,027	2,069	4,291	6,739
Administrative service fees	171	171	512	512
General and administrative expenses	884	896	2,919	2,592
Total expenses	11,595	10,486	34,814	31,508
Net investment income before excise tax	9,963	7,892	26,778	22,181
Excise tax	195	253	594	845
Net investment income after excise tax	9,768	7,639	26,184	21,336
Realized and unrealized gains (losses) on investments and foreign currency transactions
Net realized gains (losses)			(15,537)	7,714
Foreign currency transactions	(6)	(206)	(348)	(209)
Foreign currency forward contracts		1	(8)	(3)
Net realized gains (losses)	230	(96)	(15,893)	7,502
Net change in unrealized appreciation (depreciation)			4,159	(2,234)
Translation of assets and liabilities in foreign currencies	1,713	263	2,441	161
Foreign currency forward contracts	10	187	10	186
Net change in unrealized appreciation (depreciation)	(6,153)	732	6,610	(1,887)
Net realized and unrealized gains (losses) on investments and foreign currency transactions	(5,923)	636	(9,283)	5,615
Net increase in net assets resulting from operations	$ 3,845	$ 8,275	$ 16,901	$ 26,951
Per Common Share Data
Basic earnings per common share	$ 0.17	$ 0.40	$ 0.73	$ 1.30
Diluted earnings per common share	0.17	0.40	0.73	1.30
Dividends and distributions declared per common share	$ 0.36	$ 0.36	$ 1.07	$ 1.07
Basic weighted average common shares outstanding	23,243,088	20,851,435	23,224,990	20,677,545
Diluted weighted average common shares outstanding	23,243,088	20,851,435	23,224,990	20,677,545
Non-controlled/non-affiliate company investments
Investment income
Interest income	$ 17,121	$ 15,199	$ 49,890	$ 44,159
Fee income	423	1,224	1,564	2,344
Dividend income	100	35	268	144
Realized and unrealized gains (losses) on investments and foreign currency transactions
Net realized gains (losses)	236	109	(17,262)	7,714
Net change in unrealized appreciation (depreciation)	(7,275)	(1,370)	5,296	(3,937)
Non-controlled affiliate company investments
Investment income
Interest income	95		228
Dividend income	21	76	261	1,042
Realized and unrealized gains (losses) on investments and foreign currency transactions
Net realized gains (losses)			1,725
Net change in unrealized appreciation (depreciation)	(389)	792	(2,596)	1,112
Controlled affiliate company investments
Investment income
Interest income	1,753	905	4,339	2,362
Dividend income	2,045	939	5,042	3,638
Realized and unrealized gains (losses) on investments and foreign currency transactions
Net change in unrealized appreciation (depreciation)	$ (212)	$ 860	$ 1,459	$ 591

Consolidated Statements of Chan

Consolidated Statements of Changes in Net Assets - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2022	Sep. 30, 2021
Increase (Decrease) in Stockholders' Equity
Beginning Balance	$ 347,425	$ 347,919	$ 349,751	$ 319,621	$ 314,349	$ 312,897	$ 349,751	$ 312,897
Beginning Balance (in shares)			23,162,667				23,162,667
Stock issued in connection with at-the-market offering		(72)	$ 197	$ 1,438	1,894	590
Stock issued in connection with at-the-market offering (in shares)				214,278			80,421	390,842
Stock issued in connection with dividend reinvestment plan		480	498	$ 1,823	225
Net increase in net assets resulting from operations:
Net investment income after excise tax	9,768	7,877	8,539	7,639	6,100	7,600
Net realized gains (losses) on investments	230	2,342	(18,465)	(96)	(563)	8,161
Net change in unrealized appreciation (depreciation) on investments	(6,153)	(2,870)	15,633	732	4,974	(7,592)
Distributions declared	(8,251)	(8,251)	(8,234)	(7,433)	(7,358)	(7,307)
Ending Balance	$ 343,019	347,425	347,919	323,724	319,621	314,349	$ 343,019	$ 323,724
Ending Balance (in shares)	23,243,088						23,243,088
Common Stock
Increase (Decrease) in Stockholders' Equity
Beginning Balance	$ 23	$ 23	$ 23	$ 21	$ 21	$ 21	$ 23	$ 21
Beginning Balance (in shares)	23,243,088	23,211,413	23,162,667	20,722,596	20,583,835	20,546,032	23,162,667	20,546,032
Stock issued in connection with at-the-market offering (in shares)			16,678	94,897	124,252	37,803
Stock issued in connection with dividend reinvestment plan (in shares)		31,675	32,068	119,381	14,509
Net increase in net assets resulting from operations:
Ending Balance	$ 23	$ 23	$ 23	$ 21	$ 21	$ 21	$ 23	$ 21
Ending Balance (in shares)	23,243,088	23,243,088	23,211,413	20,936,874	20,722,596	20,583,835	23,243,088	20,936,874
Paid-in Capital in Excess of Par
Increase (Decrease) in Stockholders' Equity
Beginning Balance	$ 340,264	$ 339,856	$ 339,161	$ 302,711	$ 300,592	$ 300,002	$ 339,161	$ 300,002
Stock issued in connection with at-the-market offering		(72)	197	1,438	1,894	590
Stock issued in connection with dividend reinvestment plan		480	498	1,823	225
Net increase in net assets resulting from operations:
Ending Balance	340,264	340,264	339,856	305,972	302,711	300,592	340,264	305,972
Accumulated Earnings (Loss)
Increase (Decrease) in Stockholders' Equity
Beginning Balance	7,138	8,040	10,567	16,889	13,736	12,874	10,567	12,874
Net increase in net assets resulting from operations:
Net investment income after excise tax	9,768	7,877	8,539	7,639	6,100	7,600
Net realized gains (losses) on investments	230	2,342	(18,465)	(96)	(563)	8,161
Net change in unrealized appreciation (depreciation) on investments	(6,153)	(2,870)	15,633	732	4,974	(7,592)
Distributions declared	(8,251)	(8,251)	(8,234)	(7,433)	(7,358)	(7,307)
Ending Balance	$ 2,732	$ 7,138	$ 8,040	$ 17,731	$ 16,889	$ 13,736	$ 2,732	$ 17,731

Consolidated Statements of Cash

Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Cash flows from operating activities
Net increase in net assets resulting from operations	$ 16,901	$ 26,951
Adjustments to reconcile net increase in net assets resulting from operations to net cash (used in) operating activities:
Paid-in-kind income	(1,553)	(860)
Net realized (gains) losses on investments	15,537	(7,714)
Net unrealized depreciation (appreciation) on investments	(4,159)	2,234
Net unrealized (appreciation) depreciation on translation of assets and liabilities in foreign currencies	(2,441)	(161)
Net unrealized (appreciation) depreciation on foreign currency forward contracts	(10)	(186)
Accretion of discount	(4,036)	(5,649)
Amortization of deferred financing costs	1,149	976
Acquisition of investments	(223,752)	(328,735)
Proceeds from principal payments and sales of portfolio investments	196,382	257,197
Proceeds from sales of portfolio investments to STRS JV	75,415	86,143
Net changes in operating assets and liabilities:
Interest and dividend receivable	(342)	(695)
Escrow receivable	618	(832)
Prepaid expenses and other receivables	382	(101)
Amounts receivable on unsettled investment transactions	(3,288)	(10,772)
Amounts payable on unsettled investment transactions	331	2,883
Management fees payable	115	154
Incentive fees payable	(3,623)	1,287
Accounts payable and accrued expenses	(912)	(25)
Interest payable	1,685	331
Advances received from unfunded credit facilities	(288)	124
Net cash provided by operating activities	64,111	22,550
Cash flows from financing activities
Proceeds from issuance of common stock, net of offering costs	125	3,922
Borrowings	109,066	160,599
Repayments of debt	(152,417)	(166,047)
Deferred financing costs	(580)	(474)
Distributions paid to common stockholders, net of distributions reinvested	(23,728)	(19,911)
Net cash used in financing activities	(67,534)	(21,911)
Effect of exchange rate changes on cash	272	(14)
Net change in cash, cash equivalents and restricted cash	(3,151)	625
Cash, cash equivalents and restricted cash at beginning of period	22,468	15,944
Cash, cash equivalents and restricted cash at end of period	19,317	16,569
Supplemental and non-cash disclosure of cash flow information:
Interest paid	12,517	10,132
Distributions reinvested	978	2,048
Non-cash exchanges of investments	$ 25,000	$ 20,280

Consolidated Statements of Ca_2

Consolidated Statements of Cash Flows - Total cash, cash equivalents and restricted cash - USD ($) $ in Thousands	Sep. 30, 2022	Sep. 30, 2021
Reconciliation of cash, cash equivalents
Cash and cash equivalents	$ 9,855	$ 9,579
Restricted cash and cash equivalents	9,445	6,749
Restricted foreign currency	17	241
Total cash, cash equivalents and restricted cash presented in consolidated statements of cash flows	$ 19,317	$ 16,569

Consolidated Schedule of Invest

Consolidated Schedule of Investments £ in Thousands, $ in Thousands, $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2022 USD ($)	Dec. 31, 2021 USD ($)	Sep. 30, 2022 CAD ($)	Sep. 30, 2022 GBP (£)	Dec. 31, 2021 CAD ($)	Dec. 31, 2020 USD ($)
Schedule of Investments [Line Items]
Investments, amortized cost	$ 773,406	$ 831,960
Investments, at fair value	$ 764,554	$ 819,208
Percent of net assets	222.86%	234.24%	222.86%	222.86%	234.24%
PIK interest rate		1.50%			1.50%
Qualifying Assets Required Of Acquiree At Time Of Acquisition Of Total Assets	70%	70%
Qualifying Assets Of Acquired Of Total Assets	82.40%	88.20%
Investments Of Net Assets	222.90%	234.20%
Investment Of Total Assets	96%	96.30%
Additional interest for senior term debt		2.75%
Additional Interest For Senior Term Debt		3.50%
Additional interest for senior term debt		3%
Interest Issuer May Pay In Cash Or Cash And PIK.		2%
Interest Investment Earns When Converted On Annual Basis		14%
One-month LIBOR		0.10%
Three-month LIBOR		0.21%
Six-month LIBOR		0.34%
SOFR		0.05%
CDOR		0.52%
Canadian prime		2.45%
Prime		3.25%
Unrealized appreciation	$ 10
Morgan Stanley
Schedule of Investments [Line Items]
Unrealized appreciation	$ 10
Morgan Stanley | CAD
Schedule of Investments [Line Items]
Currency to be sold	199
Morgan Stanley | USD
Schedule of Investments [Line Items]
Currency to be purchased	155
Advertising
Schedule of Investments [Line Items]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 9,763
Investments, at fair value	$ 9,782
Air Freight & Logistics
Schedule of Investments [Line Items]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 3,531
Investments, at fair value	$ 3,557
Application Software
Schedule of Investments [Line Items]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 13,183	$ 13,247
Investments, at fair value	$ 13,411	$ 13,518
Building Products
Schedule of Investments [Line Items]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 14,125	$ 16,441
Investments, at fair value	$ 14,305	$ 16,603
Construction & Engineering
Schedule of Investments [Line Items]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 8,534	$ 13,626
Investments, at fair value	$ 8,625	$ 13,975
Data Processing & Outsourced Services
Schedule of Investments [Line Items]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 15,497	$ 15,766
Investments, at fair value	$ 14,507	$ 16,160
Diversified Support Services
Schedule of Investments [Line Items]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 12,302	$ 12,773
Investments, at fair value	$ 11,741	$ 10,489
Electronic Equipment & Instruments
Schedule of Investments [Line Items]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 13,564	$ 6,680
Investments, at fair value	$ 13,485	$ 6,687
Environmental & Facilities Services
Schedule of Investments [Line Items]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 18,577	$ 6,780
Investments, at fair value	$ 18,641	$ 6,872
Household Appliances
Schedule of Investments [Line Items]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 8,325
Investments, at fair value	$ 7,773
Industrial Machinery
Schedule of Investments [Line Items]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 15,168	$ 6,727
Investments, at fair value	$ 15,276	$ 6,815
Internet & Direct Marketing Retail
Schedule of Investments [Line Items]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 18,901	$ 15,153
Investments, at fair value	$ 19,114	$ 15,353
Investment Banking & Brokerage
Schedule of Investments [Line Items]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 5,643	$ 9,943
Investments, at fair value	$ 5,687	$ 10,054
IT Consulting And Other Services
Schedule of Investments [Line Items]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 34,933	$ 40,384
Investments, at fair value	$ 33,342	$ 40,697
Leisure Products
Schedule of Investments [Line Items]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 8,945	$ 8,931
Investments, at fair value	$ 9,044	$ 8,930
Packaged Foods & Meats
Schedule of Investments [Line Items]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 12,297	$ 26,802
Investments, at fair value	$ 11,998	$ 25,606
Personal Products
Schedule of Investments [Line Items]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 3,639	$ 4,185
Investments, at fair value	$ 3,698	$ 4,273
Real Estate Operating Companies
Schedule of Investments [Line Items]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 10,777	$ 4,781
Investments, at fair value	$ 10,722	$ 4,780
Research & Consulting Services
Schedule of Investments [Line Items]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 8,799	$ 8,852
Investments, at fair value	$ 8,832	$ 8,901
Systems Software
Schedule of Investments [Line Items]
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investments, amortized cost		$ 9,801
Investments, at fair value		$ 9,898
Technology Hardware, Storage & Peripherals
Schedule of Investments [Line Items]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 14,899	$ 14,694
Investments, at fair value	$ 14,991	14,725
Debt Investments
Schedule of Investments [Line Items]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 727,213	794,969
Investments, at fair value	$ 716,495	$ 781,049
Percent of net assets	208.83%	223.32%	208.83%	208.83%	223.32%
Debt Investments | Advertising
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investments, amortized cost		$ 9,490
Investments, at fair value		$ 9,488
Percent of net assets		2.71%			2.71%
Debt Investments | Air Freight & Logistics
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 15,655	$ 20,021
Investments, at fair value	$ 15,440	$ 20,129
Percent of net assets	4.50%	5.75%	4.50%	4.50%	5.75%
Debt Investments | Alternative Carriers
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments		Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 12,040
Investments, at fair value	$ 11,993
Percent of net assets	3.50%		3.50%	3.50%
Debt Investments | Application Software
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 20,674	$ 22,460
Investments, at fair value	$ 18,145	$ 22,590
Percent of net assets	5.28%	6.46%	5.28%	5.28%	6.46%
Debt Investments | Asset Management & Custody Banks
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments		Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 10,108
Investments, at fair value	$ 10,169
Percent of net assets	2.97%		2.97%	2.97%
Debt Investments | Automotive Retail
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 14,532	$ 15,193
Investments, at fair value	$ 14,594	$ 15,286
Percent of net assets	4.25%	4.37%	4.25%	4.25%	4.37%
Debt Investments | Broadcasting
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 8,052	$ 8,027
Investments, at fair value	$ 7,942	$ 8,027
Percent of net assets	2.32%	2.30%	2.32%	2.32%	2.30%
Debt Investments | Building Products
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 26,714	$ 43,653
Investments, at fair value	$ 24,714	$ 43,757
Percent of net assets	7.20%	12.51%	7.20%	7.20%	12.51%
Debt Investments | Cable & Satellite
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 14,891	$ 14,936
Investments, at fair value	$ 14,323	$ 14,526
Percent of net assets	4.18%	4.15%	4.18%	4.18%	4.15%
Debt Investments | Commodity Chemicals
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 15,777	$ 15,047
Investments, at fair value	$ 16,003	$ 15,172
Percent of net assets	4.67%	4.34%	4.67%	4.67%	4.34%
Debt Investments | Construction & Engineering
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investments, amortized cost		$ 10,814
Investments, at fair value		$ 11,086
Percent of net assets		3.17%			3.17%
Debt Investments | Construction Materials
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 8,402	$ 7,725
Investments, at fair value	$ 8,168	$ 7,673
Percent of net assets	2.37%	2.20%	2.37%	2.37%	2.20%
Debt Investments | Consumer Finance
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investments, amortized cost		$ 9,455
Investments, at fair value		$ 9,628
Percent of net assets		2.76%			2.76%
Debt Investments | Data Processing & Outsourced Services
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 39,673	$ 31,301
Investments, at fair value	$ 41,019	$ 31,971
Percent of net assets	11.96%	9.14%	11.96%	11.96%	9.14%
Debt Investments | Department Stores
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investments, amortized cost		$ 13,331
Investments, at fair value		$ 13,538
Percent of net assets		3.87%			3.87%
Debt Investments | Distributors
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 5,326	$ 4,949
Investments, at fair value	$ 3,618	$ 4,025
Percent of net assets	1.05%	1.15%	1.05%	1.05%	1.15%
Debt Investments | Diversified Chemicals
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 14,867	$ 18,643
Investments, at fair value	$ 13,941	$ 18,360
Percent of net assets	4.06%	5.25%	4.06%	4.06%	5.25%
Debt Investments | Diversified Support Services
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 11,264	$ 11,459
Investments, at fair value	$ 11,165	$ 11,460
Percent of net assets	3.25%	3.28%	3.25%	3.25%	3.28%
Debt Investments | Education Services
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 13,315	$ 13,235
Investments, at fair value	$ 13,285	$ 13,231
Percent of net assets	3.87%	3.79%	3.87%	3.87%	3.79%
Debt Investments | Electric Utilities
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 10,331	$ 10,299
Investments, at fair value	$ 10,408	$ 10,296
Percent of net assets	3.03%	2.94%	3.03%	3.03%	2.94%
Debt Investments | Electronic Equipment & Instruments
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investments, amortized cost		$ 6,684
Investments, at fair value		$ 6,687
Percent of net assets		1.91%			1.91%
Debt Investments | Environmental & Facilities Services
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 18,251	$ 32,174
Investments, at fair value	$ 18,108	$ 32,173
Percent of net assets	5.28%	9.20%	5.28%	5.28%	9.20%
Debt Investments | Health Care Facilities
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Health Care Facilities			Health Care Facilities
Investments, amortized cost	$ 10,392	$ 36,949
Investments, at fair value	$ 10,318	$ 25,576
Percent of net assets	3.01%	7.31%	3.01%	3.01%	7.31%
Debt Investments | Health Care Services
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 33,516	$ 57,609
Investments, at fair value	$ 32,756	$ 57,037
Percent of net assets	9.56%	16.30%	9.56%	9.56%	16.30%
Debt Investments | Health Care Supplies
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments		Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 23,199
Investments, at fair value	$ 23,354
Percent of net assets	6.80%		6.80%	6.80%
Debt Investments | Heavy Electrical Equipment
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 14,045	$ 11,027
Investments, at fair value	$ 13,897	$ 11,088
Percent of net assets	4.05%	3.17%	4.05%	4.05%	3.17%
Debt Investments | Home Furnishings
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 25,404	$ 24,479
Investments, at fair value	$ 25,311	$ 24,017
Percent of net assets	7.37%	6.87%	7.37%	7.37%	6.87%
Debt Investments | Household Products
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 11,897	$ 11,637
Investments, at fair value	$ 11,414	$ 11,773
Percent of net assets	3.32%	3.36%	3.32%	3.32%	3.36%
Debt Investments | Household Appliances
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments		Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 6,040
Investments, at fair value	$ 6,003
Percent of net assets	1.75%		1.75%	1.75%
Debt Investments | Industrial Machinery
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments		Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 7,521
Investments, at fair value	$ 7,541
Percent of net assets	2.20%		2.20%	2.20%
Debt Investments | Interactive Media & Services
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 8,006	$ 18,609
Investments, at fair value	$ 7,933	$ 18,759
Percent of net assets	2.31%	5.36%	2.31%	2.31%	5.36%
Debt Investments | Internet & Direct Marketing Retail
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 37,285	$ 41,910
Investments, at fair value	$ 37,542	$ 42,440
Percent of net assets	10.95%	12.13%	10.95%	10.95%	12.13%
Debt Investments | Investment Banking & Brokerage
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 12,043	$ 12,674
Investments, at fair value	$ 12,077	$ 12,729
Percent of net assets	3.52%	3.64%	3.52%	3.52%	3.64%
Debt Investments | IT Consulting And Other Services
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 13,649	$ 17,679
Investments, at fair value	$ 13,653	$ 17,694
Percent of net assets	3.98%	5.06%	3.98%	3.98%	5.06%
Debt Investments | Leisure Facilities
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 22,075	$ 22,020
Investments, at fair value	$ 21,868	$ 21,878
Percent of net assets	6.37%	6.26%	6.37%	6.37%	6.26%
Debt Investments | Leisure Products
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	us-gaap-supplement:InvestmentAffiliatedIssuerMember	Non-controlled/non-affiliate company investments	us-gaap-supplement:InvestmentAffiliatedIssuerMember	us-gaap-supplement:InvestmentAffiliatedIssuerMember	Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 3,565	$ 6,115
Investments, at fair value	$ 3,509	$ 3,072
Percent of net assets	1.02%	0.88%	1.02%	1.02%	0.88%
Debt Investments | Life Sciences Tools & Services
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 4,932	$ 4,925
Investments, at fair value	$ 4,912	$ 4,925
Percent of net assets	1.43%	1.41%	1.43%	1.43%	1.41%
Debt Investments | Office Services & Supplies
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 26,109	$ 20,832
Investments, at fair value	$ 25,039	$ 20,921
Percent of net assets	7.30%	5.98%	7.30%	7.30%	5.98%
Debt Investments | Packaged Foods & Meats
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 11,175	$ 11,084
Investments, at fair value	$ 10,922	$ 10,862
Percent of net assets	3.19%	3.11%	3.19%	3.19%	3.11%
Debt Investments | Personal Products
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 13,703	$ 12,055
Investments, at fair value	$ 13,566	$ 12,260
Percent of net assets	3.96%	3.50%	3.96%	3.96%	3.50%
Debt Investments | Paper Packaging
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments		Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 8,099
Investments, at fair value	$ 8,099
Percent of net assets	2.35%		2.35%	2.35%
Debt Investments | Real Estate Operating Companies
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investments, amortized cost		$ 5,425
Investments, at fair value		$ 5,431
Percent of net assets		1.56%			1.56%
Debt Investments | Research & Consulting Services
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 22,244	$ 23,987
Investments, at fair value	$ 22,316	$ 23,822
Percent of net assets	6.50%	6.81%	6.50%	6.50%	6.81%
Debt Investments | Specialized Consumer Services
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 36,993	$ 35,322
Investments, at fair value	$ 37,096	$ 35,385
Percent of net assets	10.82%	10.11%	10.82%	10.82%	10.11%
Debt Investments | Specialized Finance
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Controlled affiliate company investments	Controlled affiliate company investments	Controlled affiliate company investments	Controlled affiliate company investments	Controlled affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 80,000	$ 60,000
Investments, at fair value	$ 80,000	$ 60,000
Percent of net assets	23.32%	17.16%	23.32%	23.32%	17.16%
Debt Investments | Systems Software
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 18,970	$ 19,018
Investments, at fair value	$ 17,525	$ 19,160
Percent of net assets	5.11%	5.48%	5.11%	5.11%	5.48%
Debt Investments | Technology Hardware, Storage & Peripherals
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 16,479	$ 22,717
Investments, at fair value	$ 16,809	$ 23,117
Percent of net assets	4.90%	6.61%	4.90%	4.90%	6.61%
Subordinated Debt [Member]
Schedule of Investments [Line Items]
Investments, amortized cost	$ 167	$ 167
Investments, at fair value	$ 167	167
Equity Investments
Schedule of Investments [Line Items]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 46,193	36,991
Investments, at fair value	$ 48,059	$ 38,159
Percent of net assets	14.03%	10.92%	14.03%	14.03%	10.92%
Equity Investments | Advertising
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 251	$ 250
Investments, at fair value	$ 219	$ 250
Percent of net assets	0.06%	0.07%	0.06%	0.06%	0.07%
Equity Investments | Air Freight & Logistics
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 1,250	$ 1,250
Investments, at fair value	$ 606	$ 1,250
Percent of net assets	0.18%	0.36%	0.18%	0.18%	0.36%
Equity Investments | Building Products
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments		Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 423
Investments, at fair value	$ 603
Percent of net assets	0.18%		0.18%	0.18%
Equity Investments | Data Processing & Outsourced Services
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 476	$ 423
Investments, at fair value	$ 2,368				$ 427
Percent of net assets	0.69%	0.12%	0.69%	0.69%	0.12%
Equity Investments | Data Processing And Outsourced Services Acquired on 120420
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investments, amortized cost		$ 476
Investments, at fair value		$ 893
Percent of net assets		0.26%			0.26%
Equity Investments | Diversified Support Services
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 333	$ 317
Investments, at fair value	$ 144	$ 158
Percent of net assets	0.04%	0.05%	0.04%	0.04%	0.05%
Equity Investments | Education Services
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 167	$ 167
Investments, at fair value	$ 118	$ 167
Percent of net assets	0.03%	0.05%	0.03%	0.03%	0.05%
Equity Investments | Environmental & Facilities Services
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 825	$ 825
Investments, at fair value	$ 661	$ 825
Percent of net assets	0.19%	0.24%	0.19%	0.19%	0.24%
Equity Investments | Health Care Facilities
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investments, amortized cost		$ 857
Investments, at fair value		$ 1,018
Percent of net assets		0.29%			0.29%
Equity Investments | Industrial Machinery
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments		Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 667
Investments, at fair value	$ 668
Percent of net assets	0.19%		0.19%	0.19%
Equity Investments | Interactive Media & Services
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 851	$ 850
Investments, at fair value	$ 2,327	$ 1,398
Percent of net assets	0.68%	0.40%	0.68%	0.68%	0.40%
Equity Investments | Internet & Direct Marketing Retail
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 1,614	$ 1,700
Investments, at fair value	$ 2,770	$ 3,228
Percent of net assets	0.81%	0.92%	0.81%	0.81%	0.92%
Equity Investments | Investment Banking & Brokerage
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	us-gaap-supplement:InvestmentAffiliatedIssuerMember	us-gaap-supplement:InvestmentAffiliatedIssuerMember	us-gaap-supplement:InvestmentAffiliatedIssuerMember	us-gaap-supplement:InvestmentAffiliatedIssuerMember	us-gaap-supplement:InvestmentAffiliatedIssuerMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 6,944	$ 6,944
Investments, at fair value	$ 6,295	$ 6,874
Percent of net assets	1.84%	1.97%	1.84%	1.84%	1.97%
Equity Investments | IT Consulting And Other Services
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 1,468	$ 1,468
Investments, at fair value	$ 1,818	$ 1,468
Percent of net assets	0.53%	0.42%	0.53%	0.53%	0.42%
Equity Investments | Leisure Facilities
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 2,734	$ 2,734
Investments, at fair value	$ 221	$ 264
Percent of net assets	0.07%	0.07%	0.07%	0.07%	0.07%
Equity Investments | Leisure Products
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	us-gaap-supplement:InvestmentAffiliatedIssuerMember		us-gaap-supplement:InvestmentAffiliatedIssuerMember	us-gaap-supplement:InvestmentAffiliatedIssuerMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 4,060
Investments, at fair value	$ 2,099
Percent of net assets	0.62%		0.62%	0.62%
Equity Investments | Other Diversified Financial Services
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 2,890	$ 2,890
Investments, at fair value	$ 3,823	$ 3,492
Percent of net assets	1.11%	1%	1.11%	1.11%	1%
Equity Investments | Paper Packaging
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments		Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 400
Investments, at fair value	$ 400
Percent of net assets	0.12%		0.12%	0.12%
Equity Investments | Specialized Consumer Services
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 840	$ 840
Investments, at fair value	$ 853	$ 840
Percent of net assets	0.26%	0.24%	0.26%	0.26%	0.24%
Equity Investments | Specialized Finance
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Controlled affiliate company investments	Controlled affiliate company investments	Controlled affiliate company investments	Controlled affiliate company investments	Controlled affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 20,000	$ 15,000
Investments, at fair value	$ 22,066	$ 15,607
Percent of net assets	6.43%	4.46%	6.43%	6.43%	4.46%
Non-controlled/non-affiliate company investments
Schedule of Investments [Line Items]
Investments, at fair value	$ 650,585	$ 736,727
Investment, Identifier [Axis]: ABB/Con-cise Optical Group LLC First Lien Secured Revolving Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments		Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:ABBCon-ciseOpticalGroupLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember		whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Health Care Supplies		Health Care Supplies	Health Care Supplies
Investment, Variable Interest Rate, Type [Extensible Enumeration]	us-gaap:BaseRateMember		us-gaap:BaseRateMember	us-gaap:BaseRateMember
Floor	0.75%		0.75%	0.75%
Spread Above Index	6.51%		6.51%	6.51%
Interest Rate	12.72%		12.72%	12.72%
Acquisition Date	Feb. 23, 2022
Maturity Date	Feb. 23, 2028		Feb. 23, 2028	Feb. 23, 2028
Investments, amortized cost	$ 2,058
Investments, at fair value	$ 2,073
Percent of net assets	0.60%		0.60%	0.60%
Principal/Share Amount	$ 2,106
Investment, Restriction Status [true false]	true		true	true
Investment, Significant Unobservable Input [true false]	true		true	true
Investment, Identifier [Axis]: ABB/Con-cise Optical Group LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments		Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:ABBCon-ciseOpticalGroupLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Health Care Supplies		Health Care Supplies	Health Care Supplies
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]		London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	0.75%		0.75%	0.75%
Spread Above Index	7.50%		7.50%	7.50%
Interest Rate	10.46%		10.46%	10.46%
Acquisition Date	Feb. 23, 2022
Maturity Date	Feb. 23, 2028		Feb. 23, 2028	Feb. 23, 2028
Investments, amortized cost	$ 21,141
Investments, at fair value	$ 21,281
Percent of net assets	6.20%		6.20%	6.20%
Principal/Share Amount	$ 21,627
Investment, Restriction Status [true false]	true		true	true
Investment, Significant Unobservable Input [true false]	true		true	true
Investment, Identifier [Axis]: ALM Media, LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:ALMMediaLLCMember	whf:ALMMediaLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Research & Consulting Services	Research & Consulting Services	Research & Consulting Services	Research & Consulting Services	Research & Consulting Services
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Floor	1%	1%	1%	1%	1%
Spread Above Index	6.50%	7%	6.50%	6.50%	7%
Interest Rate	9.31%	8%	9.31%	9.31%	8%
Acquisition Date	Nov. 25, 2019	Nov. 25, 2019
Maturity Date	Nov. 25, 2024	Nov. 25, 2024	Nov. 25, 2024	Nov. 25, 2024	Nov. 25, 2024
Investments, amortized cost	$ 13,467	$ 14,011
Investments, at fair value	$ 13,458	$ 13,996
Percent of net assets	3.92%	4%	3.92%	3.92%	4%
Principal/Share Amount	$ 13,584	$ 14,175
PIK interest rate		1%			1%
Investment, interest rate, paid in cash		10.25%			10.25%
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: AST Applications Software Technology LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]		whf:ASTApplicationsSoftwareTechnologyLLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		IT Consulting And Other Services			IT Consulting And Other Services
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Floor		1%			1%
Spread Above Index		8%			8%
Interest Rate		9%			9%
Acquisition Date		Jan. 10, 2017
Maturity Date		Jan. 10, 2023			Jan. 10, 2023
Investments, amortized cost		$ 3,943
Investments, at fair value		$ 3,958
Percent of net assets		1.13%			1.13%
Principal/Share Amount		$ 3,958
PIK interest rate		1%			1%
Investment, interest rate, paid in cash		8%			8%
Investment, Restriction Status [true false]		true			true
Investment, Significant Unobservable Input [true false]		true			true
Investment, Identifier [Axis]: ATSG Inc First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:ATSGIncMember	whf:ATSGIncMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	IT Consulting And Other Services	IT Consulting And Other Services	IT Consulting And Other Services	IT Consulting And Other Services	IT Consulting And Other Services
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1%	1%	1%	1%	1%
Spread Above Index	6.50%	6.50%	6.50%	6.50%	6.50%
Interest Rate	9.42%	7.50%	9.42%	9.42%	7.50%
Acquisition Date	Nov. 12, 2021	Nov. 12, 2021
Maturity Date	Nov. 12, 2026	Nov. 12, 2026	Nov. 12, 2026	Nov. 12, 2026	Nov. 12, 2026
Investments, amortized cost	$ 13,649	$ 13,736
Investments, at fair value	$ 13,653	$ 13,736
Percent of net assets	3.98%	3.93%	3.98%	3.98%	3.93%
Principal/Share Amount	$ 13,877	$ 14,008
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: Access USA Shipping, LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:AccessUSAShippingLLCMember	whf:AccessUSAShippingLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Air Freight & Logistics	Air Freight & Logistics	Air Freight & Logistics	Air Freight & Logistics	Air Freight & Logistics
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1.50%	1.50%	1.50%	1.50%	1.50%
Spread Above Index	8%	8%	8%	8%	8%
Interest Rate	11.12%	9.50%	11.12%	11.12%	9.50%
Acquisition Date	Feb. 08, 2019	Feb. 08, 2019
Maturity Date	Feb. 08, 2024	Feb. 08, 2024	Feb. 08, 2024	Feb. 08, 2024	Feb. 08, 2024
Investments, amortized cost	$ 4,699	$ 4,906
Investments, at fair value	$ 4,718	$ 4,937
Percent of net assets	1.38%	1.41%	1.38%	1.38%	1.41%
Principal/Share Amount	$ 4,718	$ 4,937
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: Aeyon LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments		Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:AeyonLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Research & Consulting Services		Research & Consulting Services	Research & Consulting Services
Investment, Variable Interest Rate, Type [Extensible Enumeration]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]		Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
Floor	1%		1%	1%
Spread Above Index	8.88%		8.88%	8.88%
Interest Rate	11.62%		11.62%	11.62%
Acquisition Date	Feb. 10, 2022
Maturity Date	Feb. 10, 2027		Feb. 10, 2027	Feb. 10, 2027
Investments, amortized cost	$ 8,777
Investments, at fair value	$ 8,858
Percent of net assets	2.58%		2.58%	2.58%
Principal/Share Amount	$ 8,933
Investment, Restriction Status [true false]	true		true	true
Investment, Significant Unobservable Input [true false]	true		true	true
Investment, Identifier [Axis]: American Crafts, LC First Lien Secured Delayed Draw Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments		Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:AmericanCraftsLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredDelayedDrawLoanMember		whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Office Services & Supplies		Office Services & Supplies	Office Services & Supplies
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]		London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1%		1%	1%
Spread Above Index	8.50%		8.50%	8.50%
Interest Rate	11.62%		11.62%	11.62%
Acquisition Date	Jan. 25, 2022
Maturity Date	May 28, 2026		May 28, 2026	May 28, 2026
Investments, amortized cost	$ 1,344
Investments, at fair value	$ 1,195
Percent of net assets	0.35%		0.35%	0.35%
Principal/Share Amount	$ 1,367
Investment, Restriction Status [true false]	true		true	true
Investment, Significant Unobservable Input [true false]	true		true	true
Investment, Identifier [Axis]: American Crafts, LC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:AmericanCraftsLCMember	whf:AmericanCraftsLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Office Services & Supplies	Office Services & Supplies	Office Services & Supplies	Office Services & Supplies	Office Services & Supplies
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1%	1%	1%	1%	1%
Spread Above Index	8.50%	8.50%	8.50%	8.50%	8.50%
Interest Rate	11.62%	9.50%	11.62%	11.62%	9.50%
Acquisition Date	May 28, 2021	May 28, 2021
Maturity Date	May 28, 2026	May 28, 2026	May 28, 2026	May 28, 2026	May 28, 2026
Investments, amortized cost	$ 8,050	$ 8,325
Investments, at fair value	$ 7,114	$ 8,325
Percent of net assets	2.07%	2.38%	2.07%	2.07%	2.38%
Principal/Share Amount	$ 8,139	$ 8,434
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: Arcole Holding Corporation Shares
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	us-gaap-supplement:InvestmentAffiliatedIssuerMember	us-gaap-supplement:InvestmentAffiliatedIssuerMember	us-gaap-supplement:InvestmentAffiliatedIssuerMember	us-gaap-supplement:InvestmentAffiliatedIssuerMember	us-gaap-supplement:InvestmentAffiliatedIssuerMember
Investment, Issuer Name [Extensible Enumeration]	whf:ArcoleHoldingCorporationMember	whf:ArcoleHoldingCorporationMember
Investment, Type [Extensible Enumeration]	Common Stock [Member]	Common Stock [Member]	Common Stock [Member]	Common Stock [Member]	Common Stock [Member]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Investment Banking & Brokerage	Investment Banking & Brokerage	Investment Banking & Brokerage	Investment Banking & Brokerage	Investment Banking & Brokerage
Acquisition Date	Oct. 01, 2020	Oct. 01, 2020
Investments, amortized cost	$ 6,944	$ 6,944
Investments, at fair value	$ 6,295	$ 6,874				$ 6,448
Percent of net assets	1.84%	1.97%	1.84%	1.84%	1.97%
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Non-income Producing [true false]	false	false	false	false	false
Investment, Identifier [Axis]: Arcstor Midco, LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:ArcstorMidcoLLCMember	whf:ArcstorMidcoLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Systems Software	Systems Software	Systems Software	Systems Software	Systems Software
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1%	1%	1%	1%	1%
Spread Above Index	7%	7%	7%	7%	7%
Interest Rate	10.67%	8%	10.67%	10.67%	8%
Acquisition Date	Mar. 16, 2021	Mar. 16, 2021
Maturity Date	Mar. 16, 2027	Mar. 16, 2027	Mar. 16, 2027	Mar. 16, 2027	Mar. 16, 2027
Investments, amortized cost	$ 18,970	$ 19,018
Investments, at fair value	$ 17,525	$ 19,160
Percent of net assets	5.11%	5.48%	5.11%	5.11%	5.48%
Principal/Share Amount	$ 19,256	$ 19,354
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: Atlas Purchaser, Inc First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments		Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:AtlasPurchaserIncMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Application Software		Application Software	Application Software
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]		London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	0.75%		0.75%	0.75%
Spread Above Index	5.25%		5.25%	5.25%
Interest Rate	8.68%		8.68%	8.68%
Acquisition Date	Aug. 29, 2022
Maturity Date	May 08, 2028		May 08, 2028	May 08, 2028
Investments, amortized cost	$ 2,595
Investments, at fair value	$ 2,562
Percent of net assets	0.74%		0.74%	0.74%
Principal/Share Amount	$ 3,105
Investment, Restriction Status [true false]	true		true	true
Investment, Significant Unobservable Input [true false]	true		true	true
Investment, Identifier [Axis]: Atlas Purchaser, Inc Second Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:AtlasPurchaserIncMember	whf:AtlasPurchaserIncMember
Investment, Type [Extensible Enumeration]	whf:SecondLienSecuredTermLoanMember	whf:SecondLienSecuredTermLoanMember	whf:SecondLienSecuredTermLoanMember	whf:SecondLienSecuredTermLoanMember	whf:SecondLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Application Software	Application Software	Application Software	Application Software	Application Software
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	0.75%	0.75%	0.75%	0.75%	0.75%
Spread Above Index	9%	9%	9%	9%	9%
Interest Rate	11.19%	9.75%	11.19%	11.19%	9.75%
Acquisition Date	May 03, 2021	May 03, 2021
Maturity Date	May 07, 2029	May 07, 2029	May 07, 2029	May 07, 2029	May 07, 2029
Investments, amortized cost	$ 14,628	$ 14,586
Investments, at fair value	$ 12,197	$ 14,700
Percent of net assets	3.55%	4.20%	3.55%	3.55%	4.20%
Principal/Share Amount	$ 15,000	$ 15,000
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: Avision Holdings, LLC Class A LLC Interests
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:AvisionHoldingsLLCMember	whf:AvisionHoldingsLLCMember
Investment, Type [Extensible Enumeration]	whf:ClassALLCInterestsMember	whf:ClassALLCInterestsMember	whf:ClassALLCInterestsMember	whf:ClassALLCInterestsMember	whf:ClassALLCInterestsMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Advertising	Advertising	Advertising	Advertising	Advertising
Acquisition Date	Dec. 15, 2021	Dec. 15, 2021
Investments, amortized cost	$ 251	$ 250
Investments, at fair value	$ 219	$ 250
Percent of net assets	0.06%	0.07%	0.06%	0.06%	0.07%
Principal/Share Amount	$ 201	$ 200
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Non-income Producing [true false]	false	false	false	false	false
Investment, Identifier [Axis]: BBQ Buyer, LLC First Lien Secured Delayed Draw Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:BBQBuyerLLCMember	whf:BBQBuyerLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Internet & Direct Marketing Retail	Internet & Direct Marketing Retail	Internet & Direct Marketing Retail	Internet & Direct Marketing Retail	Internet & Direct Marketing Retail
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1.50%	1.50%	1.50%	1.50%	1.50%
Spread Above Index	10%	10%	10%	10%	10%
Interest Rate	13.12%	11.50%	13.12%	13.12%	11.50%
Acquisition Date	Apr. 29, 2022	Dec. 02, 2021
Maturity Date	Aug. 28, 2025	Aug. 28, 2025	Aug. 28, 2025	Aug. 28, 2025	Aug. 28, 2025
Investments, amortized cost	$ 2,553	$ 2,523
Investments, at fair value	$ 2,559	$ 2,523
Percent of net assets	0.75%	0.72%	0.75%	0.75%	0.72%
Principal/Share Amount	$ 2,593	$ 2,573
PIK interest rate	2%	2%	2%	2%	2%
Investment, interest rate, paid in cash	11.12%	9.50%	11.12%	11.12%	9.50%
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: BBQ Buyer, LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:BBQBuyerLLCMember	whf:BBQBuyerLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Internet & Direct Marketing Retail	Internet & Direct Marketing Retail	Internet & Direct Marketing Retail	Internet & Direct Marketing Retail	Internet & Direct Marketing Retail
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1.50%	1.50%	1.50%	1.50%	1.50%
Spread Above Index	10%	10%	10%	10%	10%
Interest Rate	13.12%	11.50%	13.12%	13.12%	11.50%
Acquisition Date	Aug. 28, 2020	Aug. 28, 2020
Maturity Date	Aug. 28, 2025	Aug. 28, 2025	Aug. 28, 2025	Aug. 28, 2025	Aug. 28, 2025
Investments, amortized cost	$ 12,533	$ 12,388
Investments, at fair value	$ 12,616	$ 12,623
Percent of net assets	3.68%	3.61%	3.68%	3.68%	3.61%
Principal/Share Amount	$ 12,719	$ 12,623
PIK interest rate	2%	2%	2%	2%	2%
Investment, interest rate, paid in cash	11.12%	9.50%	11.12%	11.12%	9.50%
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: BBQ Buyer, LLC Shares
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:BBQBuyerLLCMember	whf:BBQBuyerLLCMember
Investment, Type [Extensible Enumeration]	Common Stock [Member]	Common Stock [Member]	Common Stock [Member]	Common Stock [Member]	Common Stock [Member]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Internet & Direct Marketing Retail	Internet & Direct Marketing Retail	Internet & Direct Marketing Retail	Internet & Direct Marketing Retail	Internet & Direct Marketing Retail
Acquisition Date	Aug. 28, 2020	Aug. 28, 2020
Investments, amortized cost	$ 1,100	$ 1,100
Investments, at fair value	$ 1,954	$ 2,442
Percent of net assets	0.57%	0.70%	0.57%	0.57%	0.70%
Principal/Share Amount	$ 1,100	$ 1,100
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Non-income Producing [true false]	false	false	false	false	false
Investment, Identifier [Axis]: BL Products Parent, LP Class A Units
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments		Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:BLProductsParentLPMember
Investment, Type [Extensible Enumeration]	whf:ClassAUnitsMember		whf:ClassAUnitsMember	whf:ClassAUnitsMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Industrial Machinery		Industrial Machinery	Industrial Machinery
Acquisition Date	Feb. 01, 2022
Investments, amortized cost	$ 667
Investments, at fair value	$ 668
Percent of net assets	0.19%		0.19%	0.19%
Principal/Share Amount	$ 667
Investment, Restriction Status [true false]	true		true	true
Investment, Significant Unobservable Input [true false]	true		true	true
Investment, Non-income Producing [true false]	false		false	false
Investment, Identifier [Axis]: BLP Buyer, Inc., First Lien Secured Revolving Loan, Floor 1.00%, Spread L plus 6.25%, Rate 7.44%, Due 2/1/27
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:BLProductsParentLPMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember		whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Industrial Machinery		Industrial Machinery	Industrial Machinery
Floor	1%		1%	1%
Spread Above Index	6.25%		6.25%	6.25%
Interest Rate	9%		9%	9%
Acquisition Date	Feb. 18, 2022
Maturity Date	Feb. 01, 2027		Feb. 01, 2027	Feb. 01, 2027
Investments, amortized cost	$ 269
Investments, at fair value	271
Principal/Share Amount	$ 274
Investment, Identifier [Axis]: BLP Buyer, Inc., First Lien Secured Revolving Loan, Floor 1.00%, Spread L plus 6.25%, Rate 7.54%, Due 2/1/27
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:BLProductsParentLPMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Industrial Machinery		Industrial Machinery	Industrial Machinery
Floor	1%		1%	1%
Spread Above Index	6.25%		6.25%	6.25%
Interest Rate	9.03%		9.03%	9.03%
Acquisition Date	Feb. 18, 2022
Maturity Date	Feb. 01, 2027		Feb. 01, 2027	Feb. 01, 2027
Investments, amortized cost	$ 8,066
Investments, at fair value	8,080
Principal/Share Amount	$ 8,209
Investment, Identifier [Axis]: BPII-JL Group Holdings LP Class A Units
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:BPII-JLGroupHoldingsLPMember	whf:BPII-JLGroupHoldingsLPMember
Investment, Type [Extensible Enumeration]	whf:ClassAUnitsMember	whf:ClassAUnitsMember	whf:ClassAUnitsMember	whf:ClassAUnitsMember	whf:ClassAUnitsMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Environmental & Facilities Services	Environmental & Facilities Services	Environmental & Facilities Services	Environmental & Facilities Services	Environmental & Facilities Services
Acquisition Date	Dec. 29, 2021	Dec. 29, 2021
Investments, amortized cost	$ 825	$ 825
Investments, at fair value	$ 661	$ 825
Percent of net assets	0.19%	0.24%	0.19%	0.19%	0.24%
Principal/Share Amount	$ 83	$ 83
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Non-income Producing [true false]	false	false	false	false	false
Investment, Identifier [Axis]: Bridgepoint Healthcare, LLC First Lien Secured Delayed Draw Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:BridgepointHealthcareLLCMember	whf:BridgepointHealthcareLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Health Care Facilities	Health Care Facilities	Health Care Facilities	Health Care Facilities	Health Care Facilities
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1%	1%	1%	1%	1%
Spread Above Index	7.75%	7.75%	7.75%	7.75%	7.75%
Interest Rate	10.51%	8.75%	10.51%	10.51%	8.75%
Acquisition Date	Oct. 05, 2021	Oct. 05, 2021
Maturity Date	Oct. 05, 2026	Oct. 05, 2026	Oct. 05, 2026	Oct. 05, 2026	Oct. 05, 2026
Investments, at fair value	$ (11)
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: Bridgepoint Healthcare, LLC First Lien Secured Revolving Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:BridgepointHealthcareLLCMember	whf:BridgepointHealthcareLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Health Care Facilities	Health Care Facilities	Health Care Facilities	Health Care Facilities	Health Care Facilities
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1%	1%	1%	1%	1%
Spread Above Index	7.75%	7.75%	7.75%	7.75%	7.75%
Interest Rate	10.51%	8.75%	10.51%	10.51%	8.75%
Acquisition Date	Oct. 05, 2021	Oct. 05, 2021
Maturity Date	Oct. 05, 2026	Oct. 05, 2026	Oct. 05, 2026	Oct. 05, 2026	Oct. 05, 2026
Investments, at fair value	$ (8)
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: Bridgepoint Healthcare, LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:BridgepointHealthcareLLCMember	whf:BridgepointHealthcareLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Health Care Facilities	Health Care Facilities	Health Care Facilities	Health Care Facilities	Health Care Facilities
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1%	1%	1%	1%	1%
Spread Above Index	7.75%	7.75%	7.75%	7.75%	7.75%
Interest Rate	10.51%	8.75%	10.51%	10.51%	8.75%
Acquisition Date	Oct. 05, 2021	Oct. 05, 2021
Maturity Date	Oct. 05, 2026	Oct. 05, 2026	Oct. 05, 2026	Oct. 05, 2026	Oct. 05, 2026
Investments, amortized cost	$ 10,392	$ 10,770
Investments, at fair value	$ 10,337	$ 10,769
Percent of net assets	3.01%	3.08%	3.01%	3.01%	3.08%
Principal/Share Amount	$ 10,562	$ 10,979
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: Bulk Midco, LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:BulkMidcoLLCMember	whf:BulkMidcoLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Cable & Satellite	Cable & Satellite	Cable & Satellite	Cable & Satellite	Cable & Satellite
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Floor	1%	1%	1%	1%	1%
Spread Above Index	5.25%	7.24%	5.25%	5.25%	7.24%
Interest Rate	11.50%	8.24%	11.50%	11.50%	8.24%
Acquisition Date	Jun. 08, 2018	Jun. 08, 2018
Maturity Date	Jun. 08, 2023	Jun. 08, 2023	Jun. 08, 2023	Jun. 08, 2023	Jun. 08, 2023
Investments, amortized cost	$ 14,891	$ 14,936
Investments, at fair value	$ 14,323	$ 14,526
Percent of net assets	4.18%	4.15%	4.18%	4.18%	4.15%
Principal/Share Amount	$ 14,922	$ 15,000
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Additional interest for senior term debt	2.75%
Investment, Identifier [Axis]: CHS Therapy, LLC First Lien Secured Term Loan A
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:CHSTherapyLLCMember	whf:CHSTherapyLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanAMember	whf:FirstLienSecuredTermLoanAMember	whf:FirstLienSecuredTermLoanAMember	whf:FirstLienSecuredTermLoanAMember	whf:FirstLienSecuredTermLoanAMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Health Care Services	Health Care Services	Health Care Services	Health Care Services	Health Care Services
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1.50%	1.50%	1.50%	1.50%	1.50%
Spread Above Index	9%	9%	9%	9%	9%
Interest Rate	12.67%	10.50%	12.67%	12.67%	10.50%
Acquisition Date	Jun. 14, 2019	Jun. 14, 2019
Maturity Date	Jun. 14, 2024	Jun. 14, 2024	Jun. 14, 2024	Jun. 14, 2024	Jun. 14, 2024
Investments, amortized cost	$ 7,079	$ 7,175
Investments, at fair value	$ 7,125	$ 7,242
Percent of net assets	2.08%	2.07%	2.08%	2.08%	2.07%
Principal/Share Amount	$ 7,125	$ 7,242
PIK interest rate	0.50%	0.50%	0.50%	0.50%	0.50%
Investment, interest rate, paid in cash	12.17%	10%	12.17%	12.17%	10%
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: CHS Therapy, LLC First Lien Secured Term Loan C
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:CHSTherapyLLCMember	whf:CHSTherapyLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanCMember	whf:FirstLienSecuredTermLoanCMember	whf:FirstLienSecuredTermLoanCMember	whf:FirstLienSecuredTermLoanCMember	whf:FirstLienSecuredTermLoanCMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Health Care Services	Health Care Services	Health Care Services	Health Care Services	Health Care Services
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1.50%	1.50%	1.50%	1.50%	1.50%
Spread Above Index	9%	9%	9%	9%	9%
Interest Rate	12.67%	10.50%	12.67%	12.67%	10.50%
Acquisition Date	Oct. 07, 2020	Oct. 07, 2020
Maturity Date	Jun. 14, 2024	Jun. 14, 2024	Jun. 14, 2024	Jun. 14, 2024	Jun. 14, 2024
Investments, amortized cost	$ 869	$ 879
Investments, at fair value	$ 877	$ 891
Percent of net assets	0.26%	0.25%	0.26%	0.26%	0.25%
Principal/Share Amount	$ 877	$ 891
PIK interest rate	0.50%	0.50%	0.50%	0.50%	0.50%
Investment, interest rate, paid in cash	12.17%	10%	12.17%	12.17%	10%
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: CX Holdco LLC Common Units
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:CXHoldcoLLCMember	whf:CXHoldcoLLCMember
Investment, Type [Extensible Enumeration]	whf:CommonUnitsMember	whf:CommonUnitsMember	whf:CommonUnitsMember	whf:CommonUnitsMember	whf:CommonUnitsMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	IT Consulting And Other Services	IT Consulting And Other Services	IT Consulting And Other Services	IT Consulting And Other Services	IT Consulting And Other Services
Acquisition Date	May 04, 2021	May 04, 2021
Investments, amortized cost	$ 972	$ 972
Investments, at fair value	$ 1,457	$ 972
Percent of net assets	0.42%	0.28%	0.42%	0.42%	0.28%
Principal/Share Amount	$ 972	$ 972
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Non-income Producing [true false]	false	false	false	false	false
Investment, Identifier [Axis]: Camp Facility Services Holdings, LLC First Lien Secured Delayed Draw Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:CampFacilityServicesHoldingsLLCMember	whf:CampFacilityServicesHoldingsLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Specialized Consumer Services	Specialized Consumer Services	Specialized Consumer Services	Specialized Consumer Services	Specialized Consumer Services
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1%	1%	1%	1%	1%
Spread Above Index	6.50%	6.50%	6.50%	6.50%	6.50%
Interest Rate	9.55%	7.50%	9.55%	9.55%	7.50%
Acquisition Date	Nov. 16, 2021	Nov. 16, 2021
Maturity Date	Nov. 16, 2027	Nov. 16, 2027	Nov. 16, 2027	Nov. 16, 2027	Nov. 16, 2027
Investments, at fair value	$ (24)	$ (1)
Percent of net assets	(0.01%)		(0.01%)	(0.01%)
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: Camp Facility Services Holdings, LLC First Lien Secured Revolving Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]		whf:CampFacilityServicesHoldingsLLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredRevolvingLoanMember			whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Specialized Consumer Services			Specialized Consumer Services
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Floor		1%			1%
Spread Above Index		6.50%			6.50%
Interest Rate		7.50%			7.50%
Acquisition Date		Nov. 16, 2021
Maturity Date		Nov. 16, 2027			Nov. 16, 2027
Investment, Restriction Status [true false]		true			true
Investment, Significant Unobservable Input [true false]		true			true
Investment, Identifier [Axis]: Camp Facility Services Holdings, LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:CampFacilityServicesHoldingsLLCMember	whf:CampFacilityServicesHoldingsLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Specialized Consumer Services	Specialized Consumer Services	Specialized Consumer Services	Specialized Consumer Services	Specialized Consumer Services
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1%	1%	1%	1%	1%
Spread Above Index	6.50%	6.50%	6.50%	6.50%	6.50%
Interest Rate	9.55%	7.50%	9.55%	9.55%	7.50%
Acquisition Date	Nov. 16, 2021	Nov. 16, 2021
Maturity Date	Nov. 16, 2027	Nov. 16, 2027	Nov. 16, 2027	Nov. 16, 2027	Nov. 16, 2027
Investments, amortized cost	$ 11,628	$ 12,745
Investments, at fair value	$ 11,558	$ 12,742
Percent of net assets	3.37%	3.64%	3.37%	3.37%	3.64%
Principal/Share Amount	$ 11,830	$ 13,000
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: Camp Facility Services Parent, LLC Preferred Units
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:CampFacilityServicesParentLLCMember	whf:CampFacilityServicesParentLLCMember
Investment, Type [Extensible Enumeration]	whf:PreferredUnitsMember	whf:PreferredUnitsMember	whf:PreferredUnitsMember	whf:PreferredUnitsMember	whf:PreferredUnitsMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Specialized Consumer Services	Specialized Consumer Services	Specialized Consumer Services	Specialized Consumer Services	Specialized Consumer Services
Spread Above Index	10%	10%	10%	10%	10%
Acquisition Date	Nov. 16, 2021	Nov. 16, 2021
Investments, amortized cost	$ 840	$ 840
Investments, at fair value	$ 853	$ 840
Percent of net assets	0.26%	0.24%	0.26%	0.26%	0.24%
Principal/Share Amount	$ 15	$ 15
PIK interest rate	10%	10%	10%	10%	10%
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Non-income Producing [true false]	false	true	false	false	true
Investment, Identifier [Axis]: Cennox Holdings Limited, First Lien Secured Term Loan, Floor 1.00%, Spread L plus 6.00%, Rate 7.00%, Due 5/4/2026
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:CennoxHoldingsLimitedMember	whf:CennoxHoldingsLimitedMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	IT Consulting And Other Services	IT Consulting And Other Services	IT Consulting And Other Services	IT Consulting And Other Services	IT Consulting And Other Services
Floor	1%	1%	1%	1%	1%
Spread Above Index	6%	6%	6%	6%	6%
Interest Rate	7.69%	7%	7.69%	7.69%	7%
Acquisition Date	Jul. 16, 2021	Jul. 16, 2021
Maturity Date	May 04, 2026	May 04, 2026	May 04, 2026	May 04, 2026	May 04, 2026
Investments, amortized cost	$ 3,868	$ 3,889
Investments, at fair value	3,140	3,877
Principal/Share Amount	$ 2,844	$ 2,866
Investment, Identifier [Axis]: Cennox Holdings Limited, First lien Secured Revolving Loan, Floor 1.00%, Spread L plus 6.00%, Rate 7.00%, Due 5/4/2026
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:CennoxHoldingsLimitedMember	whf:CennoxHoldingsLimitedMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	IT Consulting And Other Services	IT Consulting And Other Services	IT Consulting And Other Services	IT Consulting And Other Services	IT Consulting And Other Services
Floor	1%	1%	1%	1%	1%
Spread Above Index	6.25%	6%	6.25%	6.25%	6%
Interest Rate	9.78%	7%	9.78%	9.78%	7%
Acquisition Date	Jun. 28, 2022	Jul. 16, 2021
Maturity Date	May 04, 2026	May 04, 2026	May 04, 2026	May 04, 2026	May 04, 2026
Investments, amortized cost	$ 9,845	$ 1,173
Investments, at fair value	9,205	1,169
Principal/Share Amount	$ 9,482	$ 864
Investment, Identifier [Axis]: Cennox, Inc., First Lien Secured Delayed Draw Loan, Floor 1.00%, Spread L plus 6.00%, Rate 7.00%, Due 5/4/2026
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]		whf:CennoxInc.Member
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredDelayedDrawLoanMember			whf:FirstLienSecuredDelayedDrawLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		IT Consulting And Other Services			IT Consulting And Other Services
Floor		1%			1%
Spread Above Index		6%			6%
Interest Rate		7%			7%
Acquisition Date		Jun. 28, 2021
Maturity Date		May 04, 2026			May 04, 2026
Investments, amortized cost		$ 8,755
Investments, at fair value		8,915
Principal/Share Amount		$ 8,915
Investment, Identifier [Axis]: Cennox, Inc., First Lien Secured Revolving Loan, Floor 1.00%, Spread L plus 6.00%, Rate 7.00%, Due 5/4/2026
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:CennoxHoldingsLimitedMember	whf:CennoxInc.Member
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	IT Consulting And Other Services	IT Consulting And Other Services	IT Consulting And Other Services	IT Consulting And Other Services	IT Consulting And Other Services
Floor	1%	1%	1%	1%	1%
Spread Above Index	6%	6%	6%	6%	6%
Interest Rate	8.03%	7%	8.03%	8.03%	7%
Acquisition Date	Jul. 16, 2021	Jun. 28, 2021
Maturity Date	May 04, 2026	May 04, 2026	May 04, 2026	May 04, 2026	May 04, 2026
Investments, amortized cost	$ 680	$ 551
Investments, at fair value	502	569
Principal/Share Amount	$ 450	$ 561
Investment, Identifier [Axis]: Cennox, Inc., First Lien Secured Term Loan, Floor 1.00%, Spread L plus 6.00%, Rate 7.00%, Due 5/4/2026
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]		whf:CennoxInc.Member
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		IT Consulting And Other Services			IT Consulting And Other Services
Floor		1%			1%
Spread Above Index		6%			6%
Interest Rate		7%			7%
Acquisition Date		Jun. 28, 2021
Maturity Date		May 04, 2026			May 04, 2026
Investments, amortized cost		$ 8,365
Investments, at fair value		8,438
Principal/Share Amount		$ 8,525
Investment, Identifier [Axis]: Claridge Products and Equipment, LLC First Lien Secured Revolving Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:ClaridgeProductsandEquipmentLLCMember	whf:ClaridgeProductsandEquipmentLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Construction Materials	Construction Materials	Construction Materials	Construction Materials	Construction Materials
Investment, Variable Interest Rate, Type [Extensible Enumeration]	us-gaap:BaseRateMember	us-gaap:PrimeRateMember	us-gaap:BaseRateMember	us-gaap:BaseRateMember	us-gaap:PrimeRateMember
Floor	1%	3.25%	1%	1%	3.25%
Spread Above Index	5.72%	5.50%	5.72%	5.72%	5.50%
Interest Rate	11.84%	8.75%	11.84%	11.84%	8.75%
Acquisition Date	Dec. 30, 2020	Dec. 30, 2020
Maturity Date	Dec. 29, 2025	Dec. 29, 2025	Dec. 29, 2025	Dec. 29, 2025	Dec. 29, 2025
Investments, amortized cost	$ 918	$ 207
Investments, at fair value	$ 888	$ 204
Percent of net assets	0.26%	0.06%	0.26%	0.26%	0.06%
Principal/Share Amount	$ 926	$ 211
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: Claridge Products and Equipment, LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:ClaridgeProductsandEquipmentLLCMember	whf:ClaridgeProductsandEquipmentLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Construction Materials	Construction Materials	Construction Materials	Construction Materials	Construction Materials
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1%	1%	1%	1%	1%
Spread Above Index	6.50%	6.50%	6.50%	6.50%	6.50%
Interest Rate	10.17%	7.50%	10.17%	10.17%	7.50%
Acquisition Date	Dec. 30, 2020	Dec. 30, 2020
Maturity Date	Dec. 29, 2025	Dec. 29, 2025	Dec. 29, 2025	Dec. 29, 2025	Dec. 29, 2025
Investments, amortized cost	$ 7,484	$ 7,518
Investments, at fair value	$ 7,280	$ 7,469
Percent of net assets	2.11%	2.14%	2.11%	2.11%	2.14%
Principal/Share Amount	$ 7,582	$ 7,640
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: CleanChoice Energy, Inc First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:CleanChoiceEnergyIncMember	whf:CleanChoiceEnergyIncMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Electric Utilities	Electric Utilities	Electric Utilities	Electric Utilities	Electric Utilities
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1%	1%	1%	1%	1%
Spread Above Index	7.25%	7.25%	7.25%	7.25%	7.25%
Interest Rate	9.76%	8.25%	9.76%	9.76%	8.25%
Acquisition Date	Oct. 12, 2021	Oct. 12, 2021
Maturity Date	Oct. 12, 2026	Oct. 12, 2026	Oct. 12, 2026	Oct. 12, 2026	Oct. 12, 2026
Investments, amortized cost	$ 10,331	$ 10,299
Investments, at fair value	$ 10,408	$ 10,296
Percent of net assets	3.03%	2.94%	3.03%	3.03%	2.94%
Principal/Share Amount	$ 10,500	$ 10,500
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: Coastal Television Broadcasting Group LLC First Lien Secured Revolving Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments		Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:CoastalTelevisionBroadcastingGroupLLCMember	whf:CoastalTelevisionBroadcastingGroupLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Broadcasting	Broadcasting	Broadcasting	Broadcasting	Broadcasting
Investment, Variable Interest Rate, Type [Extensible Enumeration]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	whf:SecuredOvernightFinancingRateMember	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	whf:SecuredOvernightFinancingRateMember
Floor	1%	1%	1%	1%	1%
Spread Above Index	6.50%	6.50%	6.50%	6.50%	6.50%
Interest Rate	9.48%	7.50%	9.48%	9.48%	7.50%
Acquisition Date	Dec. 30, 2021	Dec. 30, 2021
Maturity Date	Dec. 30, 2026	Dec. 30, 2026	Dec. 30, 2026	Dec. 30, 2026	Dec. 30, 2026
Investments, at fair value	$ (4)
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: Coastal Television Broadcasting Group LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:CoastalTelevisionBroadcastingGroupLLCMember	whf:CoastalTelevisionBroadcastingGroupLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Broadcasting	Broadcasting	Broadcasting	Broadcasting	Broadcasting
Investment, Variable Interest Rate, Type [Extensible Enumeration]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	whf:SecuredOvernightFinancingRateMember	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	whf:SecuredOvernightFinancingRateMember
Floor	1%	1%	1%	1%	1%
Spread Above Index	6.50%	6.50%	6.50%	6.50%	6.50%
Interest Rate	9.48%	7.50%	9.48%	9.48%	7.50%
Acquisition Date	Dec. 30, 2021	Dec. 30, 2021
Maturity Date	Dec. 30, 2026	Dec. 30, 2026	Dec. 30, 2026	Dec. 30, 2026	Dec. 30, 2026
Investments, amortized cost	$ 8,052	$ 8,027
Investments, at fair value	$ 7,946	$ 8,027
Percent of net assets	2.32%	2.30%	2.32%	2.32%	2.30%
Principal/Share Amount	$ 8,191	$ 8,191
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: Crown Brands LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments		Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:CrownBrandsLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Distributors		Distributors	Distributors
Investment, Variable Interest Rate, Type [Extensible Enumeration]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]		Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
Floor	1%		1%	1%
Spread Above Index	10%		10%	10%
Interest Rate	12.95%		12.95%	12.95%
Acquisition Date	Apr. 22, 2022
Maturity Date	Dec. 09, 2025		Dec. 09, 2025	Dec. 09, 2025
Investments, amortized cost	$ 357
Investments, at fair value	$ 344
Percent of net assets	0.10%		0.10%	0.10%
Principal/Share Amount	$ 357
Investment, Restriction Status [true false]	true		true	true
Investment, Significant Unobservable Input [true false]	true		true	true
Investment, Identifier [Axis]: Crown Brands LLC Second Lien Secured Delayed Draw Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:CrownBrandsLLCMember	whf:CrownBrandsLLCMember
Investment, Type [Extensible Enumeration]	whf:SecondLienSecuredDelayedDrawLoanMember	whf:SecondLienSecuredDelayedDrawLoanMember	whf:SecondLienSecuredDelayedDrawLoanMember	whf:SecondLienSecuredDelayedDrawLoanMember	whf:SecondLienSecuredDelayedDrawLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Distributors	Distributors	Distributors	Distributors	Distributors
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1.50%	1.50%	1.50%	1.50%	1.50%
Spread Above Index	10.50%	10.50%	10.50%	10.50%	10.50%
Interest Rate	13.74%	12%	13.74%	13.74%	12%
Acquisition Date	Dec. 15, 2020	Dec. 15, 2020
Maturity Date	Jan. 08, 2026	Jan. 08, 2026	Jan. 08, 2026	Jan. 08, 2026	Jan. 08, 2026
Investments, amortized cost	$ 651	$ 650
Investments, at fair value	$ 423	$ 520
Percent of net assets	0.12%	0.15%	0.12%	0.12%	0.15%
Principal/Share Amount	$ 651	$ 650
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Interest Issuer May Pay In Cash Or Cash And PIK.	2%
Investment, Identifier [Axis]: Crown Brands LLC Second Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:CrownBrandsLLCMember	whf:CrownBrandsLLCMember
Investment, Type [Extensible Enumeration]	whf:SecondLienSecuredTermLoanMember	whf:SecondLienSecuredTermLoanMember	whf:SecondLienSecuredTermLoanMember	whf:SecondLienSecuredTermLoanMember	whf:SecondLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Distributors	Distributors	Distributors	Distributors	Distributors
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1.50%	1.50%	1.50%	1.50%	1.50%
Spread Above Index	10.50%	10.50%	10.50%	10.50%	10.50%
Interest Rate	13.62%	12%	13.62%	13.62%	12%
Acquisition Date	Dec. 15, 2020	Dec. 15, 2020
Maturity Date	Jan. 08, 2026	Jan. 08, 2026	Jan. 08, 2026	Jan. 08, 2026	Jan. 08, 2026
Investments, amortized cost	$ 4,318	$ 4,299
Investments, at fair value	$ 2,851	$ 3,505
Percent of net assets	0.83%	1%	0.83%	0.83%	1%
Principal/Share Amount	$ 4,386	$ 4,382
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Interest Issuer May Pay In Cash Or Cash And PIK.	2%
Investment, Identifier [Axis]: DCA Investment Holding, LLC First Lien Secured Delayed Draw Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]		whf:DCAInvestmentHoldingLLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredDelayedDrawLoanMember			whf:FirstLienSecuredDelayedDrawLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Health Care Services			Health Care Services
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Floor		0.75%			0.75%
Spread Above Index		6.25%			6.25%
Interest Rate		7%			7%
Acquisition Date		Mar. 12, 2021
Maturity Date		Mar. 12, 2027			Mar. 12, 2027
Investments, amortized cost		$ 672
Investments, at fair value		$ 688
Percent of net assets		0.20%			0.20%
Principal/Share Amount		$ 678
Investment, Restriction Status [true false]		true			true
Investment, Significant Unobservable Input [true false]		true			true
Investment, Identifier [Axis]: DCA Investment Holding, LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]		whf:DCAInvestmentHoldingLLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Health Care Services			Health Care Services
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Floor		0.75%			0.75%
Spread Above Index		6.25%			6.25%
Interest Rate		7%			7%
Acquisition Date		Mar. 12, 2021
Maturity Date		Mar. 12, 2027			Mar. 12, 2027
Investments, amortized cost		$ 6,933
Investments, at fair value		$ 6,988
Percent of net assets		2%			2%
Principal/Share Amount		$ 7,025
Investment, Restriction Status [true false]		true			true
Investment, Significant Unobservable Input [true false]		true			true
Investment, Identifier [Axis]: Drew Foam Companies Inc First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]		whf:DrewFoamCompaniesIncMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Building Products			Building Products
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Floor		1%			1%
Spread Above Index		6%			6%
Interest Rate		7%			7%
Acquisition Date		Nov. 05, 2020
Maturity Date		Nov. 05, 2025			Nov. 05, 2025
Investments, amortized cost		$ 7,094
Investments, at fair value		$ 7,183
Percent of net assets		2.05%			2.05%
Principal/Share Amount		$ 7,207
Investment, Restriction Status [true false]		true			true
Investment, Significant Unobservable Input [true false]		true			true
Investment, Identifier [Axis]: Drew Foam Companies Inc, First Lien Secured Term Loan, Floor 1.00%, Spread L plus 6.00%, Rate 7.00%, Due 11/5/2025
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:DrewFoamCompaniesIncMember	whf:DrewFoamCompaniesIncMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Building Products	Building Products	Building Products	Building Products	Building Products
Floor	1%	1%	1%	1%	1%
Spread Above Index	6%	6%	6%	6%	6%
Interest Rate	9.67%	7%	9.67%	9.67%	7%
Acquisition Date	Nov. 09, 2020	Nov. 09, 2020
Maturity Date	Nov. 05, 2025	Nov. 05, 2025	Nov. 05, 2025	Nov. 05, 2025	Nov. 05, 2025
Investments, amortized cost	$ 14,125	$ 7,096
Investments, at fair value	14,305	7,183
Principal/Share Amount	$ 14,305	$ 7,207
Investment, Identifier [Axis]: E-Phoenix Acquisition Co. Inc., First Lien Secured Term Loan, Floor 1.00%, Spread L plus 5.75%, Rate 6.75%, Due 6/23/2027
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:E-PhoenixAcquisitionCo.Inc.Member	whf:E-PhoenixAcquisitionCo.Inc.Member
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Research & Consulting Services	Research & Consulting Services	Research & Consulting Services	Research & Consulting Services	Research & Consulting Services
Floor	1%	1%	1%	1%	1%
Spread Above Index	5.75%	5.75%	5.75%	5.75%	5.75%
Interest Rate	9.42%	6.75%	9.42%	9.42%	6.75%
Acquisition Date	Jul. 15, 2021	Jul. 15, 2021
Maturity Date	Jun. 23, 2027	Jun. 23, 2027	Jun. 23, 2027	Jun. 23, 2027	Jun. 23, 2027
Investments, amortized cost	$ 8,799	$ 8,852
Investments, at fair value	8,832	8,901
Principal/Share Amount	$ 8,888	$ 8,955
Investment, Identifier [Axis]: Eddy Acquisitions, LLC Preferred Units
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:EddyAcquisitionsLLCMember	whf:EddyAcquisitionsLLCMember
Investment, Type [Extensible Enumeration]	whf:PreferredUnitsMember	whf:PreferredUnitsMember	whf:PreferredUnitsMember	whf:PreferredUnitsMember	whf:PreferredUnitsMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Education Services	Education Services	Education Services	Education Services	Education Services
Spread Above Index	12%	12%	12%	12%	12%
Interest Rate	12%	12%	12%	12%	12%
Acquisition Date	Sep. 15, 2021	Sep. 15, 2021
Investments, amortized cost	$ 167	$ 167
Investments, at fair value	$ 118	$ 167
Percent of net assets	0.03%	0.05%	0.03%	0.03%	0.05%
Principal/Share Amount	$ 167	$ 167
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Non-income Producing [true false]	false	true	false	false	true
Investment, Identifier [Axis]: Education Networks of America, Inc First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]		whf:EducationNetworksofAmericaIncMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Application Software			Application Software
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Floor		1%			1%
Spread Above Index		5.50%			5.50%
Interest Rate		6.50%			6.50%
Acquisition Date		Nov. 30, 2021
Maturity Date		Oct. 27, 2026			Oct. 27, 2026
Investments, amortized cost		$ 4,511
Investments, at fair value		$ 4,508
Percent of net assets		1.29%			1.29%
Principal/Share Amount		$ 4,719
Investment, Restriction Status [true false]		true			true
Investment, Significant Unobservable Input [true false]		true			true
Investment, Identifier [Axis]: EducationDynamics, LLC First Lien Secured Delayed Draw Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:EducationDynamicsLLCMember	whf:EducationDynamicsLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Education Services	Education Services	Education Services	Education Services	Education Services
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1%	1%	1%	1%	1%
Spread Above Index	7%	7%	7%	7%	7%
Interest Rate	10.05%	8%	10.05%	10.05%	8%
Acquisition Date	Sep. 15, 2021	Sep. 15, 2021
Maturity Date	Sep. 15, 2026	Sep. 15, 2026	Sep. 15, 2026	Sep. 15, 2026	Sep. 15, 2026
Investments, at fair value	$ (3)
PIK interest rate	0.50%	0.50%	0.50%	0.50%	0.50%
Investment, interest rate, paid in cash	9.55%	7.50%	9.55%	9.55%	7.50%
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: EducationDynamics, LLC First Lien Secured Revolving Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:EducationDynamicsLLCMember	whf:EducationDynamicsLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Education Services	Education Services	Education Services	Education Services	Education Services
Investment, Variable Interest Rate, Type [Extensible Enumeration]	us-gaap:PrimeRateMember	London Interbank Offered Rate (LIBOR) [Member]	us-gaap:PrimeRateMember	us-gaap:PrimeRateMember	London Interbank Offered Rate (LIBOR) [Member]
Floor	1%	1%	1%	1%	1%
Spread Above Index	5.50%	7%	5.50%	5.50%	7%
Interest Rate	11.75%	8%	11.75%	11.75%	8%
Acquisition Date	Sep. 15, 2021	Sep. 15, 2021
Maturity Date	Sep. 15, 2026	Sep. 15, 2026	Sep. 15, 2026	Sep. 15, 2026	Sep. 15, 2026
Investments, amortized cost	$ 236
Investments, at fair value	$ 234
Percent of net assets	0.07%		0.07%	0.07%
Principal/Share Amount	$ 240
PIK interest rate		0.50%			0.50%
Investment, interest rate, paid in cash		7.50%			7.50%
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: EducationDynamics, LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:EducationDynamicsLLCMember	whf:EducationDynamicsLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Education Services	Education Services	Education Services	Education Services	Education Services
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1%	1%	1%	1%	1%
Spread Above Index	7%	7%	7%	7%	7%
Interest Rate	10.05%	8%	10.05%	10.05%	8%
Acquisition Date	Sep. 15, 2021	Sep. 15, 2021
Maturity Date	Sep. 15, 2026	Sep. 15, 2026	Sep. 15, 2026	Sep. 15, 2026	Sep. 15, 2026
Investments, amortized cost	$ 12,912	$ 13,068
Investments, at fair value	$ 12,887	$ 13,064
Percent of net assets	3.75%	3.74%	3.75%	3.75%	3.74%
Principal/Share Amount	$ 13,119	$ 13,318
PIK interest rate	0.50%	0.50%	0.50%	0.50%	0.50%
Investment, interest rate, paid in cash	9.55%	7.50%	9.55%	9.55%	7.50%
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: EducationDynamics, LLC Subordinated Unsecured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:EducationDynamicsLLCMember	whf:EducationDynamicsLLCMember
Investment, Type [Extensible Enumeration]	whf:SubordinatedUnsecuredTermLoanMember	whf:SubordinatedUnsecuredTermLoanMember	whf:SubordinatedUnsecuredTermLoanMember	whf:SubordinatedUnsecuredTermLoanMember	whf:SubordinatedUnsecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Education Services	Education Services	Education Services	Education Services	Education Services
Spread Above Index	4%	4%	4%	4%	4%
Interest Rate	4%	4%	4%	4%	4%
Acquisition Date	Sep. 15, 2021	Sep. 15, 2021
Maturity Date	Mar. 15, 2027	Mar. 15, 2027	Mar. 15, 2027	Mar. 15, 2027	Mar. 15, 2027
Investments, amortized cost	$ 167	$ 167
Investments, at fair value	$ 167	$ 167
Percent of net assets	0.05%	0.05%	0.05%	0.05%	0.05%
Principal/Share Amount	$ 167	$ 167
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: Empire Office, Inc First Lien Secured Delayed Draw Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:EmpireOfficeIncMember	whf:EmpireOfficeIncMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Office Services & Supplies	Office Services & Supplies	Office Services & Supplies	Office Services & Supplies	Office Services & Supplies
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1.50%	1.50%	1.50%	1.50%	1.50%
Spread Above Index	6.50%	6.75%	6.50%	6.50%	6.75%
Interest Rate	9.62%	8.25%	9.62%	9.62%	8.25%
Acquisition Date	Aug. 17, 2021	Aug. 17, 2021
Maturity Date	Apr. 12, 2024	Apr. 12, 2024	Apr. 12, 2024	Apr. 12, 2024	Apr. 12, 2024
Investments, amortized cost	$ 4,792
Investments, at fair value	$ 4,820	$ 7
Percent of net assets	1.41%		1.41%	1.41%
Principal/Share Amount	$ 4,864
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: Empire Office, Inc First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:EmpireOfficeIncMember	whf:EmpireOfficeIncMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Office Services & Supplies	Office Services & Supplies	Office Services & Supplies	Office Services & Supplies	Office Services & Supplies
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1.50%	1.50%	1.50%	1.50%	1.50%
Spread Above Index	6.50%	6.75%	6.50%	6.50%	6.75%
Interest Rate	9.62%	8.25%	9.62%	9.62%	8.25%
Acquisition Date	Apr. 12, 2019	Apr. 12, 2019
Maturity Date	Apr. 12, 2024	Apr. 12, 2024	Apr. 12, 2024	Apr. 12, 2024	Apr. 12, 2024
Investments, amortized cost	$ 11,923	$ 12,507
Investments, at fair value	$ 11,910	$ 12,589
Percent of net assets	3.47%	3.60%	3.47%	3.47%	3.60%
Principal/Share Amount	$ 12,019	$ 12,656
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: Epiphany Business Services, LLC First Lien Secured Delayed Draw Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]		whf:EpiphanyBusinessServicesLLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredDelayedDrawLoanMember			whf:FirstLienSecuredDelayedDrawLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Health Care Facilities			Health Care Facilities
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Floor		1%			1%
Spread Above Index		7.50%			7.50%
Interest Rate		8.50%			8.50%
Acquisition Date		Dec. 04, 2020
Maturity Date		Jun. 22, 2023			Jun. 22, 2023
Investments, amortized cost		$ 3,008
Investments, at fair value		$ 3,027
Percent of net assets		0.87%			0.87%
Principal/Share Amount		$ 3,052
Investment, Restriction Status [true false]		true			true
Investment, Significant Unobservable Input [true false]		true			true
Investment, Identifier [Axis]: Epiphany Business Services, LLC First Lien Secured Revolving Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]		whf:EpiphanyBusinessServicesLLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredRevolvingLoanMember			whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Health Care Facilities			Health Care Facilities
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Floor		1%			1%
Spread Above Index		7.50%			7.50%
Interest Rate		8.50%			8.50%
Acquisition Date		Dec. 04, 2020
Maturity Date		Jun. 22, 2023			Jun. 22, 2023
Investments, at fair value		$ 3
Investment, Restriction Status [true false]		true			true
Investment, Significant Unobservable Input [true false]		true			true
Investment, Identifier [Axis]: Epiphany Business Services, LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]		whf:EpiphanyBusinessServicesLLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Health Care Facilities			Health Care Facilities
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Floor		1%			1%
Spread Above Index		7.50%			7.50%
Interest Rate		8.50%			8.50%
Acquisition Date		Dec. 04, 2020
Maturity Date		Jun. 22, 2023			Jun. 22, 2023
Investments, amortized cost		$ 4,214
Investments, at fair value		$ 4,235
Percent of net assets		1.21%			1.21%
Principal/Share Amount		$ 4,278
Investment, Restriction Status [true false]		true			true
Investment, Significant Unobservable Input [true false]		true			true
Investment, Identifier [Axis]: Escalon Services Inc First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:EscalonServicesIncMember	whf:EscalonServicesIncMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Data Processing & Outsourced Services	Data Processing & Outsourced Services	Data Processing & Outsourced Services	Data Processing & Outsourced Services	Data Processing & Outsourced Services
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1%	1%	1%	1%	1%
Spread Above Index	10.31%	13.50%	10.31%	10.31%	13.50%
Interest Rate	13.22%	14.50%	13.22%	13.22%	14.50%
Acquisition Date	Dec. 04, 2020	Dec. 04, 2020
Maturity Date	Dec. 04, 2025	Dec. 04, 2025	Dec. 04, 2025	Dec. 04, 2025	Dec. 04, 2025
Investments, amortized cost	$ 16,599	$ 7,490
Investments, at fair value	$ 17,797	$ 8,046
Percent of net assets	5.19%	2.30%	5.19%	5.19%	2.30%
Principal/Share Amount	$ 17,278	$ 8,046
PIK interest rate	1.50%		1.50%	1.50%
Investment, interest rate, paid in cash	11.72%	13%	11.72%	11.72%	13%
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: Escalon Services Inc Warrants
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:EscalonServicesIncMember	whf:EscalonServicesIncMember
Investment, Type [Extensible Enumeration]	Warrant [Member]	Warrant [Member]	Warrant [Member]	Warrant [Member]	Warrant [Member]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Data Processing & Outsourced Services	Data Processing & Outsourced Services	Data Processing & Outsourced Services	Data Processing & Outsourced Services	Data Processing & Outsourced Services
Acquisition Date	Dec. 04, 2020	Dec. 04, 2020
Investments, amortized cost	$ 476	$ 476
Investments, at fair value	$ 2,368	$ 893
Percent of net assets	0.69%	0.26%	0.69%	0.69%	0.26%
Principal/Share Amount	$ 709	$ 709
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Non-income Producing [true false]	false	false	false	false	false
Investment, Identifier [Axis]: FR Flow Control CB LLC, First Lien Secured Term Loan B, Floor 1.00%, Spread L plus 5.50%, Rate 6.50%, Due 6/28/2026
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]		whf:FRFlowControlCBLLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredTermLoanBMember			whf:FirstLienSecuredTermLoanBMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Industrial Machinery			Industrial Machinery
Floor		1%			1%
Spread Above Index		5.50%			5.50%
Interest Rate		6.50%			6.50%
Acquisition Date		Jul. 19, 2019
Maturity Date		Jun. 28, 2026			Jun. 28, 2026
Investments, amortized cost		$ 6,727
Investments, at fair value		6,815
Principal/Share Amount		$ 6,815
Investment, Identifier [Axis]: Flexitallic Group SAS First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:FlexitallicGroupSASMember	whf:FlexitallicGroupSASMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Commodity Chemicals	Commodity Chemicals	Commodity Chemicals	Commodity Chemicals	Commodity Chemicals
Investment, Variable Interest Rate, Type [Extensible Enumeration]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	London Interbank Offered Rate (LIBOR) [Member]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1%	1%	1%	1%	1%
Spread Above Index	7.50%	7.50%	7.50%	7.50%	7.50%
Interest Rate	11.20%	8.50%	11.20%	11.20%	8.50%
Acquisition Date	Oct. 28, 2019	Oct. 28, 2019
Maturity Date	Oct. 29, 2026	Oct. 29, 2026	Oct. 29, 2026	Oct. 29, 2026	Oct. 29, 2026
Investments, amortized cost	$ 15,777	$ 15,047
Investments, at fair value	$ 16,003	$ 15,172
Percent of net assets	4.67%	4.34%	4.67%	4.67%	4.34%
Principal/Share Amount	$ 16,371	$ 15,722
PIK interest rate	0.50%	0.50%	0.50%	0.50%	0.50%
Investment, interest rate, paid in cash	10.70%	8%	10.70%	10.70%	8%
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: Future Payment Technologies, LP First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:FuturePaymentTechnologiesLPMember	whf:FuturePaymentTechnologiesLPMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Data Processing & Outsourced Services	Data Processing & Outsourced Services	Data Processing & Outsourced Services	Data Processing & Outsourced Services	Data Processing & Outsourced Services
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1%	1%	1%	1%	1%
Spread Above Index	8.25%	8.25%	8.25%	8.25%	8.25%
Interest Rate	10.81%	9.25%	10.81%	10.81%	9.25%
Acquisition Date	Dec. 23, 2016	Dec. 23, 2016
Maturity Date	Jun. 07, 2024	Jun. 07, 2024	Jun. 07, 2024	Jun. 07, 2024	Jun. 07, 2024
Investments, amortized cost	$ 23,074	$ 23,811
Investments, at fair value	$ 23,222	$ 23,925
Percent of net assets	6.77%	6.84%	6.77%	6.77%	6.84%
Principal/Share Amount	$ 23,222	$ 24,000
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: Geo Logic Systems Ltd., First Lien Secured Revolving Loan, Floor 1.00%, Spread C plus 6.50%, Rate 7.50%, Due 12/19/2024
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:GeoLogicSystemsLtdMember	whf:GeoLogicSystemsLtdMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Data Processing & Outsourced Services	Data Processing & Outsourced Services	Data Processing & Outsourced Services	Data Processing & Outsourced Services	Data Processing & Outsourced Services
Floor	1%	1%	1%	1%	1%
Spread Above Index	6.50%	6.50%	6.50%	6.50%	6.50%
Interest Rate	10.67%	7.50%	10.67%	10.67%	7.50%
Acquisition Date	Jan. 22, 2020	Jan. 22, 2020
Maturity Date	Dec. 19, 2024	Dec. 19, 2024	Dec. 19, 2024	Dec. 19, 2024	Dec. 19, 2024
Investments, at fair value	$ 2	$ 4
Investment, Identifier [Axis]: Geo Logic Systems Ltd., First Lien Secured Term Loan, Floor 1.00%, Spread C plus 6.50%, Rate 7.50%, Due 12/19/2024
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:GeoLogicSystemsLtdMember	whf:GeoLogicSystemsLtdMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Data Processing & Outsourced Services	Data Processing & Outsourced Services	Data Processing & Outsourced Services	Data Processing & Outsourced Services	Data Processing & Outsourced Services
Floor	1%	1%	1%	1%	1%
Spread Above Index	6.50%	6.50%	6.50%	6.50%	6.50%
Interest Rate	10.67%	7.50%	10.67%	10.67%	7.50%
Acquisition Date	Jan. 22, 2020	Jan. 22, 2020
Maturity Date	Dec. 19, 2024	Dec. 19, 2024	Dec. 19, 2024	Dec. 19, 2024	Dec. 19, 2024
Investments, amortized cost	$ 15,497	$ 15,766
Investments, at fair value	14,505	16,156
Principal/Share Amount	$ 20,225	$ 20,632
Investment, Identifier [Axis]: Grupo HIMA San Pablo, Inc Amended Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]		whf:GrupoHIMASanPabloIncMember
Investment, Type [Extensible Enumeration]		whf:AmendedTermLoanMember			whf:AmendedTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Health Care Facilities			Health Care Facilities
Floor		1.50%			1.50%
Spread Above Index		9%			9%
Interest Rate		10.50%			10.50%
Acquisition Date		Nov. 24, 2021
Maturity Date		Nov. 24, 2023			Nov. 24, 2023
Investments, amortized cost		$ 1,704
Investments, at fair value		$ 1,708
Percent of net assets		0.49%			0.49%
Principal/Share Amount		$ 1,708
PIK interest rate		10.50%			10.50%
Investment, interest rate, paid in cash		0%			0%
Investment, Restriction Status [true false]		true			true
Investment, Significant Unobservable Input [true false]		true			true
Investment, Identifier [Axis]: Grupo HIMA San Pablo, Inc First Lien Secured Term Loan A
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]		whf:GrupoHIMASanPabloIncMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredTermLoanAMember			whf:FirstLienSecuredTermLoanAMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Health Care Facilities			Health Care Facilities
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Spread Above Index		9%			9%
Interest Rate		9.13%			9.13%
Acquisition Date		May 05, 2019
Maturity Date		Apr. 30, 2019			Apr. 30, 2019
Investments, amortized cost		$ 3,476
Investments, at fair value		$ 1,169
Percent of net assets		0.33%			0.33%
Principal/Share Amount		$ 3,476
Investment, Restriction Status [true false]		true			true
Investment, Significant Unobservable Input [true false]		true			true
Investment, Identifier [Axis]: Grupo HIMA San Pablo, Inc First Lien Secured Term Loan B
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]		whf:GrupoHIMASanPabloIncMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredTermLoanBMember			whf:FirstLienSecuredTermLoanBMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Health Care Facilities			Health Care Facilities
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Floor		1.50%			1.50%
Spread Above Index		9%			9%
Interest Rate		10.50%			10.50%
Acquisition Date		Feb. 01, 2013
Maturity Date		Apr. 30, 2019			Apr. 30, 2019
Investments, amortized cost		$ 12,185
Investments, at fair value		$ 4,097
Percent of net assets		1.17%			1.17%
Principal/Share Amount		$ 12,185
PIK interest rate		2%			2%
Investment, interest rate, paid in cash		13.75%			13.75%
Investment, Restriction Status [true false]		true			true
Investment, Significant Unobservable Input [true false]		true			true
Investment, Identifier [Axis]: Grupo HIMA San Pablo, Inc Second Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]		whf:GrupoHIMASanPabloIncMember
Investment, Type [Extensible Enumeration]		whf:SecondLienSecuredTermLoanMember			whf:SecondLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Health Care Facilities			Health Care Facilities
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Spread Above Index		15.75%			15.75%
Interest Rate		15.75%			15.75%
Acquisition Date		Feb. 01, 2013
Maturity Date		Jul. 31, 2018			Jul. 31, 2018
Investments, amortized cost		$ 1,024
Principal/Share Amount		$ 1,028
Investment, Restriction Status [true false]		true			true
Investment, Significant Unobservable Input [true false]		true			true
Investment, Identifier [Axis]: Grupo HIMA San Pablo, Inc Superpriority Delayed Draw Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]		whf:GrupoHIMASanPabloIncMember
Investment, Type [Extensible Enumeration]		whf:SuperpriorityDelayedDrawLoanMember			whf:SuperpriorityDelayedDrawLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Health Care Facilities			Health Care Facilities
Spread Above Index		12%			12%
Interest Rate		12%			12%
Acquisition Date		Nov. 24, 2021
Maturity Date		Nov. 24, 2023			Nov. 24, 2023
Investments, amortized cost		$ 568
Investments, at fair value		$ 568
Percent of net assets		0.16%			0.16%
Principal/Share Amount		$ 568
Investment, Restriction Status [true false]		true			true
Investment, Significant Unobservable Input [true false]		true			true
Investment, Identifier [Axis]: HC Salon Holdings, Inc First Lien Secured Revolving Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:HCSalonHoldingsIncMember	whf:HCSalonHoldingsIncMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Specialized Consumer Services	Specialized Consumer Services	Specialized Consumer Services	Specialized Consumer Services	Specialized Consumer Services
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1%	1%	1%	1%	1%
Spread Above Index	8%	8%	8%	8%	8%
Interest Rate	11.67%	9%	11.67%	11.67%	9%
Acquisition Date	Sep. 30, 2021	Sep. 30, 2021
Maturity Date	Sep. 30, 2026	Sep. 30, 2026	Sep. 30, 2026	Sep. 30, 2026	Sep. 30, 2026
Investments, at fair value	$ 11
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: HC Salon Holdings, Inc First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:HCSalonHoldingsIncMember	whf:HCSalonHoldingsIncMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Specialized Consumer Services	Specialized Consumer Services	Specialized Consumer Services	Specialized Consumer Services	Specialized Consumer Services
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1%	1%	1%	1%	1%
Spread Above Index	8%	8%	8%	8%	8%
Interest Rate	11.67%	9%	11.67%	11.67%	9%
Acquisition Date	Sep. 30, 2021	Sep. 30, 2021
Maturity Date	Sep. 30, 2026	Sep. 30, 2026	Sep. 30, 2026	Sep. 30, 2026	Sep. 30, 2026
Investments, amortized cost	$ 11,365	$ 11,417
Investments, at fair value	$ 11,550	$ 11,416
Percent of net assets	3.37%	3.26%	3.37%	3.37%	3.26%
Principal/Share Amount	$ 11,550	$ 11,638
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: HRG Management, LLC First Lien Secured Delayed Draw Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]		whf:HRGManagementLLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredDelayedDrawLoanMember			whf:FirstLienSecuredDelayedDrawLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Real Estate Operating Companies			Real Estate Operating Companies
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Floor		1%			1%
Spread Above Index		6.25%			6.25%
Interest Rate		7.25%			7.25%
Acquisition Date		Oct. 19, 2021
Maturity Date		Oct. 19, 2026			Oct. 19, 2026
Investments, amortized cost		$ 644
Investments, at fair value		$ 651
Percent of net assets		0.19%			0.19%
Principal/Share Amount		$ 653
Investment, Restriction Status [true false]		true			true
Investment, Significant Unobservable Input [true false]		true			true
Investment, Identifier [Axis]: HRG Management, LLC First Lien Secured Revolving Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]		whf:HRGManagementLLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredRevolvingLoanMember			whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Real Estate Operating Companies			Real Estate Operating Companies
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Floor		1%			1%
Spread Above Index		6.25%			6.25%
Interest Rate		7.25%			7.25%
Acquisition Date		Oct. 19, 2021
Maturity Date		Oct. 19, 2026			Oct. 19, 2026
Investment, Restriction Status [true false]		true			true
Investment, Significant Unobservable Input [true false]		true			true
Investment, Identifier [Axis]: HRG Management, LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]		whf:HRGManagementLLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Real Estate Operating Companies			Real Estate Operating Companies
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Floor		1%			1%
Spread Above Index		6.25%			6.25%
Interest Rate		7.25%			7.25%
Acquisition Date		Oct. 19, 2021
Maturity Date		Oct. 19, 2026			Oct. 19, 2026
Investments, amortized cost		$ 4,781
Investments, at fair value		$ 4,780
Percent of net assets		1.37%			1.37%
Principal/Share Amount		$ 4,875
Investment, Restriction Status [true false]		true			true
Investment, Significant Unobservable Input [true false]		true			true
Investment, Identifier [Axis]: HRG Management, LLC, First Lien Secured Delayed Draw Loan, Floor 1.00%, Spread L plus 6.25%, Rate 7.29%, Due 10/19/2026
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	HRG Management, LLC HomeRiver Group, LLC [Member]
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredDelayedDrawLoanMember		whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Real Estate Operating Companies		Real Estate Operating Companies	Real Estate Operating Companies
Floor	1%		1%	1%
Spread Above Index	6.25%		6.25%	6.25%
Interest Rate	8.99%		8.99%	8.99%
Acquisition Date	Feb. 18, 2022
Maturity Date	Oct. 19, 2026		Oct. 19, 2026	Oct. 19, 2026
Investments, amortized cost	$ 1,257
Investments, at fair value	1,242
Principal/Share Amount	$ 1,273
Investment, Identifier [Axis]: HRG Management, LLC, First Lien Secured Revolving Loan, Floor 1.00%, Spread L plus 6.25%, Rate 7.29%, Due 10/19/2026
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	HRG Management, LLC HomeRiver Group, LLC [Member]
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember		whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Real Estate Operating Companies		Real Estate Operating Companies	Real Estate Operating Companies
Floor	1%		1%	1%
Spread Above Index	6.25%		6.25%	6.25%
Interest Rate	8.99%		8.99%	8.99%
Acquisition Date	Feb. 18, 2022
Maturity Date	Oct. 19, 2026		Oct. 19, 2026	Oct. 19, 2026
Investments, at fair value	$ (4)
Investment, Identifier [Axis]: HRG Management, LLC, First Lien Secured Term Loan, Floor 1.00%, Spread L plus 6.25%, Rate 7.25%, Due 10/19/2026
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]		HRG Management, LLC HomeRiver Group, LLC [Member]
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Real Estate Operating Companies			Real Estate Operating Companies
Floor		1%			1%
Spread Above Index		6.25%			6.25%
Interest Rate		7.25%			7.25%
Acquisition Date		Dec. 28, 2021
Maturity Date		Oct. 19, 2026			Oct. 19, 2026
Investments, amortized cost		$ 4,781
Investments, at fair value		4,780
Principal/Share Amount		$ 4,875
Investment, Identifier [Axis]: HRG Management, LLC, First Lien Secured Term Loan, Floor 1.00%, Spread L plus 6.25%, Rate 7.29%, Due 10/19/2026
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	HRG Management, LLC HomeRiver Group, LLC [Member]
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Real Estate Operating Companies		Real Estate Operating Companies	Real Estate Operating Companies
Floor	1%		1%	1%
Spread Above Index	6.25%		6.25%	6.25%
Interest Rate	8.99%		8.99%	8.99%
Acquisition Date	Dec. 28, 2021
Maturity Date	Oct. 19, 2026		Oct. 19, 2026	Oct. 19, 2026
Investments, amortized cost	$ 9,520
Investments, at fair value	9,484
Principal/Share Amount	$ 9,677
Investment, Identifier [Axis]: Hollander Intermediate LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments		Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:HollanderIntermediateLlcMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Home Furnishings		Home Furnishings	Home Furnishings
Investment, Variable Interest Rate, Type [Extensible Enumeration]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]		Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
Floor	2%		2%	2%
Spread Above Index	8.75%		8.75%	8.75%
Interest Rate	11.79%		11.79%	11.79%
Acquisition Date	Sep. 19, 2022
Maturity Date	Sep. 21, 2026		Sep. 21, 2026	Sep. 21, 2026
Investments, amortized cost	$ 4,849
Investments, at fair value	$ 4,671
Percent of net assets	1.36%		1.36%	1.36%
Principal/Share Amount	$ 4,891
Investment, Restriction Status [true false]	true		true	true
Investment, Significant Unobservable Input [true false]	true		true	true
Investment, Identifier [Axis]: Honors Holdings, LLC First Lien Secured Delayed Draw Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:HonorsHoldingsLLCMember	whf:HonorsHoldingsLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Leisure Facilities	Leisure Facilities	Leisure Facilities	Leisure Facilities	Leisure Facilities
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1%	1%	1%	1%	1%
Spread Above Index	7.46%	7.58%	7.46%	7.46%	7.58%
Interest Rate	10.80%	8.58%	10.80%	10.80%	8.58%
Acquisition Date	Sep. 06, 2019	Sep. 06, 2019
Maturity Date	Sep. 06, 2024	Sep. 06, 2024	Sep. 06, 2024	Sep. 06, 2024	Sep. 06, 2024
Investments, amortized cost	$ 4,618	$ 4,611
Investments, at fair value	$ 4,603	$ 4,578
Percent of net assets	1.34%	1.31%	1.34%	1.34%	1.31%
Principal/Share Amount	$ 4,649	$ 4,649
PIK interest rate	0.50%	0.50%	0.50%	0.50%	0.50%
Investment, interest rate, paid in cash	10.30%	8.08%	10.30%	10.30%	8.08%
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Additional Interest For Senior Term Debt	3.50%
Investment, Identifier [Axis]: Honors Holdings, LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:HonorsHoldingsLLCMember	whf:HonorsHoldingsLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Leisure Facilities	Leisure Facilities	Leisure Facilities	Leisure Facilities	Leisure Facilities
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1%	1%	1%	1%	1%
Spread Above Index	7.56%	7.96%	7.56%	7.56%	7.96%
Interest Rate	10.73%	8.96%	10.73%	10.73%	8.96%
Acquisition Date	Sep. 06, 2019	Sep. 06, 2019
Maturity Date	Sep. 06, 2024	Sep. 06, 2024	Sep. 06, 2024	Sep. 06, 2024	Sep. 06, 2024
Investments, amortized cost	$ 9,337	$ 9,315
Investments, at fair value	$ 9,346	$ 9,296
Percent of net assets	2.72%	2.66%	2.72%	2.72%	2.66%
Principal/Share Amount	$ 9,440	$ 9,440
PIK interest rate	0.50%	0.50%	0.50%	0.50%	0.50%
Investment, interest rate, paid in cash	10.23%	8.46%	10.23%	10.23%	8.46%
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Additional Interest For Senior Term Debt	3.50%
Investment, Identifier [Axis]: I And I Sales Group, LLC First Lien Secured Delayed Draw Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]		whf:IAndISalesGroupLLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredDelayedDrawLoanMember			whf:FirstLienSecuredDelayedDrawLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Advertising			Advertising
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Floor		1%			1%
Spread Above Index		6%			6%
Interest Rate		7%			7%
Acquisition Date		Dec. 15, 2021
Maturity Date		Dec. 15, 2026			Dec. 15, 2026
Investments, amortized cost		$ 388
Investments, at fair value		$ 388
Percent of net assets		0.11%			0.11%
Principal/Share Amount		$ 396
Investment, Restriction Status [true false]		true			true
Investment, Significant Unobservable Input [true false]		true			true
Investment, Identifier [Axis]: I And I Sales Group, LLC First Lien Secured Revolving Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]		whf:IAndISalesGroupLLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredRevolvingLoanMember			whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Advertising			Advertising
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Floor		1%			1%
Spread Above Index		6%			6%
Interest Rate		7%			7%
Acquisition Date		Dec. 15, 2021
Maturity Date		Dec. 15, 2026			Dec. 15, 2026
Investment, Restriction Status [true false]		true			true
Investment, Significant Unobservable Input [true false]		true			true
Investment, Identifier [Axis]: I And I Sales Group, LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]		whf:IAndISalesGroupLLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Advertising			Advertising
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Floor		1%			1%
Spread Above Index		6%			6%
Interest Rate		7%			7%
Acquisition Date		Dec. 15, 2021
Maturity Date		Dec. 15, 2026			Dec. 15, 2026
Investments, amortized cost		$ 9,102
Investments, at fair value		$ 9,100
Percent of net assets		2.60%			2.60%
Principal/Share Amount		$ 9,286
Investment, Restriction Status [true false]		true			true
Investment, Significant Unobservable Input [true false]		true			true
Investment, Identifier [Axis]: I&I Sales Group, LLC First Lien Secured Delayed Draw Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:IAndISalesGroupLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredDelayedDrawLoanMember		whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Advertising		Advertising	Advertising
Floor	1%		1%	1%
Spread Above Index	5.75%		5.75%	5.75%
Interest Rate	9%		9%	9%
Acquisition Date	Mar. 11, 2022
Maturity Date	Dec. 15, 2026		Dec. 15, 2026	Dec. 15, 2026
Investments, amortized cost	$ 702
Investments, at fair value	707
Principal/Share Amount	$ 714
Investment, Identifier [Axis]: I&I Sales Group, LLC First Lien Secured Revolving Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:IAndISalesGroupLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember		whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Advertising		Advertising	Advertising
Floor	1%		1%	1%
Spread Above Index	5.75%		5.75%	5.75%
Interest Rate	9.42%		9.42%	9.42%
Acquisition Date	Feb. 18, 2022
Maturity Date	Dec. 15, 2026		Dec. 15, 2026	Dec. 15, 2026
Investments, at fair value	$ 1
Investment, Identifier [Axis]: I&I Sales Group, LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:IAndISalesGroupLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Advertising		Advertising	Advertising
Floor	1%		1%	1%
Spread Above Index	5.75%		5.75%	5.75%
Interest Rate	9.42%		9.42%	9.42%
Acquisition Date	Feb. 18, 2022
Maturity Date	Dec. 15, 2026		Dec. 15, 2026	Dec. 15, 2026
Investments, amortized cost	$ 9,061
Investments, at fair value	9,074
Principal/Share Amount	$ 9,216
Investment, Identifier [Axis]: IDIG Parent, LLC, First Lien Secured Delayed Draw Loan, Floor 1.00%, Spread L plus 6.00%, Rate 7.00%, Due 12/15/2026
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]		whf:IDIGParentLLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredDelayedDrawLoanMember			whf:FirstLienSecuredDelayedDrawLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Systems Software			Systems Software
Floor		1%			1%
Spread Above Index		6%			6%
Interest Rate		7%			7%
Acquisition Date		Sep. 21, 2021
Maturity Date		Dec. 15, 2026			Dec. 15, 2026
Investments, amortized cost		$ 1,397
Investments, at fair value		1,411
Principal/Share Amount		$ 1,411
Investment, Identifier [Axis]: IDIG Parent, LLC, First Lien Secured Revolving Loan, Floor 1.00%, Spread L plus 6.00%, Rate 7.00%, Due 12/15/2026
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]		whf:IDIGParentLLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredRevolvingLoanMember			whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Systems Software			Systems Software
Floor		1%			1%
Spread Above Index		6%			6%
Interest Rate		7%			7%
Acquisition Date		Jun. 25, 2021
Maturity Date		Dec. 15, 2026			Dec. 15, 2026
Investments, at fair value		$ 5
Investment, Identifier [Axis]: IDIG Parent, LLC, First Lien Secured Term Loan, Floor 1.00%, Spread L plus 6.00%, Rate 7.00%, Due 12/15/2026
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]		whf:IDIGParentLLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Systems Software			Systems Software
Floor		1%			1%
Spread Above Index		6%			6%
Interest Rate		7%			7%
Acquisition Date		Jun. 25, 2021
Maturity Date		Dec. 15, 2026			Dec. 15, 2026
Investments, amortized cost		$ 8,404
Investments, at fair value		8,482
Principal/Share Amount		$ 8,482
Investment, Identifier [Axis]: ITS Buyer Inc First Lien Secured Revolving Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]		whf:ITSBuyerIncMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredRevolvingLoanMember			whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Air Freight & Logistics			Air Freight & Logistics
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Floor		1%			1%
Spread Above Index		6%			6%
Interest Rate		7%			7%
Acquisition Date		Dec. 22, 2021
Maturity Date		Jun. 15, 2026			Jun. 15, 2026
Investment, Restriction Status [true false]		true			true
Investment, Significant Unobservable Input [true false]		true			true
Investment, Identifier [Axis]: ITS Buyer Inc First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]		whf:ITSBuyerIncMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Air Freight & Logistics			Air Freight & Logistics
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Floor		1%			1%
Spread Above Index		6%			6%
Interest Rate		7%			7%
Acquisition Date		Dec. 22, 2021
Maturity Date		Jun. 15, 2026			Jun. 15, 2026
Investments, amortized cost		$ 3,540
Investments, at fair value		$ 3,539
Percent of net assets		1.01%			1.01%
Principal/Share Amount		$ 3,612
Investment, Restriction Status [true false]		true			true
Investment, Significant Unobservable Input [true false]		true			true
Investment, Identifier [Axis]: ITS Buyer Inc. First Lien Secured Revolving Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:ITSBuyerIncMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember		whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Air Freight & Logistics		Air Freight & Logistics	Air Freight & Logistics
Floor	1%		1%	1%
Spread Above Index	6%		6%	6%
Interest Rate	9.67%		9.67%	9.67%
Acquisition Date	Feb. 17, 2022
Maturity Date	Jun. 15, 2026		Jun. 15, 2026	Jun. 15, 2026
Investments, at fair value	$ 4
Investment, Identifier [Axis]: ITS Buyer Inc. First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:ITSBuyerIncMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Air Freight & Logistics		Air Freight & Logistics	Air Freight & Logistics
Floor	1%		1%	1%
Spread Above Index	6%		6%	6%
Interest Rate	9.67%		9.67%	9.67%
Acquisition Date	Feb. 17, 2022
Maturity Date	Jun. 15, 2026		Jun. 15, 2026	Jun. 15, 2026
Investments, amortized cost	$ 3,531
Investments, at fair value	3,553
Principal/Share Amount	$ 3,589
Investment, Identifier [Axis]: ImageOne Industries, LLC Common A Units
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:ImageOneIndustriesLLCMember	whf:ImageOneIndustriesLLCMember
Investment, Type [Extensible Enumeration]	whf:CommonAUnitsMember	whf:CommonAUnitsMember	whf:CommonAUnitsMember	whf:CommonAUnitsMember	whf:CommonAUnitsMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Diversified Support Services	Diversified Support Services	Diversified Support Services	Diversified Support Services	Diversified Support Services
Acquisition Date	Sep. 20, 2019	Sep. 20, 2019
Investments, amortized cost	$ 2
Investments, at fair value	$ 84	$ 158
Percent of net assets	0.02%	0.05%	0.02%	0.02%	0.05%
Principal/Share Amount	$ 227	$ 225
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Non-income Producing [true false]	false	false	false	false	false
Investment, Identifier [Axis]: Industrial Specialty Services USA LLC First Lien Secured Revolving Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:IndustrialSpecialtyServicesUSALLCMember	whf:IndustrialSpecialtyServicesUSALLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Environmental & Facilities Services	Environmental & Facilities Services	Environmental & Facilities Services	Environmental & Facilities Services	Environmental & Facilities Services
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1%	1%	1%	1%	1%
Spread Above Index	6.25%	6.25%	6.25%	6.25%	6.25%
Interest Rate	9.18%	7.25%	9.18%	9.18%	7.25%
Acquisition Date	Dec. 31, 2021	Dec. 31, 2021
Maturity Date	Dec. 31, 2026	Dec. 31, 2026	Dec. 31, 2026	Dec. 31, 2026	Dec. 31, 2026
Investments, amortized cost	$ 871
Investments, at fair value	$ 861
Percent of net assets	0.25%		0.25%	0.25%
Principal/Share Amount	$ 886
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: Industrial Specialty Services USA LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:IndustrialSpecialtyServicesUSALLCMember	whf:IndustrialSpecialtyServicesUSALLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Environmental & Facilities Services	Environmental & Facilities Services	Environmental & Facilities Services	Environmental & Facilities Services	Environmental & Facilities Services
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1%	1%	1%	1%	1%
Spread Above Index	6.25%	6.25%	6.25%	6.25%	6.25%
Interest Rate	9.92%	7.25%	9.92%	9.92%	7.25%
Acquisition Date	Dec. 31, 2021	Dec. 31, 2021
Maturity Date	Dec. 31, 2026	Dec. 31, 2026	Dec. 31, 2026	Dec. 31, 2026	Dec. 31, 2026
Investments, amortized cost	$ 11,715	$ 11,767
Investments, at fair value	$ 11,612	$ 11,767
Percent of net assets	3.39%	3.36%	3.39%	3.39%	3.36%
Principal/Share Amount	$ 11,917	$ 12,007
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: Inspired Beauty Brands, Inc First Lien Secured Revolving Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:InspiredBeautyBrandsIncMember	whf:InspiredBeautyBrandsIncMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Personal Products	Personal Products	Personal Products	Personal Products	Personal Products
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1%	1%	1%	1%	1%
Spread Above Index	7%	7%	7%	7%	7%
Interest Rate	9.91%	8%	9.91%	9.91%	8%
Acquisition Date	Dec. 30, 2020	Dec. 30, 2020
Maturity Date	Dec. 30, 2025	Dec. 30, 2025	Dec. 30, 2025	Dec. 30, 2025	Dec. 30, 2025
Investments, at fair value	$ (6)	$ 8
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: Inspired Beauty Brands, Inc First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:InspiredBeautyBrandsIncMember	whf:InspiredBeautyBrandsIncMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Personal Products	Personal Products	Personal Products	Personal Products	Personal Products
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1%	1%	1%	1%	1%
Spread Above Index	7%	7%	7%	7%	7%
Interest Rate	9.91%	8%	9.91%	9.91%	8%
Acquisition Date	Dec. 30, 2020	Dec. 30, 2020
Maturity Date	Dec. 30, 2025	Dec. 30, 2025	Dec. 30, 2025	Dec. 30, 2025	Dec. 30, 2025
Investments, amortized cost	$ 11,650	$ 12,055
Investments, at fair value	$ 11,509	$ 12,252
Percent of net assets	3.36%	3.50%	3.36%	3.36%	3.50%
Principal/Share Amount	$ 11,804	$ 12,252
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: IvyRehab Intermediate II, LLC First Lien Secured Delayed Draw Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]		whf:IvyRehabIntermediateIILLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredDelayedDrawLoanMember			whf:FirstLienSecuredDelayedDrawLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Health Care Services			Health Care Services
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Floor		1%			1%
Spread Above Index		6.75%			6.75%
Interest Rate		7.75%			7.75%
Acquisition Date		Dec. 04, 2020
Maturity Date		Dec. 04, 2024			Dec. 04, 2024
Investments, amortized cost		$ 2,517
Investments, at fair value		$ 2,534
Percent of net assets		0.72%			0.72%
Principal/Share Amount		$ 2,550
Investment, Restriction Status [true false]		true			true
Investment, Significant Unobservable Input [true false]		true			true
Investment, Identifier [Axis]: IvyRehab Intermediate II, LLC First Lien Secured Revolving Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]		whf:IvyRehabIntermediateIILLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredRevolvingLoanMember			whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Health Care Services			Health Care Services
Investment, Variable Interest Rate, Type [Extensible Enumeration]		us-gaap:PrimeRateMember			us-gaap:PrimeRateMember
Floor		3.25%			3.25%
Spread Above Index		5.75%			5.75%
Interest Rate		9%			9%
Acquisition Date		Dec. 04, 2020
Maturity Date		Dec. 04, 2024			Dec. 04, 2024
Investments, amortized cost		$ 139
Investments, at fair value		$ 147
Percent of net assets		0.04%			0.04%
Principal/Share Amount		$ 142
Investment, Restriction Status [true false]		true			true
Investment, Significant Unobservable Input [true false]		true			true
Investment, Identifier [Axis]: IvyRehab Intermediate II, LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]		whf:IvyRehabIntermediateIILLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Health Care Services			Health Care Services
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Floor		1%			1%
Spread Above Index		6.75%			6.75%
Interest Rate		7.75%			7.75%
Acquisition Date		Dec. 04, 2020
Maturity Date		Dec. 04, 2024			Dec. 04, 2024
Investments, amortized cost		$ 17,121
Investments, at fair value		$ 17,366
Percent of net assets		4.97%			4.97%
Principal/Share Amount		$ 17,366
Investment, Restriction Status [true false]		true			true
Investment, Significant Unobservable Input [true false]		true			true
Investment, Identifier [Axis]: JVMC Holdings Corp First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:JVMCHoldingsCorpMember	whf:JVMCHoldingsCorpMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Investment Banking & Brokerage	Investment Banking & Brokerage	Investment Banking & Brokerage	Investment Banking & Brokerage	Investment Banking & Brokerage
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1%	1%	1%	1%	1%
Spread Above Index	6.50%	6.75%	6.50%	6.50%	6.75%
Interest Rate	9.62%	7.75%	9.62%	9.62%	7.75%
Acquisition Date	Feb. 28, 2019	Feb. 28, 2019
Maturity Date	Feb. 28, 2024	Feb. 28, 2024	Feb. 28, 2024	Feb. 28, 2024	Feb. 28, 2024
Investments, amortized cost	$ 12,043	$ 12,674
Investments, at fair value	$ 12,077	$ 12,729
Percent of net assets	3.52%	3.64%	3.52%	3.52%	3.64%
Principal/Share Amount	$ 12,077	$ 12,729
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: JZ Capital Partners Ltd First Lien Secured Delayed Draw Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments		Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:JZCapitalPartnersLtdMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredDelayedDrawLoanMember		whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Asset Management & Custody Banks		Asset Management & Custody Banks	Asset Management & Custody Banks
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]		London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1%		1%	1%
Spread Above Index	7%		7%	7%
Interest Rate	9.77%		9.77%	9.77%
Acquisition Date	Jan. 26, 2022
Maturity Date	Jan. 26, 2027		Jan. 26, 2027	Jan. 26, 2027
Investments, at fair value	$ 22
Percent of net assets	0.01%		0.01%	0.01%
Investment, Restriction Status [true false]	true		true	true
Investment, Significant Unobservable Input [true false]	true		true	true
Investment, Identifier [Axis]: JZ Capital Partners Ltd First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments		Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:JZCapitalPartnersLtdMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Asset Management & Custody Banks		Asset Management & Custody Banks	Asset Management & Custody Banks
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]		London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1%		1%	1%
Spread Above Index	7%		7%	7%
Interest Rate	9.77%		9.77%	9.77%
Acquisition Date	Jan. 26, 2022
Maturity Date	Jan. 26, 2027		Jan. 26, 2027	Jan. 26, 2027
Investments, amortized cost	$ 10,108
Investments, at fair value	$ 10,147
Percent of net assets	2.96%		2.96%	2.96%
Principal/Share Amount	$ 10,286
Investment, Restriction Status [true false]	true		true	true
Investment, Significant Unobservable Input [true false]	true		true	true
Investment, Identifier [Axis]: Juniper Landscaping Holdings LLC First Lien Secured Delayed Draw Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]		whf:JuniperLandscapingHoldingsLLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredDelayedDrawLoanMember			whf:FirstLienSecuredDelayedDrawLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Environmental & Facilities Services			Environmental & Facilities Services
Floor		1%			1%
Spread Above Index		6%			6%
Interest Rate		7%			7%
Acquisition Date		Dec. 29, 2021
Maturity Date		Dec. 29, 2026			Dec. 29, 2026
Investment, Restriction Status [true false]		true			true
Investment, Significant Unobservable Input [true false]		true			true
Investment, Identifier [Axis]: Juniper Landscaping Holdings LLC First Lien Secured Delayed Draw Loan Due 12/29/2026
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:JuniperLandscapingHoldingsLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredDelayedDrawLoanMember		whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Environmental & Facilities Services		Environmental & Facilities Services	Environmental & Facilities Services
Floor	1%		1%	1%
Spread Above Index	6%		6%	6%
Interest Rate	9.67%		9.67%	9.67%
Acquisition Date	Mar. 01, 2022
Maturity Date	Dec. 29, 2026		Dec. 29, 2026	Dec. 29, 2026
Investments, at fair value	$ (3)
Investment, Identifier [Axis]: Juniper Landscaping Holdings LLC First Lien Secured Revolving Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]		whf:JuniperLandscapingHoldingsLLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredRevolvingLoanMember			whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Environmental & Facilities Services			Environmental & Facilities Services
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Floor		1%			1%
Spread Above Index		6%			6%
Interest Rate		7%			7%
Acquisition Date		Dec. 29, 2021
Maturity Date		Dec. 29, 2026			Dec. 29, 2026
Investments, amortized cost		$ 586
Investments, at fair value		$ 586
Percent of net assets		0.17%			0.17%
Principal/Share Amount		$ 597
Investment, Restriction Status [true false]		true			true
Investment, Significant Unobservable Input [true false]		true			true
Investment, Identifier [Axis]: Juniper Landscaping Holdings LLC First Lien Secured Revolving Loan Due 12/29/2026
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:JuniperLandscapingHoldingsLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember		whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Environmental & Facilities Services		Environmental & Facilities Services	Environmental & Facilities Services
Floor	1%		1%	1%
Spread Above Index	6%		6%	6%
Interest Rate	9.67%		9.67%	9.67%
Acquisition Date	Mar. 01, 2022
Maturity Date	Dec. 29, 2026		Dec. 29, 2026	Dec. 29, 2026
Investments, at fair value	$ (1)
Investment, Identifier [Axis]: Juniper Landscaping Holdings LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]		whf:JuniperLandscapingHoldingsLLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Environmental & Facilities Services			Environmental & Facilities Services
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Floor		1%			1%
Spread Above Index		6%			6%
Interest Rate		7%			7%
Acquisition Date		Dec. 29, 2021
Maturity Date		Dec. 29, 2026			Dec. 29, 2026
Investments, amortized cost		$ 11,221
Investments, at fair value		$ 11,220
Percent of net assets		3.21%			3.21%
Principal/Share Amount		$ 11,420
Investment, Restriction Status [true false]		true			true
Investment, Significant Unobservable Input [true false]		true			true
Investment, Identifier [Axis]: Juniper Landscaping Holdings LLC First Lien Secured Term Loan Due 12/29/2026
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:JuniperLandscapingHoldingsLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Environmental & Facilities Services		Environmental & Facilities Services	Environmental & Facilities Services
Floor	1%		1%	1%
Spread Above Index	6%		6%	6%
Interest Rate	9.67%		9.67%	9.67%
Acquisition Date	Mar. 01, 2022
Maturity Date	Dec. 29, 2026		Dec. 29, 2026	Dec. 29, 2026
Investments, amortized cost	$ 11,165
Investments, at fair value	11,151
Principal/Share Amount	$ 11,334
Investment, Identifier [Axis]: Keras Holdings, LLC Shares
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments		Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:KerasHoldingsLLCMember	whf:KerasHoldingsLLCMember
Investment, Type [Extensible Enumeration]	Common Stock [Member]	Common Stock [Member]	Common Stock [Member]	Common Stock [Member]	Common Stock [Member]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	IT Consulting And Other Services	IT Consulting And Other Services	IT Consulting And Other Services	IT Consulting And Other Services	IT Consulting And Other Services
Acquisition Date	Dec. 31, 2020	Dec. 31, 2020
Investments, amortized cost	$ 496	$ 496
Investments, at fair value	$ 361	$ 496
Percent of net assets	0.11%	0.14%	0.11%	0.11%	0.14%
Principal/Share Amount	$ 496	$ 496
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Non-income Producing [true false]	false	false	false	false	false
Investment, Identifier [Axis]: LHS Borrower, LLC First Lien Secured Revolving Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]		whf:LHSBorrowerLLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredRevolvingLoanMember			whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Building Products			Building Products
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Floor		1%			1%
Spread Above Index		6.75%			6.75%
Interest Rate		7.75%			7.75%
Acquisition Date		Sep. 30, 2020
Maturity Date		Sep. 30, 2025			Sep. 30, 2025
Investments, at fair value		$ 4
Investment, Restriction Status [true false]		true			true
Investment, Significant Unobservable Input [true false]		true			true
Investment, Identifier [Axis]: LHS Borrower, LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]		whf:LHSBorrowerLLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Building Products			Building Products
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Floor		1%			1%
Spread Above Index		6.75%			6.75%
Interest Rate		7.75%			7.75%
Acquisition Date		Sep. 30, 2020
Maturity Date		Sep. 30, 2025			Sep. 30, 2025
Investments, amortized cost		$ 9,346
Investments, at fair value		$ 9,416
Percent of net assets		2.69%			2.69%
Principal/Share Amount		$ 9,506
Investment, Restriction Status [true false]		true			true
Investment, Significant Unobservable Input [true false]		true			true
Investment, Identifier [Axis]: LHS Borrower, LLC, First Lien Secured Revolving Loan, Floor 1.00%, Spread L plus 6.75%, Rate 7.75%, Due 9/30/2025
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]		whf:LHSBorrowerLLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredRevolvingLoanMember			whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Building Products			Building Products
Floor		1%			1%
Spread Above Index		6.75%			6.75%
Interest Rate		7.75%			7.75%
Acquisition Date		Oct. 09, 2020
Maturity Date		Sep. 30, 2025			Sep. 30, 2025
Investments, at fair value		$ 4
Investment, Identifier [Axis]: LHS Borrower, LLC, First Lien Secured Term Loan, Floor 1.00%, Spread L plus 6.75%, Rate 7.75%, Due 9/30/2025
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]		whf:LHSBorrowerLLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Building Products			Building Products
Floor		1%			1%
Spread Above Index		6.75%			6.75%
Interest Rate		7.75%			7.75%
Acquisition Date		Oct. 09, 2020
Maturity Date		Sep. 30, 2025			Sep. 30, 2025
Investments, amortized cost		$ 9,345
Investments, at fair value		9,416
Principal/Share Amount		$ 9,506
Investment, Identifier [Axis]: LINC Systems LLC First Lien Secured Revolving Loan Floor 1.00 Libor Plus 6.25 Rate Due 2242026
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:LINCSystemsLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember		whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Trading Companies And Distributors [Member]		Trading Companies And Distributors [Member]	Trading Companies And Distributors [Member]
Floor	1%		1%	1%
Spread Above Index	6.25%		6.25%	6.25%
Interest Rate	10.33%		10.33%	10.33%
Acquisition Date	Jun. 22, 2021
Maturity Date	Feb. 24, 2026		Feb. 24, 2026	Feb. 24, 2026
Investments, at fair value	$ 10
Investment, Identifier [Axis]: LINC Systems LLC First Lien Secured Term Loan Floor 1.00 Libor Plus 6.25 Rate Due 2242026
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:LINCSystemsLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Trading Companies And Distributors [Member]		Trading Companies And Distributors [Member]	Trading Companies And Distributors [Member]
Floor	1%		1%	1%
Spread Above Index	6.25%		6.25%	6.25%
Interest Rate	10.33%		10.33%	10.33%
Acquisition Date	Jun. 22, 2021
Maturity Date	Feb. 24, 2026		Feb. 24, 2026	Feb. 24, 2026
Investments, amortized cost	$ 9,909
Investments, at fair value	10,058
Principal/Share Amount	$ 10,058
Investment, Identifier [Axis]: LINC Systems, LLC, First Lien Secured Delayed Draw Loan, Floor 1.50%, Spread L plus 6.25%, Rate 7.25%, Due 2/24/2026
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]		whf:LINCSystemsLLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Technology Hardware, Storage & Peripherals			Technology Hardware, Storage & Peripherals
Floor		1%			1%
Spread Above Index		6.25%			6.25%
Interest Rate		7.25%			7.25%
Acquisition Date		Jun. 22, 2021
Maturity Date		Feb. 24, 2026			Feb. 24, 2026
Investments, amortized cost		$ 9,951
Investments, at fair value		10,101
Principal/Share Amount		$ 10,135
Investment, Identifier [Axis]: LINC Systems, LLC, First Lien Secured Revolving Loan, Floor 1.50%, Spread L plus 6.25%, Rate 7.25%, Due 2/24/2026
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]		whf:LINCSystemsLLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredRevolvingLoanMember			whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Technology Hardware, Storage & Peripherals			Technology Hardware, Storage & Peripherals
Floor		1%			1%
Spread Above Index		6.25%			6.25%
Interest Rate		7.25%			7.25%
Acquisition Date		Jun. 22, 2021
Maturity Date		Feb. 24, 2026			Feb. 24, 2026
Investments, at fair value		$ 12
Investment, Identifier [Axis]: LMG Holdings, Inc First Lien Secured Revolving Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]		whf:LMGHoldingsIncMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredRevolvingLoanMember			whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Electronic Equipment & Instruments			Electronic Equipment & Instruments
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Floor		1%			1%
Spread Above Index		6.50%			6.50%
Interest Rate		7.50%			7.50%
Acquisition Date		Apr. 30, 2021
Maturity Date		Apr. 30, 2026			Apr. 30, 2026
Investment, Restriction Status [true false]		true			true
Investment, Significant Unobservable Input [true false]		true			true
Investment, Identifier [Axis]: LMG Holdings, Inc First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]		whf:LMGHoldingsIncMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Electronic Equipment & Instruments			Electronic Equipment & Instruments
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Floor		1%			1%
Spread Above Index		6.50%			6.50%
Interest Rate		7.50%			7.50%
Acquisition Date		Apr. 30, 2021
Maturity Date		Apr. 30, 2026			Apr. 30, 2026
Investments, amortized cost		$ 6,684
Investments, at fair value		$ 6,687
Percent of net assets		1.91%			1.91%
Principal/Share Amount		$ 6,802
Investment, Restriction Status [true false]		true			true
Investment, Significant Unobservable Input [true false]		true			true
Investment, Identifier [Axis]: LMG Holdings, Inc., First Lien Secured Revolving Loan, Floor 1.00%, Spread L plus 6.50%, Rate 7.50%, Due 4/30/2026
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:LMGHoldingsIncMember	whf:LMGHoldingsIncMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Electronic Equipment & Instruments	Electronic Equipment & Instruments	Electronic Equipment & Instruments	Electronic Equipment & Instruments	Electronic Equipment & Instruments
Floor	1%	1%	1%	1%	1%
Spread Above Index	7%	6.50%	7%	7%	6.50%
Interest Rate	10.09%	7.50%	10.09%	10.09%	7.50%
Acquisition Date	Jun. 28, 2021	Jun. 28, 2021
Maturity Date	Apr. 30, 2026	Apr. 30, 2026	Apr. 30, 2026	Apr. 30, 2026	Apr. 30, 2026
Investments, amortized cost	$ 261
Investments, at fair value	256
Principal/Share Amount	$ 265
Investment, Identifier [Axis]: LMG Holdings, Inc., First Lien Secured Term Loan, Floor 1.00%, Spread L plus 6.50%, Rate 7.50%, Due 4/30/2026
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:LMGHoldingsIncMember	whf:LMGHoldingsIncMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Electronic Equipment & Instruments	Electronic Equipment & Instruments	Electronic Equipment & Instruments	Electronic Equipment & Instruments	Electronic Equipment & Instruments
Floor	1%	1%	1%	1%	1%
Spread Above Index	7%	6.50%	7%	7%	6.50%
Interest Rate	10.67%	7.50%	10.67%	10.67%	7.50%
Acquisition Date	Jun. 28, 2021	Jun. 28, 2021
Maturity Date	Apr. 30, 2026	Apr. 30, 2026	Apr. 30, 2026	Apr. 30, 2026	Apr. 30, 2026
Investments, amortized cost	$ 13,303	$ 6,680
Investments, at fair value	13,229	6,687
Principal/Share Amount	$ 13,501	$ 6,802
Investment, Identifier [Axis]: LSCS Holdings, Inc Second Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:LSCSHoldingsIncMember	whf:LSCSHoldingsIncMember
Investment, Type [Extensible Enumeration]	whf:SecondLienSecuredTermLoanMember	whf:SecondLienSecuredTermLoanMember	whf:SecondLienSecuredTermLoanMember	whf:SecondLienSecuredTermLoanMember	whf:SecondLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Life Sciences Tools & Services	Life Sciences Tools & Services	Life Sciences Tools & Services	Life Sciences Tools & Services	Life Sciences Tools & Services
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	0.50%	0.50%	0.50%	0.50%	0.50%
Spread Above Index	8%	8%	8%	8%	8%
Interest Rate	11.67%	8.50%	11.67%	11.67%	8.50%
Acquisition Date	Nov. 23, 2021	Nov. 23, 2021
Maturity Date	Dec. 16, 2029	Dec. 16, 2029	Dec. 16, 2029	Dec. 16, 2029	Dec. 16, 2029
Investments, amortized cost	$ 4,932	$ 4,925
Investments, at fair value	$ 4,912	$ 4,925
Percent of net assets	1.43%	1.41%	1.43%	1.43%	1.41%
Principal/Share Amount	$ 5,000	$ 5,000
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: Lab Logistics, LLC First Lien Secured Delayed Draw Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:LabLogisticsLLCMember	whf:LabLogisticsLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Health Care Services	Health Care Services	Health Care Services	Health Care Services	Health Care Services
Investment, Variable Interest Rate, Type [Extensible Enumeration]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	London Interbank Offered Rate (LIBOR) [Member]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1%	1%	1%	1%	1%
Spread Above Index	7.25%	7.25%	7.25%	7.25%	7.25%
Interest Rate	10.20%	8.25%	10.20%	10.20%	8.25%
Acquisition Date	Oct. 16, 2019	Oct. 16, 2019
Maturity Date	Sep. 25, 2023	Sep. 25, 2023	Sep. 25, 2023	Sep. 25, 2023	Sep. 25, 2023
Investments, amortized cost	$ 5,135	$ 5,166
Investments, at fair value	$ 5,144	$ 5,183
Percent of net assets	1.50%	1.48%	1.50%	1.50%	1.48%
Principal/Share Amount	$ 5,144	$ 5,183
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: Lab Logistics, LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:LabLogisticsLLCMember	whf:LabLogisticsLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Health Care Services	Health Care Services	Health Care Services	Health Care Services	Health Care Services
Investment, Variable Interest Rate, Type [Extensible Enumeration]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	London Interbank Offered Rate (LIBOR) [Member]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1%	1%	1%	1%	1%
Spread Above Index	7.25%	7.25%	7.25%	7.25%	7.25%
Interest Rate	10.16%	8.25%	10.16%	10.16%	8.25%
Acquisition Date	Oct. 16, 2019	Oct. 16, 2019
Maturity Date	Sep. 25, 2023	Sep. 25, 2023	Sep. 25, 2023	Sep. 25, 2023	Sep. 25, 2023
Investments, amortized cost	$ 5,446	$ 1,140
Investments, at fair value	$ 5,495	$ 1,155
Percent of net assets	1.60%	0.33%	1.60%	1.60%	0.33%
Principal/Share Amount	$ 5,501	$ 1,155
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: Lab Logistics, LLC Preferred Units
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]		whf:LabLogisticsLLCMember
Investment, Type [Extensible Enumeration]		whf:PreferredUnitsMember			whf:PreferredUnitsMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Health Care Services			Health Care Services
Spread Above Index		14%			14%
Acquisition Date		Oct. 29, 2019
Investments, amortized cost		$ 857
Investments, at fair value		$ 1,018
Percent of net assets		0.29%			0.29%
Principal/Share Amount		$ 2
PIK interest rate		14%			14%
Investment, Restriction Status [true false]		true			true
Investment, Significant Unobservable Input [true false]		true			true
Investment, Non-income Producing [true false]		true			true
Investment, Identifier [Axis]: Lenny & Larry's, LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:LennyLarrysLLCMember	whf:LennyLarrysLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Packaged Foods & Meats	Packaged Foods & Meats	Packaged Foods & Meats	Packaged Foods & Meats	Packaged Foods & Meats
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1%	1%	1%	1%	1%
Spread Above Index	8.92%	8.40%	8.92%	8.92%	8.40%
Interest Rate	11.74%	9.40%	11.74%	11.74%	9.40%
Acquisition Date	May 15, 2018	May 15, 2018
Maturity Date	May 15, 2023	May 15, 2023	May 15, 2023	May 15, 2023	May 15, 2023
Investments, amortized cost	$ 11,175	$ 11,084
Investments, at fair value	$ 10,922	$ 10,862
Percent of net assets	3.19%	3.11%	3.19%	3.19%	3.11%
Principal/Share Amount	$ 11,201	$ 11,142
PIK interest rate	1.71%	1.72%	1.71%	1.71%	1.72%
Investment, interest rate, paid in cash	10.03%	7.68%	10.03%	10.03%	7.68%
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Additional interest for senior term debt	3%
Investment, Identifier [Axis]: Lift Brands, Inc First Lien Secured Term Loan A
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:LiftBrandsIncMember	whf:LiftBrandsIncMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanAMember	whf:FirstLienSecuredTermLoanAMember	whf:FirstLienSecuredTermLoanAMember	whf:FirstLienSecuredTermLoanAMember	whf:FirstLienSecuredTermLoanAMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Leisure Facilities	Leisure Facilities	Leisure Facilities	Leisure Facilities	Leisure Facilities
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1%	1%	1%	1%	1%
Spread Above Index	7.50%	7.50%	7.50%	7.50%	7.50%
Interest Rate	10.62%	8.50%	10.62%	10.62%	8.50%
Acquisition Date	Jun. 29, 2020	Jun. 29, 2020
Maturity Date	Jun. 29, 2025	Jun. 29, 2025	Jun. 29, 2025	Jun. 29, 2025	Jun. 29, 2025
Investments, amortized cost	$ 5,541	$ 5,570
Investments, at fair value	$ 5,533	$ 5,546
Percent of net assets	1.61%	1.59%	1.61%	1.61%	1.59%
Principal/Share Amount	$ 5,588	$ 5,631
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: Lift Brands, Inc First Lien Secured Term Loan B
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:LiftBrandsIncMember	whf:LiftBrandsIncMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanBMember	whf:FirstLienSecuredTermLoanBMember	whf:FirstLienSecuredTermLoanBMember	whf:FirstLienSecuredTermLoanBMember	whf:FirstLienSecuredTermLoanBMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Leisure Facilities	Leisure Facilities	Leisure Facilities	Leisure Facilities	Leisure Facilities
Spread Above Index	9.50%	9.50%	9.50%	9.50%	9.50%
Interest Rate	9.50%	9.50%	9.50%	9.50%	9.50%
Acquisition Date	Jun. 29, 2020	Jun. 29, 2020
Maturity Date	Jun. 29, 2025	Jun. 29, 2025	Jun. 29, 2025	Jun. 29, 2025	Jun. 29, 2025
Investments, amortized cost	$ 1,314	$ 1,259
Investments, at fair value	$ 1,302	$ 1,239
Percent of net assets	0.38%	0.35%	0.38%	0.38%	0.35%
Principal/Share Amount	$ 1,330	$ 1,279
PIK interest rate	9.50%	9.50%	9.50%	9.50%	9.50%
Investment, interest rate, paid in cash	0%	0%	0%	0%	0%
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: Luxury Brand Holdings, Inc First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:LuxuryBrandHoldingsIncMember	whf:LuxuryBrandHoldingsIncMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Internet & Direct Marketing Retail	Internet & Direct Marketing Retail	Internet & Direct Marketing Retail	Internet & Direct Marketing Retail	Internet & Direct Marketing Retail
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1%	1%	1%	1%	1%
Spread Above Index	6.50%	6.50%	6.50%	6.50%	6.50%
Interest Rate	9.31%	7.50%	9.31%	9.31%	7.50%
Acquisition Date	Dec. 04, 2020	Dec. 04, 2020
Maturity Date	Jun. 04, 2026	Jun. 04, 2026	Jun. 04, 2026	Jun. 04, 2026	Jun. 04, 2026
Investments, amortized cost	$ 5,816	$ 5,844
Investments, at fair value	$ 5,854	$ 5,940
Percent of net assets	1.71%	1.70%	1.71%	1.71%	1.70%
Principal/Share Amount	$ 5,895	$ 5,940
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: MEP-TS Midco, LLC, First Lien Secured Revolving Loan, Floor 1.00%, Spread L plus 6.00%, Rate 7.00%, Due 12/31/2026
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:MEP-TSMidcoLLCMember	whf:MEP-TSMidcoLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Application Software	Application Software	Application Software	Application Software	Application Software
Floor	1%	1%	1%	1%	1%
Spread Above Index	6%	6%	6%	6%	6%
Interest Rate	8.88%	7%	8.88%	8.88%	7%
Acquisition Date	Jan. 21, 2021	Jan. 21, 2021
Maturity Date	Dec. 31, 2026	Dec. 31, 2026	Dec. 31, 2026	Dec. 31, 2026	Dec. 31, 2026
Investments, at fair value	$ 24	$ 28
Investment, Identifier [Axis]: MEP-TS Midco, LLC, First Lien Secured Term Loan, Floor 1.00%, Spread L plus 6.00%, Rate 7.00%, Due 12/31/2026
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:MEP-TSMidcoLLCMember	whf:MEP-TSMidcoLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Application Software	Application Software	Application Software	Application Software	Application Software
Floor	1%	1%	1%	1%	1%
Spread Above Index	6%	6%	6%	6%	6%
Interest Rate	8.88%	7%	8.88%	8.88%	7%
Acquisition Date	Jan. 21, 2021	Jan. 21, 2021
Maturity Date	Dec. 31, 2026	Dec. 31, 2026	Dec. 31, 2026	Dec. 31, 2026	Dec. 31, 2026
Investments, amortized cost	$ 13,183	$ 13,247
Investments, at fair value	13,387	13,490
Principal/Share Amount	$ 13,387	$ 13,490
Investment, Identifier [Axis]: MSI Information Services, Inc First Lien Secured Revolving Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments		Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:MSIInformationServicesIncMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember		whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Interactive Media & Services		Interactive Media & Services	Interactive Media & Services
Investment, Variable Interest Rate, Type [Extensible Enumeration]	us-gaap:BaseRateMember		us-gaap:BaseRateMember	us-gaap:BaseRateMember
Floor	1%		1%	1%
Spread Above Index	6.75%		6.75%	6.75%
Interest Rate	13%		13%	13%
Acquisition Date	Apr. 25, 2022
Maturity Date	Apr. 24, 2026		Apr. 24, 2026	Apr. 24, 2026
Investments, amortized cost	$ 295
Investments, at fair value	$ 286
Percent of net assets	0.08%		0.08%	0.08%
Principal/Share Amount	$ 300
Investment, Restriction Status [true false]	true		true	true
Investment, Significant Unobservable Input [true false]	true		true	true
Investment, Identifier [Axis]: MSI Information Services, Inc First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments		Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:MSIInformationServicesIncMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Interactive Media & Services		Interactive Media & Services	Interactive Media & Services
Investment, Variable Interest Rate, Type [Extensible Enumeration]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]		Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
Floor	1%		1%	1%
Spread Above Index	7.75%		7.75%	7.75%
Interest Rate	10.88%		10.88%	10.88%
Acquisition Date	Apr. 25, 2022
Maturity Date	Apr. 24, 2026		Apr. 24, 2026	Apr. 24, 2026
Investments, amortized cost	$ 7,711
Investments, at fair value	$ 7,647
Percent of net assets	2.23%		2.23%	2.23%
Principal/Share Amount	$ 7,851
Investment, Restriction Status [true false]	true		true	true
Investment, Significant Unobservable Input [true false]	true		true	true
Investment, Identifier [Axis]: Manchester Acquisition Sub LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:ManchesterAcquisitionSubLLCMember	whf:ManchesterAcquisitionSubLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Diversified Chemicals	Diversified Chemicals	Diversified Chemicals	Diversified Chemicals	Diversified Chemicals
Investment, Variable Interest Rate, Type [Extensible Enumeration]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	whf:SecuredOvernightFinancingRateMember	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	whf:SecuredOvernightFinancingRateMember
Floor	0.75%	0.75%	0.75%	0.75%	0.75%
Spread Above Index	5.75%	5.75%	5.75%	5.75%	5.75%
Interest Rate	8.85%	6.50%	8.85%	8.85%	6.50%
Acquisition Date	Nov. 16, 2021	Nov. 16, 2021
Maturity Date	Nov. 16, 2026	Nov. 16, 2026	Nov. 16, 2026	Nov. 16, 2026	Nov. 16, 2026
Investments, amortized cost	$ 7,575	$ 11,348
Investments, at fair value	$ 7,246	$ 11,340
Percent of net assets	2.11%	3.24%	2.11%	2.11%	3.24%
Principal/Share Amount	$ 7,940	$ 12,000
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: Marlin DTC-LS Midco 2, LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]		whf:MarlinDTC-LSMidco2LLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Internet & Direct Marketing Retail			Internet & Direct Marketing Retail
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Floor		1%			1%
Spread Above Index		6.50%			6.50%
Interest Rate		7.50%			7.50%
Acquisition Date		Aug. 06, 2021
Maturity Date		Jul. 01, 2025			Jul. 01, 2025
Investments, amortized cost		$ 4,200
Investments, at fair value		$ 4,206
Percent of net assets		1.20%			1.20%
Principal/Share Amount		$ 4,277
Investment, Restriction Status [true false]		true			true
Investment, Significant Unobservable Input [true false]		true			true
Investment, Identifier [Axis]: Marlin DTC-LS Midco 2, LLC, First Lien Secured Revolving Loan, Floor 1.00%, Spread L plus 6.50%, Rate 7.50%, Due 7/1/2025
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:MarlinDTC-LSMidco2LLCMember	whf:MarlinDTC-LSMidco2LLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Internet & Direct Marketing Retail	Internet & Direct Marketing Retail	Internet & Direct Marketing Retail	Internet & Direct Marketing Retail	Internet & Direct Marketing Retail
Floor	1%	1%	1%	1%	1%
Spread Above Index	6.50%	6.50%	6.50%	6.50%	6.50%
Interest Rate	9.57%	7.50%	9.57%	9.57%	7.50%
Acquisition Date	Jul. 19, 2019	Jul. 19, 2019
Maturity Date	Jul. 01, 2025	Jul. 01, 2025	Jul. 01, 2025	Jul. 01, 2025	Jul. 01, 2025
Investments, at fair value	$ 9	$ 11
Investment, Identifier [Axis]: Marlin DTC-LS Midco 2, LLC, First Lien Secured Term Loan, Floor 1.00%, Spread L plus 6.50%, Rate 7.50%, Due 7/1/2025
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:MarlinDTC-LSMidco2LLCMember	whf:MarlinDTC-LSMidco2LLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Internet & Direct Marketing Retail	Internet & Direct Marketing Retail	Internet & Direct Marketing Retail	Internet & Direct Marketing Retail	Internet & Direct Marketing Retail
Floor	1%	1%	1%	1%	1%
Spread Above Index	6.50%	6.50%	6.50%	6.50%	6.50%
Interest Rate	9.57%	7.50%	9.57%	9.57%	7.50%
Acquisition Date	Jul. 19, 2019	Jul. 19, 2019
Maturity Date	Jul. 01, 2025	Jul. 01, 2025	Jul. 01, 2025	Jul. 01, 2025	Jul. 01, 2025
Investments, amortized cost	$ 18,901	$ 15,153
Investments, at fair value	19,105	15,342
Principal/Share Amount	$ 19,105	$ 15,342
Investment, Identifier [Axis]: Max Solutions Inc. Common Stock
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments		Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	Max Solutions Inc
Investment, Type [Extensible Enumeration]	Common Stock [Member]		Common Stock [Member]	Common Stock [Member]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Paper Packaging		Paper Packaging	Paper Packaging
Acquisition Date	Sep. 29, 2022
Investments, amortized cost	$ 400
Investments, at fair value	$ 400
Percent of net assets	0.12%		0.12%	0.12%
Principal/Share Amount	$ 4
Investment, Restriction Status [true false]	true		true	true
Investment, Significant Unobservable Input [true false]	true		true	true
Investment, Non-income Producing [true false]	false		false	false
Investment, Identifier [Axis]: Max Solutions Inc. First Lien Secured Delayed Draw Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments		Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:LennyLarrysLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredDelayedDrawLoanMember		whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Paper Packaging		Paper Packaging	Paper Packaging
Investment, Variable Interest Rate, Type [Extensible Enumeration]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]		Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
Floor	1%		1%	1%
Spread Above Index	6.50%		6.50%	6.50%
Interest Rate	10.21%		10.21%	10.21%
Acquisition Date	Sep. 29, 2022
Maturity Date	Sep. 29, 2028		Sep. 29, 2028	Sep. 29, 2028
Investment, Restriction Status [true false]	true		true	true
Investment, Significant Unobservable Input [true false]	true		true	true
Investment, Identifier [Axis]: Max Solutions Inc. First Lien Secured Revolving Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments		Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:LennyLarrysLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember		whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Paper Packaging		Paper Packaging	Paper Packaging
Investment, Variable Interest Rate, Type [Extensible Enumeration]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]		Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
Floor	1%		1%	1%
Spread Above Index	6.50%		6.50%	6.50%
Interest Rate	10.21%		10.21%	10.21%
Acquisition Date	Sep. 29, 2022
Maturity Date	Sep. 29, 2028		Sep. 29, 2028	Sep. 29, 2028
Investment, Restriction Status [true false]	true		true	true
Investment, Significant Unobservable Input [true false]	true		true	true
Investment, Identifier [Axis]: Max Solutions Inc. First Lien Secured Revolving Loan CAD
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments		Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:LennyLarrysLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember		whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Paper Packaging		Paper Packaging	Paper Packaging
Investment, Variable Interest Rate, Type [Extensible Enumeration]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]		Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
Floor	1%		1%	1%
Spread Above Index	6.50%		6.50%	6.50%
Interest Rate	10.21%		10.21%	10.21%
Acquisition Date	Sep. 29, 2022
Maturity Date	Sep. 29, 2028		Sep. 29, 2028	Sep. 29, 2028
Investment, Restriction Status [true false]	true		true	true
Investment, Significant Unobservable Input [true false]	true		true	true
Investment, Identifier [Axis]: Max Solutions Inc. First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments		Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:LennyLarrysLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Industry Sector [Extensible Enumeration]	Paper Packaging		Paper Packaging	Paper Packaging
Investment, Variable Interest Rate, Type [Extensible Enumeration]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]		Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
Floor	1%		1%	1%
Spread Above Index	6.50%		6.50%	6.50%
Interest Rate	10.21%		10.21%	10.21%
Acquisition Date	Sep. 29, 2022
Maturity Date	Sep. 29, 2028		Sep. 29, 2028	Sep. 29, 2028
Investments, amortized cost	$ 8,099
Investments, at fair value	$ 8,099
Percent of net assets	2.35%		2.35%	2.35%
Principal/Share Amount	$ 8,264
Investment, Restriction Status [true false]	true		true	true
Investment, Significant Unobservable Input [true false]	true		true	true
Investment, Identifier [Axis]: Maxitransfers Blocker Corp First Lien Secured Revolving Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]		whf:MaxitransfersBlockerCorpMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredRevolvingLoanMember			whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Consumer Finance			Consumer Finance
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Floor		1%			1%
Spread Above Index		8.50%			8.50%
Interest Rate		9.50%			9.50%
Acquisition Date		Oct. 07, 2020
Maturity Date		Oct. 07, 2025			Oct. 07, 2025
Investments, amortized cost		$ 1,019
Investments, at fair value		$ 1,038
Percent of net assets		0.30%			0.30%
Principal/Share Amount		$ 1,038
Investment, Restriction Status [true false]		true			true
Investment, Significant Unobservable Input [true false]		true			true
Investment, Identifier [Axis]: Maxitransfers Blocker Corp First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]		whf:MaxitransfersBlockerCorpMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Consumer Finance			Consumer Finance
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Floor		1%			1%
Spread Above Index		8.50%			8.50%
Interest Rate		9.50%			9.50%
Acquisition Date		Oct. 07, 2020
Maturity Date		Oct. 07, 2025			Oct. 07, 2025
Investments, amortized cost		$ 8,436
Investments, at fair value		$ 8,590
Percent of net assets		2.46%			2.46%
Principal/Share Amount		$ 8,590
Investment, Restriction Status [true false]		true			true
Investment, Significant Unobservable Input [true false]		true			true
Investment, Identifier [Axis]: Meta Buyer LLC, First Lien Secured Delayed Draw Loan, Floor 1.00%, Spread L plus 6.00%, Rate 7.97%, Due 11/1/2027
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:MetaBuyerLLCMember	whf:MetaBuyerLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Pharmaceuticals [Member]	Personal Products	Pharmaceuticals [Member]	Pharmaceuticals [Member]	Personal Products
Floor	1%	1%	1%	1%	1%
Spread Above Index	6%	6%	6%	6%	6%
Interest Rate	9.52%	7%	9.52%	9.52%	7%
Acquisition Date	Dec. 16, 2021	Dec. 16, 2021
Maturity Date	Nov. 01, 2027	Nov. 01, 2027	Nov. 01, 2027	Nov. 01, 2027	Nov. 01, 2027
Investments, amortized cost	$ 881
Investments, at fair value	885
Principal/Share Amount	$ 897
Investment, Identifier [Axis]: Meta Buyer LLC, First Lien Secured Revolving Loan, Floor 1.00%, Spread L plus 6.00%, Rate 7.97%, Due 11/1/2027
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:MetaBuyerLLCMember	whf:MetaBuyerLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Pharmaceuticals [Member]	Personal Products	Pharmaceuticals [Member]	Pharmaceuticals [Member]	Personal Products
Floor	1%	1%	1%	1%	1%
Spread Above Index	6%	6%	6%	6%	6%
Interest Rate	8.80%	7%	8.80%	8.80%	7%
Acquisition Date	Dec. 16, 2021	Dec. 16, 2021
Maturity Date	Nov. 01, 2027	Nov. 01, 2027	Nov. 01, 2027	Nov. 01, 2027	Nov. 01, 2027
Investments, amortized cost		$ 246
Investments, at fair value	$ 6	246
Principal/Share Amount		$ 251
Investment, Identifier [Axis]: Meta Buyer LLC, First lien Secured Term Loan, Floor 1.00%, Spread E plus 6.00%, Rate 7.00%, Due 11/1/2027
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:MetaBuyerLLCMember	whf:MetaBuyerLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Pharmaceuticals [Member]	Personal Products	Pharmaceuticals [Member]	Pharmaceuticals [Member]	Personal Products
Floor	1%	1%	1%	1%	1%
Spread Above Index	6%	6%	6%	6%	6%
Interest Rate	7%	7%	7%	7%	7%
Acquisition Date	Dec. 16, 2021	Dec. 16, 2021
Maturity Date	Nov. 01, 2027	Nov. 01, 2027	Nov. 01, 2027	Nov. 01, 2027	Nov. 01, 2027
Investments, amortized cost	$ 13,664	$ 13,737
Investments, at fair value	11,844	13,843
Principal/Share Amount	$ 12,318	$ 12,411
Investment, Identifier [Axis]: Meta Buyer LLC, First lien Secured Term Loan, Floor 1.00%, Spread L plus 6.00%, Rate 7.33%, Due 11/1/2027
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:MetaBuyerLLCMember	whf:MetaBuyerLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Pharmaceuticals [Member]	Personal Products	Pharmaceuticals [Member]	Pharmaceuticals [Member]	Personal Products
Floor	1%	1%	1%	1%	1%
Spread Above Index	6%	6%	6%	6%	6%
Interest Rate	8.80%	7%	8.80%	8.80%	7%
Acquisition Date	Dec. 16, 2021	Dec. 16, 2021
Maturity Date	Nov. 01, 2027	Nov. 01, 2027	Nov. 01, 2027	Nov. 01, 2027	Nov. 01, 2027
Investments, amortized cost	$ 967	$ 972
Investments, at fair value	971	972
Principal/Share Amount	$ 984	$ 991
Investment, Identifier [Axis]: Mikawaya Holdings, LLC, First Lien Secured Term Loan, Floor 1.25%, Spread L plus 5.50%, Rate 6.75%, Due 1/29/2025
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]		whf:MikawayaHoldingsLLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Packaged Foods & Meats			Packaged Foods & Meats
Floor		1.25%			1.25%
Spread Above Index		5.50%			5.50%
Interest Rate		6.75%			6.75%
Acquisition Date		Feb. 18, 2020
Maturity Date		Jan. 29, 2025			Jan. 29, 2025
Investments, amortized cost		$ 2,988
Investments, at fair value		3,026
Principal/Share Amount		$ 3,026
Investment, Identifier [Axis]: Mills Fleet Farm Group, LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]		whf:MillsFleetFarmGroupLLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Department Stores			Department Stores
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Floor		1%			1%
Spread Above Index		6.25%			6.25%
Interest Rate		7.25%			7.25%
Acquisition Date		Oct. 24, 2018
Maturity Date		Oct. 24, 2024			Oct. 24, 2024
Investments, amortized cost		$ 13,331
Investments, at fair value		$ 13,538
Percent of net assets		3.87%			3.87%
Principal/Share Amount		$ 13,538
Investment, Restriction Status [true false]		true			true
Investment, Significant Unobservable Input [true false]		true			true
Investment, Identifier [Axis]: Motivational CIV, LLC Class B Units
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:MotivationalCIVLLCMember	whf:MotivationalCIVLLCMember
Investment, Type [Extensible Enumeration]	whf:ClassBUnitsMember	whf:ClassBUnitsMember	whf:ClassBUnitsMember	whf:ClassBUnitsMember	whf:ClassBUnitsMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Air Freight & Logistics	Air Freight & Logistics	Air Freight & Logistics	Air Freight & Logistics	Air Freight & Logistics
Acquisition Date	Jul. 12, 2021	Jul. 12, 2021
Investments, amortized cost	$ 1,250	$ 1,250
Investments, at fair value	$ 606	$ 1,250
Percent of net assets	0.18%	0.36%	0.18%	0.18%	0.36%
Principal/Share Amount	$ 1,250	$ 1,250
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Non-income Producing [true false]	false	false	false	false	false
Investment, Identifier [Axis]: Motivational Marketing, LLC First Lien Secured Revolving Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:MotivationalMarketingLLCMember	whf:MotivationalMarketingLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Air Freight & Logistics	Air Freight & Logistics	Air Freight & Logistics	Air Freight & Logistics	Air Freight & Logistics
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1%	1%	1%	1%	1%
Spread Above Index	6.25%	6.25%	6.25%	6.25%	6.25%
Interest Rate	9.07%	7.25%	9.07%	9.07%	7.25%
Acquisition Date	Jul. 12, 2021	Jul. 12, 2021
Maturity Date	Jul. 12, 2026	Jul. 12, 2026	Jul. 12, 2026	Jul. 12, 2026	Jul. 12, 2026
Investments, at fair value	$ (22)	$ 7
Percent of net assets	(0.01%)		(0.01%)	(0.01%)
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: Motivational Marketing, LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:MotivationalMarketingLLCMember	whf:MotivationalMarketingLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Air Freight & Logistics	Air Freight & Logistics	Air Freight & Logistics	Air Freight & Logistics	Air Freight & Logistics
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1%	1%	1%	1%	1%
Spread Above Index	6.25%	6.25%	6.25%	6.25%	6.25%
Interest Rate	9.07%	7.25%	9.07%	9.07%	7.25%
Acquisition Date	Jul. 12, 2021	Jul. 12, 2021
Maturity Date	Jul. 12, 2026	Jul. 12, 2026	Jul. 12, 2026	Jul. 12, 2026	Jul. 12, 2026
Investments, amortized cost	$ 10,956	$ 11,575
Investments, at fair value	$ 10,744	$ 11,646
Percent of net assets	3.13%	3.33%	3.13%	3.13%	3.33%
Principal/Share Amount	$ 11,124	$ 11,789
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: NMFC Senior Loan Program I LLC Units
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]		whf:ArcoleHoldingCorporationMember
Investment, Type [Extensible Enumeration]		Equity Investments			Equity Investments
Investments, at fair value						9,269
Investment, Identifier [Axis]: NNA Services, LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:NNAServicesLLCMember	whf:NNAServicesLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Diversified Support Services	Diversified Support Services	Diversified Support Services	Diversified Support Services	Diversified Support Services
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1%	1%	1%	1%	1%
Spread Above Index	6.75%	6.75%	6.75%	6.75%	6.75%
Interest Rate	10.42%	7.75%	10.42%	10.42%	7.75%
Acquisition Date	Aug. 27, 2021	Aug. 27, 2021
Maturity Date	Aug. 27, 2026	Aug. 27, 2026	Aug. 27, 2026	Aug. 27, 2026	Aug. 27, 2026
Investments, amortized cost	$ 11,264	$ 11,459
Investments, at fair value	$ 11,165	$ 11,460
Percent of net assets	3.25%	3.28%	3.25%	3.25%	3.28%
Principal/Share Amount	$ 11,375	$ 11,594
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: NPAV Lessor Corp., First Lien Secured Revolving Loan, Floor 1.00%, Spread SF plus 6.00%, Rate 7.60%, Due 1/21/2027
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:NPAVLessorCorp.Member
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember		whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	us-gaap:RealEstateSectorMember		us-gaap:RealEstateSectorMember	us-gaap:RealEstateSectorMember
Floor	1%		1%	1%
Spread Above Index	6%		6%	6%
Interest Rate	9.16%		9.16%	9.16%
Acquisition Date	Mar. 01, 2022
Maturity Date	Jan. 21, 2027		Jan. 21, 2027	Jan. 21, 2027
Investments, at fair value	$ (16)
Investment, Identifier [Axis]: NPAV Lessor Corp., First Lien Secured Term Loan, Floor 1.00%, Spread SF plus 6.00%, Rate 7.60%, Due 1/21/2027
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:NPAVLessorCorp.Member
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	us-gaap:RealEstateSectorMember		us-gaap:RealEstateSectorMember	us-gaap:RealEstateSectorMember
Floor	1%		1%	1%
Spread Above Index	6%		6%	6%
Interest Rate	9.16%		9.16%	9.16%
Acquisition Date	Mar. 01, 2022
Maturity Date	Jan. 21, 2027		Jan. 21, 2027	Jan. 21, 2027
Investments, amortized cost	$ 8,791
Investments, at fair value	8,588
Principal/Share Amount	$ 8,946
Investment, Identifier [Axis]: Naviga Inc First Lien Secured Revolving Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:NavigaIncMember	whf:NavigaIncMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Application Software	Application Software	Application Software	Application Software	Application Software
Investment, Variable Interest Rate, Type [Extensible Enumeration]	us-gaap:BaseRateMember	London Interbank Offered Rate (LIBOR) [Member]	us-gaap:BaseRateMember	us-gaap:BaseRateMember	London Interbank Offered Rate (LIBOR) [Member]
Floor	1%	1%	1%	1%	1%
Spread Above Index	6.92%	7%	6.92%	6.92%	7%
Interest Rate	10.28%	8%	10.28%	10.28%	8%
Acquisition Date	Jun. 14, 2019	Jun. 14, 2019
Maturity Date	Dec. 29, 2022	Dec. 29, 2022	Dec. 29, 2022	Dec. 29, 2022	Dec. 29, 2022
Investments, amortized cost	$ 267	$ 168
Investments, at fair value	$ 261	$ 169
Percent of net assets	0.08%	0.05%	0.08%	0.08%	0.05%
Principal/Share Amount	$ 267	$ 169
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: Naviga Inc First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:NavigaIncMember	whf:NavigaIncMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Application Software	Application Software	Application Software	Application Software	Application Software
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1%	1%	1%	1%	1%
Spread Above Index	7%	7%	7%	7%	7%
Interest Rate	10.67%	8%	10.67%	10.67%	8%
Acquisition Date	Jun. 14, 2019	Jun. 14, 2019
Maturity Date	Dec. 29, 2022	Dec. 29, 2022	Dec. 29, 2022	Dec. 29, 2022	Dec. 29, 2022
Investments, amortized cost	$ 3,184	$ 3,195
Investments, at fair value	$ 3,125	$ 3,213
Percent of net assets	0.91%	0.92%	0.91%	0.91%	0.92%
Principal/Share Amount	$ 3,189	$ 3,213
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: Nelson Worldwide, LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]		whf:NelsonWorldwideLLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Research & Consulting Services			Research & Consulting Services
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Floor		1%			1%
Spread Above Index		10.25%			10.25%
Interest Rate		11.25%			11.25%
Acquisition Date		Jan. 09, 2018
Maturity Date		Jan. 09, 2023			Jan. 09, 2023
Investments, amortized cost		$ 9,976
Investments, at fair value		$ 9,826
Percent of net assets		2.81%			2.81%
Principal/Share Amount		$ 10,027
Investment, Restriction Status [true false]		true			true
Investment, Significant Unobservable Input [true false]		true			true
Investment, Identifier [Axis]: PFB Holdco, Inc Class A Units
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:PFBHoldcoIncMember	whf:PFBHoldcoIncMember
Investment, Type [Extensible Enumeration]	whf:ClassAUnitsMember	whf:ClassAUnitsMember	whf:ClassAUnitsMember	whf:ClassAUnitsMember	whf:ClassAUnitsMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Building Products	Data Processing & Outsourced Services	Building Products	Building Products	Data Processing & Outsourced Services
Acquisition Date	Dec. 17, 2021	Dec. 17, 2021
Investments, amortized cost	$ 423	$ 423
Investments, at fair value	$ 603				$ 427
Percent of net assets	0.18%	0.12%	0.18%	0.18%	0.12%
Principal/Share Amount		$ 1	$ 1
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Non-income Producing [true false]	false	false	false	false	false
Investment, Identifier [Axis]: PFB Holdco, Inc First Lien Secured Revolving Loan Floor 2.45
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]		whf:PFBHoldcoIncMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredRevolvingLoanMember			whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Building Products			Building Products
Investment, Variable Interest Rate, Type [Extensible Enumeration]		whf:CanadaPrimeRateMember			whf:CanadaPrimeRateMember
Floor		2.45%			2.45%
Spread Above Index		5.50%			5.50%
Interest Rate		7.95%			7.95%
Acquisition Date		Dec. 17, 2021
Maturity Date		Dec. 17, 2026			Dec. 17, 2026
Investment, Restriction Status [true false]		true			true
Investment, Significant Unobservable Input [true false]		true			true
Investment, Identifier [Axis]: PFB Holdco, Inc First Lien Secured Revolving Loan Floor 3.25
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]		whf:PFBHoldcoIncMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredRevolvingLoanMember			whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Building Products			Building Products
Investment, Variable Interest Rate, Type [Extensible Enumeration]		us-gaap:PrimeRateMember			us-gaap:PrimeRateMember
Floor		3.25%			3.25%
Spread Above Index		5.50%			5.50%
Interest Rate		8.75%			8.75%
Acquisition Date		Dec. 17, 2021
Maturity Date		Dec. 17, 2026			Dec. 17, 2026
Investment, Restriction Status [true false]		true			true
Investment, Significant Unobservable Input [true false]		true			true
Investment, Identifier [Axis]: PFB Holdco, Inc First Lien Secured Term Loan CDOR
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments		Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:PFBHoldcoIncMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Building Products		Building Products	Building Products
Investment, Variable Interest Rate, Type [Extensible Enumeration]	CanadianDollarOfferedRateMember		CanadianDollarOfferedRateMember	CanadianDollarOfferedRateMember
Floor	1%		1%	1%
Spread Above Index	6%		6%	6%
Interest Rate	8.71%		8.71%	8.71%
Acquisition Date	Dec. 17, 2021
Maturity Date	Dec. 17, 2026		Dec. 17, 2026	Dec. 17, 2026
Investments, amortized cost	$ 6,889
Investments, at fair value	$ 6,382
Percent of net assets	1.85%		1.85%	1.85%
Principal/Share Amount			$ 8,959
Investment, Restriction Status [true false]	true		true	true
Investment, Significant Unobservable Input [true false]	true		true	true
Investment, Identifier [Axis]: PFB Holdco, Inc First Lien Secured Term Loan Floor 2.45
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]		whf:PFBHoldcoIncMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Building Products			Building Products
Investment, Variable Interest Rate, Type [Extensible Enumeration]		whf:CanadaPrimeRateMember			whf:CanadaPrimeRateMember
Floor		2.45%			2.45%
Spread Above Index		5.50%			5.50%
Interest Rate		7.95%			7.95%
Acquisition Date		Dec. 17, 2021
Maturity Date		Dec. 17, 2026			Dec. 17, 2026
Investments, amortized cost		$ 6,923
Investments, at fair value		$ 6,998
Percent of net assets		2%			2%
Principal/Share Amount		$ 9,027
Investment, Restriction Status [true false]		true			true
Investment, Identifier [Axis]: PFB Holdco, Inc First Lien Secured Term Loan Floor 3.25
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]		whf:PFBHoldcoIncMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Building Products			Building Products
Investment, Variable Interest Rate, Type [Extensible Enumeration]		us-gaap:PrimeRateMember			us-gaap:PrimeRateMember
Floor		3.25%			3.25%
Spread Above Index		5.50%			5.50%
Interest Rate		8.75%			8.75%
Acquisition Date		Dec. 17, 2021
Maturity Date		Dec. 17, 2026			Dec. 17, 2026
Investments, amortized cost		$ 2,154
Investments, at fair value		$ 2,154
Percent of net assets		0.62%			0.62%
Principal/Share Amount		$ 2,198
Investment, Restriction Status [true false]		true			true
Investment, Significant Unobservable Input [true false]		true			true
Investment, Identifier [Axis]: PFB Holdco, Inc. First Lien Secured Revolving Loan CDOR
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments		Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:PFBHoldcoIncMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember		whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Building Products		Building Products	Building Products
Investment, Variable Interest Rate, Type [Extensible Enumeration]	CanadianDollarOfferedRateMember		CanadianDollarOfferedRateMember	CanadianDollarOfferedRateMember
Floor	1%		1%	1%
Spread Above Index	6%		6%	6%
Interest Rate	8.71%		8.71%	8.71%
Acquisition Date	Dec. 17, 2021
Maturity Date	Dec. 17, 2026		Dec. 17, 2026	Dec. 17, 2026
Investments, at fair value	$ 2
Investment, Restriction Status [true false]	true		true	true
Investment, Significant Unobservable Input [true false]	true		true	true
Investment, Identifier [Axis]: PFB Holdco, Inc. First Lien Secured Revolving Loan LIBOR
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments		Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:PFBHoldcoIncMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember		whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Building Products		Building Products	Building Products
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]		London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1%		1%	1%
Spread Above Index	6%		6%	6%
Interest Rate	8.28%		8.28%	8.28%
Acquisition Date	Dec. 17, 2021
Maturity Date	Dec. 17, 2026		Dec. 17, 2026	Dec. 17, 2026
Investments, at fair value	$ 1
Investment, Restriction Status [true false]	true		true	true
Investment, Significant Unobservable Input [true false]	true		true	true
Investment, Identifier [Axis]: PFB Holdco, Inc. First Lien Secured Term Loan LIBOR
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments		Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:PFBHoldcoIncMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Building Products		Building Products	Building Products
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]		London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1%		1%	1%
Spread Above Index	6%		6%	6%
Interest Rate	8.28%		8.28%	8.28%
Acquisition Date	Dec. 17, 2021
Maturity Date	Dec. 17, 2026		Dec. 17, 2026	Dec. 17, 2026
Investments, amortized cost	$ 2,144
Investments, at fair value	$ 2,154
Percent of net assets	0.63%		0.63%	0.63%
Principal/Share Amount	$ 2,182
Investment, Restriction Status [true false]	true		true	true
Investment, Significant Unobservable Input [true false]	true		true	true
Investment, Identifier [Axis]: PG Dental New Jersey Parent, LLC First Lien Secured Revolving Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:PGDentalNewJerseyParentLLCMember	whf:PGDentalNewJerseyParentLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Health Care Services	Health Care Services	Health Care Services	Health Care Services	Health Care Services
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1%	1%	1%	1%	1%
Spread Above Index	9.75%	9.25%	9.75%	9.75%	9.25%
Interest Rate	12.57%	10.25%	12.57%	12.57%	10.25%
Acquisition Date	Nov. 25, 2020	Nov. 25, 2020
Maturity Date	Nov. 25, 2025	Nov. 25, 2025	Nov. 25, 2025	Nov. 25, 2025	Nov. 25, 2025
Investments, amortized cost	$ 347	$ 689
Investments, at fair value	$ 308	$ 631
Percent of net assets	0.09%	0.18%	0.09%	0.09%	0.18%
Principal/Share Amount	$ 352	$ 702
PIK interest rate	1.50%	1.50%	1.50%	1.50%	1.50%
Investment, interest rate, paid in cash	11.07%	8.75%	11.07%	11.07%	8.75%
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: PG Dental New Jersey Parent, LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:PGDentalNewJerseyParentLLCMember	whf:PGDentalNewJerseyParentLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Health Care Services	Health Care Services	Health Care Services	Health Care Services	Health Care Services
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1%	1%	1%	1%	1%
Spread Above Index	9.75%	9.25%	9.75%	9.75%	9.25%
Interest Rate	12.57%	10.25%	12.57%	12.57%	10.25%
Acquisition Date	Nov. 25, 2020	Nov. 25, 2020
Maturity Date	Nov. 25, 2025	Nov. 25, 2025	Nov. 25, 2025	Nov. 25, 2025	Nov. 25, 2025
Investments, amortized cost	$ 14,640	$ 15,178
Investments, at fair value	$ 13,807	$ 14,212
Percent of net assets	4.03%	4.06%	4.03%	4.03%	4.06%
Principal/Share Amount	$ 14,845	$ 15,448
PIK interest rate	1.50%	1.50%	1.50%	1.50%	1.50%
Investment, interest rate, paid in cash	11.07%	8.75%	11.07%	11.07%	8.75%
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: PPS CR Acquisition, Inc First Lien Secured Delayed Draw Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments		Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:PPSCRAcquisitionIncMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredDelayedDrawLoanMember		whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Heavy Electrical Equipment		Heavy Electrical Equipment	Heavy Electrical Equipment
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]		London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1%		1%	1%
Spread Above Index	6.25%		6.25%	6.25%
Interest Rate	9.92%		9.92%	9.92%
Acquisition Date	Jul. 11, 2022
Maturity Date	Jun. 25, 2026		Jun. 25, 2026	Jun. 25, 2026
Investments, at fair value	$ (1)
Investment, Restriction Status [true false]	true		true	true
Investment, Significant Unobservable Input [true false]	true		true	true
Investment, Identifier [Axis]: PPS CR Acquisition, Inc First Lien Secured Revolving Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:PPSCRAcquisitionIncMember	whf:PPSCRAcquisitionIncMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Heavy Electrical Equipment	Heavy Electrical Equipment	Heavy Electrical Equipment	Heavy Electrical Equipment	Heavy Electrical Equipment
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1%	1%	1%	1%	1%
Spread Above Index	6.25%	6.25%	6.25%	6.25%	6.25%
Interest Rate	9.92%	7.25%	9.92%	9.92%	7.25%
Acquisition Date	Jun. 25, 2021	Jun. 25, 2021
Maturity Date	Jun. 25, 2024	Jun. 25, 2024	Jun. 25, 2024	Jun. 25, 2024	Jun. 25, 2024
Investments, amortized cost	$ 103	$ 103
Investments, at fair value	$ 63	$ 113
Percent of net assets	0.02%	0.03%	0.02%	0.02%	0.03%
Principal/Share Amount	$ 104	$ 104
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: PPS CR Acquisition, Inc First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:PPSCRAcquisitionIncMember	whf:PPSCRAcquisitionIncMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Heavy Electrical Equipment	Heavy Electrical Equipment	Heavy Electrical Equipment	Heavy Electrical Equipment	Heavy Electrical Equipment
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1%	1%	1%	1%	1%
Spread Above Index	6.25%	6.25%	6.25%	6.25%	6.25%
Interest Rate	9.92%	7.25%	9.92%	9.92%	7.25%
Acquisition Date	Jun. 25, 2021	Jun. 25, 2021
Maturity Date	Jun. 25, 2026	Jun. 25, 2026	Jun. 25, 2026	Jun. 25, 2026	Jun. 25, 2026
Investments, amortized cost	$ 13,942	$ 10,924
Investments, at fair value	$ 13,835	$ 10,975
Percent of net assets	4.03%	3.14%	4.03%	4.03%	3.14%
Principal/Share Amount	$ 14,166	$ 11,123
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: PS Lightwave, Inc., First Lien Secured Delayed Draw Loan, Floor 1.50%, Spread L plus 6.75%, Rate 8.25%, Due 3/10/2025
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]		whf:PSLightwaveInc.Member
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredDelayedDrawLoanMember			whf:FirstLienSecuredDelayedDrawLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Technology Hardware, Storage & Peripherals			Technology Hardware, Storage & Peripherals
Floor		1.50%			1.50%
Spread Above Index		6.75%			6.75%
Interest Rate		8.25%			8.25%
Acquisition Date		May 19, 2020
Maturity Date		Mar. 10, 2025			Mar. 10, 2025
Investments, at fair value		$ 5
Investment, Identifier [Axis]: PS Lightwave, Inc., First Lien Secured Term Loan, Floor 1.50%, Spread L plus 6.75%, Rate 8.25%, Due 3/10/2025
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]		whf:PSLightwaveInc.Member
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Technology Hardware, Storage & Peripherals			Technology Hardware, Storage & Peripherals
Floor		1.50%			1.50%
Spread Above Index		6.75%			6.75%
Interest Rate		8.25%			8.25%
Acquisition Date		May 19, 2020
Maturity Date		Mar. 10, 2025			Mar. 10, 2025
Investments, amortized cost		$ 7,207
Investments, at fair value		7,230
Principal/Share Amount		$ 7,304
Investment, Identifier [Axis]: Patagonia Hold co Llc First Lien Secured Term Loans
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments		Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:PatagoniaHoldcoLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Alternative Carriers		Alternative Carriers	Alternative Carriers
Investment, Variable Interest Rate, Type [Extensible Enumeration]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]		Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
Floor	0.50%		0.50%	0.50%
Spread Above Index	5.75%		5.75%	5.75%
Interest Rate	8.39%		8.39%	8.39%
Acquisition Date	Aug. 05, 2022
Maturity Date	Aug. 01, 2029		Aug. 01, 2029	Aug. 01, 2029
Investments, amortized cost	$ 12,040
Investments, at fair value	$ 11,993
Percent of net assets	3.50%		3.50%	3.50%
Principal/Share Amount	$ 14,625
Investment, Restriction Status [true false]	true		true	true
Investment, Significant Unobservable Input [true false]	true		true	true
Investment, Identifier [Axis]: Pennsylvania Machine Works, LLC, First Lien Secured Term Loan, Floor 1.00%, Spread SF plus 6.25%, Rate 8.57%, Due 3/8/27
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:PennsylvaniaMachineWorksLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Industrial Machinery		Industrial Machinery	Industrial Machinery
Floor	1%		1%	1%
Spread Above Index	6.25%		6.25%	6.25%
Interest Rate	10.06%		10.06%	10.06%
Acquisition Date	Mar. 25, 2022
Maturity Date	Mar. 08, 2027		Mar. 08, 2027	Mar. 08, 2027
Investments, amortized cost	$ 6,833
Investments, at fair value	6,925
Principal/Share Amount	$ 6,925
Investment, Identifier [Axis]: PlayMonster LLC First Lien Secured Delayed Draw Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]		PlayMonster LLC [Member].
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredDelayedDrawLoanMember			whf:FirstLienSecuredDelayedDrawLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Leisure Products			Leisure Products
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Floor		1%			1%
Spread Above Index		6%			6%
Interest Rate		7%			7%
Acquisition Date		Jun. 07, 2021
Maturity Date		Jun. 07, 2026			Jun. 07, 2026
Investments, amortized cost		$ 221
Investments, at fair value		$ (828)
Percent of net assets		(0.24%)			(0.24%)
Principal/Share Amount		$ 224
Investment, Restriction Status [true false]		true			true
Investment, Significant Unobservable Input [true false]		true			true
Investment, Identifier [Axis]: PlayMonster LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	PlayMonster LLC [Member].	PlayMonster LLC [Member].
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Leisure Products			Leisure Products
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Floor		1%			1%
Spread Above Index		6%			6%
Interest Rate		7%			7%
Acquisition Date		Jun. 07, 2021
Maturity Date		Jun. 07, 2026			Jun. 07, 2026
Investments, amortized cost		$ 5,894
Investments, at fair value		$ 3,900
Percent of net assets		1.12%			1.12%
Principal/Share Amount		$ 6,000
Investment, Restriction Status [true false]		true			true
Investment, Significant Unobservable Input [true false]		true			true
Investment, Identifier [Axis]: Playmonster Group Equity Inc Common Equity
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:PlaymonsterGroupLLCMember
Investment, Type [Extensible Enumeration]	Common Stock [Member]		Common Stock [Member]	Common Stock [Member]
Investment, Identifier [Axis]: Playmonster Group Equity Inc Preferred Equity
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:PlaymonsterGroupLLCMember
Investment, Type [Extensible Enumeration]	us-gaap:PreferredStockMember		us-gaap:PreferredStockMember	us-gaap:PreferredStockMember
Investments, at fair value	$ 2,099
Investment, Identifier [Axis]: Playmonster Group Equity, Inc Common Stock
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	us-gaap-supplement:InvestmentAffiliatedIssuerMember		us-gaap-supplement:InvestmentAffiliatedIssuerMember	us-gaap-supplement:InvestmentAffiliatedIssuerMember
Investment, Issuer Name [Extensible Enumeration]	whf:PlaymonsterGroupEquityIncMember
Investment, Type [Extensible Enumeration]	Common Stock [Member]		Common Stock [Member]	Common Stock [Member]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Leisure Products		Leisure Products	Leisure Products
Acquisition Date	Jan. 24, 2022
Investments, amortized cost	$ 460
Principal/Share Amount	$ 72
Investment, Restriction Status [true false]	true		true	true
Investment, Significant Unobservable Input [true false]	true		true	true
Investment, Non-income Producing [true false]	false		false	false
Investment, Identifier [Axis]: Playmonster Group Equity, Inc. Preferred Stock
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	us-gaap-supplement:InvestmentAffiliatedIssuerMember		us-gaap-supplement:InvestmentAffiliatedIssuerMember	us-gaap-supplement:InvestmentAffiliatedIssuerMember
Investment, Issuer Name [Extensible Enumeration]	whf:PlaymonsterGroupEquityIncMember
Investment, Type [Extensible Enumeration]	us-gaap:PreferredStockMember		us-gaap:PreferredStockMember	us-gaap:PreferredStockMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Leisure Products		Leisure Products	Leisure Products
Spread Above Index	14%		14%	14%
Acquisition Date	Jan. 24, 2022
Investments, amortized cost	$ 3,600
Investments, at fair value	$ 2,099
Percent of net assets	0.62%		0.62%	0.62%
Principal/Share Amount	$ 36
PIK interest rate	14%		14%	14%
Investment, Restriction Status [true false]	true		true	true
Investment, Significant Unobservable Input [true false]	true		true	true
Investment, Non-income Producing [true false]	true		true	true
Investment, Identifier [Axis]: Playmonster Group LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	us-gaap-supplement:InvestmentAffiliatedIssuerMember		us-gaap-supplement:InvestmentAffiliatedIssuerMember	us-gaap-supplement:InvestmentAffiliatedIssuerMember
Investment, Issuer Name [Extensible Enumeration]	whf:PlaymonsterGroupLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Leisure Products		Leisure Products	Leisure Products
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]		London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1%		1%	1%
Spread Above Index	8%		8%	8%
Interest Rate	10.78%		10.78%	10.78%
Acquisition Date	Jan. 24, 2022
Maturity Date	Jun. 08, 2026		Jun. 08, 2026	Jun. 08, 2026
Investments, amortized cost	$ 3,565
Investments, at fair value	$ 3,509
Percent of net assets	1.02%		1.02%	1.02%
Principal/Share Amount	$ 3,565
PIK interest rate	8%		8%	8%
Investment, interest rate, paid in cash	2.78%		2.78%	2.78%
Investment, Restriction Status [true false]	true		true	true
Investment, Significant Unobservable Input [true false]	true		true	true
Interest issuer may Pay In Cash Or Cash And PIK	9%
Investment, Identifier [Axis]: Potpourri Group, Inc First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:PotpourriGroupIncMember	whf:PotpourriGroupIncMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Internet & Direct Marketing Retail	Internet & Direct Marketing Retail	Internet & Direct Marketing Retail	Internet & Direct Marketing Retail	Internet & Direct Marketing Retail
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1.50%	1.50%	1.50%	1.50%	1.50%
Spread Above Index	8.25%	8.25%	8.25%	8.25%	8.25%
Interest Rate	9.75%	9.75%	9.75%	9.75%	9.75%
Acquisition Date	Jul. 03, 2019	Jul. 03, 2019
Maturity Date	Jul. 03, 2024	Jul. 03, 2024	Jul. 03, 2024	Jul. 03, 2024	Jul. 03, 2024
Investments, amortized cost	$ 16,383	$ 16,955
Investments, at fair value	$ 16,513	$ 17,148
Percent of net assets	4.81%	4.90%	4.81%	4.81%	4.90%
Principal/Share Amount	$ 16,513	$ 17,148
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: Poultry Holdings LLC (HPP), First Lien Secured Term Loan, Floor 1.00%, Spread L plus 7.25%, Rate 8.25% (6.75% Cash + 1.50% PIK), Due 6/28/225
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:PoultryHoldingsLLCMember	whf:PoultryHoldingsLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Packaged Foods & Meats	Packaged Foods & Meats	Packaged Foods & Meats	Packaged Foods & Meats	Packaged Foods & Meats
Floor	1%	1%	1%	1%	1%
Spread Above Index	7.25%	7.25%	7.25%	7.25%	7.25%
Interest Rate	10.38%	8.25%	10.38%	10.38%	8.25%
Acquisition Date	Oct. 21, 2019	Oct. 21, 2019
Maturity Date	Jun. 28, 2025	Jun. 28, 2025	Jun. 28, 2025	Jun. 28, 2025	Jun. 28, 2025
Investments, amortized cost	$ 7,117	$ 7,676
Investments, at fair value	6,914	6,993
Principal/Share Amount	$ 7,183	$ 7,770
PIK interest rate	1.50%	1.50%	1.50%	1.50%	1.50%
Investment, interest rate, paid in cash	8.88%	6.75%	8.88%	8.88%	6.75%
Investment, Identifier [Axis]: Project Castle, Inc First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments		Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:ProjectCastleIncMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Industrial Machinery		Industrial Machinery	Industrial Machinery
Investment, Variable Interest Rate, Type [Extensible Enumeration]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]		Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
Floor	0.50%		0.50%	0.50%
Spread Above Index	5.50%		5.50%	5.50%
Interest Rate	9.05%		9.05%	9.05%
Acquisition Date	Jun. 09, 2022
Maturity Date	Jun. 01, 2029		Jun. 01, 2029	Jun. 01, 2029
Investments, amortized cost	$ 7,521
Investments, at fair value	$ 7,541
Percent of net assets	2.20%		2.20%	2.20%
Principal/Share Amount	$ 8,376
Investment, Restriction Status [true false]	true		true	true
Investment, Significant Unobservable Input [true false]	true		true	true
Investment, Identifier [Axis]: Quest Events, LLC Preferred Units
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:QuestEventsLLCMember	whf:QuestEventsLLCMember
Investment, Type [Extensible Enumeration]	whf:PreferredUnitsMember	whf:PreferredUnitsMember	whf:PreferredUnitsMember	whf:PreferredUnitsMember	whf:PreferredUnitsMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Diversified Support Services	Diversified Support Services	Diversified Support Services	Diversified Support Services	Diversified Support Services
Acquisition Date	Dec. 28, 2018	Dec. 28, 2018
Maturity Date	Dec. 08, 2025	Dec. 08, 2025	Dec. 08, 2025	Dec. 08, 2025	Dec. 08, 2025
Investments, amortized cost	$ 331	$ 317
Investments, at fair value	$ 60
Percent of net assets	0.02%		0.02%	0.02%
Principal/Share Amount	$ 331	$ 317
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Non-income Producing [true false]	false	true	false	false	true
Investment, Identifier [Axis]: Quest Events, LLC, First Lien Secured Revolving Loan, Floor 1.00%, Spread L plus 6.00%, Rate 7.00%, Due 12/28/2024
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:QuestEventsLLCMember	whf:QuestEventsLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Diversified Support Services	Diversified Support Services	Diversified Support Services	Diversified Support Services	Diversified Support Services
Floor	1%	1%	1%	1%	1%
Spread Above Index	6%	6%	6%	6%	6%
Interest Rate	9.67%	7%	9.67%	9.67%	7%
Acquisition Date	Jul. 19, 2019	Jul. 19, 2019
Maturity Date	Dec. 28, 2024	Dec. 28, 2024	Dec. 28, 2024	Dec. 28, 2024	Dec. 28, 2024
Investments, amortized cost	$ 464	$ 925
Investments, at fair value	424	760
Principal/Share Amount	$ 468	$ 935
Investment, Identifier [Axis]: Quest Events, LLC, First Lien Secured Term Loan, Floor 1.00%, Spread L plus 6.00%, Rate 7.00%, Due 12/28/2024
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:QuestEventsLLCMember	whf:QuestEventsLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Diversified Support Services	Diversified Support Services	Diversified Support Services	Diversified Support Services	Diversified Support Services
Floor	1%	1%	1%	1%	1%
Spread Above Index	6%	6%	6%	6%	6%
Interest Rate	9.67%	7%	9.67%	9.67%	7%
Acquisition Date	Jul. 19, 2019	Jul. 19, 2019
Maturity Date	Dec. 28, 2024	Dec. 28, 2024	Dec. 28, 2024	Dec. 28, 2024	Dec. 28, 2024
Investments, amortized cost	$ 11,838	$ 11,848
Investments, at fair value	11,317	9,729
Principal/Share Amount	$ 11,926	$ 11,966
Investment, Identifier [Axis]: RCKC Acquisitions LLC , First Lien Secured Delayed Draw Loan, Floor 1.00%, Spread L plus 6.25%, Rate 7.25%, Due 12/31/2026
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:RCKCAcquisitionsLLCMember	whf:RCKCAcquisitionsLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	IT Consulting And Other Services	IT Consulting And Other Services	IT Consulting And Other Services	IT Consulting And Other Services	IT Consulting And Other Services
Floor	1%	1%	1%	1%	1%
Spread Above Index	6.25%	6.25%	6.25%	6.25%	6.25%
Interest Rate	9.04%	7.25%	9.04%	9.04%	7.25%
Acquisition Date	Jan. 27, 2021	Jan. 27, 2021
Maturity Date	Dec. 31, 2026	Dec. 31, 2026	Dec. 31, 2026	Dec. 31, 2026	Dec. 31, 2026
Investments, amortized cost	$ 2,967
Investments, at fair value	2,969	$ (5)
Principal/Share Amount	$ 3,014
Investment, Identifier [Axis]: RCKC Acquisitions LLC , First Lien Secured Revolving Loan, Floor 1.00%, Spread L plus 6.25%, Rate 7.25%, Due 12/31/2026
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:RCKCAcquisitionsLLCMember	whf:RCKCAcquisitionsLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	IT Consulting And Other Services	IT Consulting And Other Services	IT Consulting And Other Services	IT Consulting And Other Services	IT Consulting And Other Services
Floor	1%	1%	1%	1%	1%
Spread Above Index	6.25%	6.25%	6.25%	6.25%	6.25%
Interest Rate	9.20%	7.25%	9.20%	9.20%	7.25%
Acquisition Date	Jan. 27, 2021	Jan. 27, 2021
Maturity Date	Dec. 31, 2026	Dec. 31, 2026	Dec. 31, 2026	Dec. 31, 2026	Dec. 31, 2026
Investments, amortized cost	$ 526	$ 804
Investments, at fair value	525	814
Principal/Share Amount	$ 533	$ 818
Investment, Identifier [Axis]: RCKC Acquisitions LLC , First Lien Secured Term Loan, Floor 1.00%, Spread L plus 6.25%, Rate 7.25%, Due 12/312026
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:RCKCAcquisitionsLLCMember	whf:RCKCAcquisitionsLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	IT Consulting And Other Services	IT Consulting And Other Services	IT Consulting And Other Services	IT Consulting And Other Services	IT Consulting And Other Services
Floor	1%	1%	1%	1%	1%
Spread Above Index	6.25%	6.25%	6.25%	6.25%	6.25%
Interest Rate	9.92%	7.25%	9.92%	9.92%	7.25%
Acquisition Date	Jan. 27, 2021	Jan. 27, 2021
Maturity Date	Dec. 31, 2026	Dec. 31, 2026	Dec. 31, 2026	Dec. 31, 2026	Dec. 31, 2026
Investments, amortized cost	$ 11,018	$ 11,074
Investments, at fair value	11,011	11,151
Principal/Share Amount	$ 11,179	$ 11,264
Investment, Identifier [Axis]: RLJ Pro-Vac, Inc. First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]		whf:RLJPro-VacInc.Member
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Environmental & Facilities Services			Environmental & Facilities Services
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Floor		1%			1%
Spread Above Index		6.25%			6.25%
Interest Rate		7.25%			7.25%
Acquisition Date		Dec. 31, 2021
Maturity Date		Dec. 31, 2026			Dec. 31, 2026
Investments, amortized cost		$ 8,600
Investments, at fair value		$ 8,600
Percent of net assets		2.46%			2.46%
Principal/Share Amount		$ 8,775
Investment, Restriction Status [true false]		true			true
Investment, Significant Unobservable Input [true false]		true			true
Investment, Identifier [Axis]: RLJ Pro-Vac, Inc. First Lien Secured Term Loan First Lien Secured Revolving Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]		whf:RLJPro-VacInc.Member
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredRevolvingLoanMember			whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Environmental & Facilities Services			Environmental & Facilities Services
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Floor		1%			1%
Spread Above Index		6.25%			6.25%
Interest Rate		7.25%			7.25%
Acquisition Date		Dec. 31, 2021
Maturity Date		Dec. 31, 2026			Dec. 31, 2026
Investment, Restriction Status [true false]		true			true
Investment, Significant Unobservable Input [true false]		true			true
Investment, Identifier [Axis]: Road Safety Services, First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]		whf:RoadSafetyServicesIncMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Construction & Engineering			Construction & Engineering
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Floor		1%			1%
Spread Above Index		6.50%			6.50%
Interest Rate		7.50%			7.50%
Acquisition Date		Dec. 30, 2021
Maturity Date		Mar. 18, 2025			Mar. 18, 2025
Investments, amortized cost		$ 4,017
Investments, at fair value		$ 4,017
Percent of net assets		1.15%			1.15%
Principal/Share Amount		$ 4,099
Investment, Restriction Status [true false]		true			true
Investment, Significant Unobservable Input [true false]		true			true
Investment, Identifier [Axis]: Road Safety Services, Inc., First Lien Secured Revolving Loan, Floor 3.25%, Spread P plus 5.50%, Rate 8.75%, Due 9/18/2023
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]		whf:RoadSafetyServicesIncMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredRevolvingLoanMember			whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Construction & Engineering			Construction & Engineering
Floor		3.25%			3.25%
Spread Above Index		5.50%			5.50%
Interest Rate		8.75%			8.75%
Acquisition Date		Dec. 31, 2019
Maturity Date		Sep. 18, 2023			Sep. 18, 2023
Investments, amortized cost		$ 489
Investments, at fair value		501
Principal/Share Amount		$ 496
Investment, Identifier [Axis]: Road Safety Services, Inc., First Lien Secured Term Loan, Floor 1.00%, Spread L plus 6.50%, Rate 7.50%, Due 3/18/2025
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:RoadSafetyServicesIncMember	whf:RoadSafetyServicesIncMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Construction & Engineering	Construction & Engineering	Construction & Engineering	Construction & Engineering	Construction & Engineering
Floor	1%	1%	1%	1%	1%
Spread Above Index	6.50%	6.50%	6.50%	6.50%	6.50%
Interest Rate	9.63%	7.50%	9.63%	9.63%	7.50%
Acquisition Date	Dec. 31, 2019	Dec. 31, 2019
Maturity Date	Mar. 18, 2025	Mar. 18, 2025	Mar. 18, 2025	Mar. 18, 2025	Mar. 18, 2025
Investments, amortized cost	$ 8,534	$ 6,340
Investments, at fair value	8,625	6,405
Principal/Share Amount	$ 8,625	$ 6,427
Investment, Identifier [Axis]: Ross-Simons Topco, LP Preferred Units
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:Ross-SimonsTopcoLPMember	whf:Ross-SimonsTopcoLPMember
Investment, Type [Extensible Enumeration]	whf:PreferredUnitsMember	whf:PreferredUnitsMember	whf:PreferredUnitsMember	whf:PreferredUnitsMember	whf:PreferredUnitsMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Internet & Direct Marketing Retail	Internet & Direct Marketing Retail	Internet & Direct Marketing Retail	Internet & Direct Marketing Retail	Internet & Direct Marketing Retail
Spread Above Index	8%	8%	8%	8%	8%
Acquisition Date	Dec. 04, 2020	Dec. 04, 2020
Investments, amortized cost	$ 514	$ 600
Investments, at fair value	$ 816	$ 786
Percent of net assets	0.24%	0.22%	0.24%	0.24%	0.22%
Principal/Share Amount	$ 600	$ 600
PIK interest rate	8%	8%	8%	8%	8%
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Non-income Producing [true false]	false	true	false	false	true
Investment, Identifier [Axis]: SFS Global Holding Company Warrants
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:SFSGlobalHoldingCompanyMember	whf:SFSGlobalHoldingCompanyMember
Investment, Type [Extensible Enumeration]	Warrant [Member]	Warrant [Member]	Warrant [Member]	Warrant [Member]	Warrant [Member]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Other Diversified Financial Services	Other Diversified Financial Services	Other Diversified Financial Services	Other Diversified Financial Services	Other Diversified Financial Services
Acquisition Date	Jun. 28, 2018	Jun. 28, 2018
Maturity Date	Dec. 28, 2025	Dec. 28, 2025	Dec. 28, 2025	Dec. 28, 2025	Dec. 28, 2025
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Non-income Producing [true false]	false	false	false	false	false
Investment, Identifier [Axis]: Sigue Corporation Warrants
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:SigueCorporationMember	whf:SigueCorporationMember
Investment, Type [Extensible Enumeration]	Warrant [Member]	Warrant [Member]	Warrant [Member]	Warrant [Member]	Warrant [Member]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Other Diversified Financial Services	Other Diversified Financial Services	Other Diversified Financial Services	Other Diversified Financial Services	Other Diversified Financial Services
Acquisition Date	Jun. 28, 2018	Jun. 28, 2018
Maturity Date	Dec. 28, 2025	Dec. 28, 2025	Dec. 28, 2025	Dec. 28, 2025	Dec. 28, 2025
Investments, amortized cost	$ 2,890	$ 2,890
Investments, at fair value	$ 3,823	$ 3,492
Percent of net assets	1.11%	1%	1.11%	1.11%	1%
Principal/Share Amount	$ 22	$ 22
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Non-income Producing [true false]	false	false	false	false	false
Investment, Identifier [Axis]: Sklar Holdings, Inc First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:SklarHoldingsIncMember	whf:SklarHoldingsIncMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Diversified Chemicals	Diversified Chemicals	Diversified Chemicals	Diversified Chemicals	Diversified Chemicals
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1%	1%	1%	1%	1%
Spread Above Index	9.75%	7.75%	9.75%	9.75%	7.75%
Interest Rate	10.75%	8.75%	10.75%	10.75%	8.75%
Acquisition Date	Nov. 13, 2019	Nov. 13, 2019
Maturity Date	May 13, 2023	May 13, 2023	May 13, 2023	May 13, 2023	May 13, 2023
Investments, amortized cost	$ 7,292	$ 7,295
Investments, at fair value	$ 6,695	$ 7,020
Percent of net assets	1.95%	2.01%	1.95%	1.95%	2.01%
Principal/Share Amount	$ 7,353	$ 7,389
PIK interest rate	2%		2%	2%
Investment, interest rate, paid in cash	8.75%		8.75%	8.75%
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: Sleep OpCo LLC First Lien Secured Revolving Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:SleepOpCoLLCMember	whf:SleepOpCoLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Home Furnishings	Home Furnishings	Home Furnishings	Home Furnishings	Home Furnishings
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1%	1%	1%	1%	1%
Spread Above Index	6.50%	6.50%	6.50%	6.50%	6.50%
Interest Rate	8.92%	7.50%	8.92%	8.92%	7.50%
Acquisition Date	Oct. 12, 2021	Oct. 12, 2021
Maturity Date	Oct. 12, 2026	Oct. 12, 2026	Oct. 12, 2026	Oct. 12, 2026	Oct. 12, 2026
Investments, at fair value	$ 10
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: Sleep OpCo LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:SleepOpCoLLCMember	whf:SleepOpCoLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Home Furnishings	Home Furnishings	Home Furnishings	Home Furnishings	Home Furnishings
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1%	1%	1%	1%	1%
Spread Above Index	6.50%	6.50%	6.50%	6.50%	6.50%
Interest Rate	8.92%	7.50%	8.92%	8.92%	7.50%
Acquisition Date	Oct. 12, 2021	Oct. 12, 2021
Maturity Date	Oct. 12, 2026	Oct. 12, 2026	Oct. 12, 2026	Oct. 12, 2026	Oct. 12, 2026
Investments, amortized cost	$ 20,555	$ 19,651
Investments, at fair value	$ 20,630	$ 19,645
Percent of net assets	6.01%	5.62%	6.01%	6.01%	5.62%
Principal/Share Amount	$ 20,895	$ 20,034
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: Smalto Inc., First Lien Secured Revolving Loan, Floor 1.00%, Spread E plus 6.00%, Rate 7.25%, Due 4/29/27
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:SmaltoInc.Member
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember		whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Household Appliances		Household Appliances	Household Appliances
Floor	1%		1%	1%
Spread Above Index	6.25%		6.25%	6.25%
Interest Rate	7.25%		7.25%	7.25%
Acquisition Date	May 04, 2022
Maturity Date	Apr. 29, 2027		Apr. 29, 2027	Apr. 29, 2027
Investments, amortized cost	$ 437
Investments, at fair value	396
Principal/Share Amount	$ 419
Investment, Identifier [Axis]: Smalto Inc., First Lien Secured Revolving Loan, Floor 1.00%, Spread SF plus 6.00%, Rate 7.25%, Due 4/29/27
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:SmaltoInc.Member
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember		whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Household Appliances		Household Appliances	Household Appliances
Floor	1%		1%	1%
Spread Above Index	6%		6%	6%
Interest Rate	8.68%		8.68%	8.68%
Acquisition Date	May 04, 2022
Maturity Date	Apr. 29, 2027		Apr. 29, 2027	Apr. 29, 2027
Investments, amortized cost	$ 17
Investments, at fair value	17
Principal/Share Amount	$ 17
Investment, Identifier [Axis]: Smalto Inc., First Lien Secured Term Loan, Floor 1.00%, Spread E plus 6.25%, Rate 7.25%, Due 4/28/28
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:SmaltoInc.Member
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Household Appliances		Household Appliances	Household Appliances
Floor	1%		1%	1%
Spread Above Index	6.25%		6.25%	6.25%
Interest Rate	7.25%		7.25%	7.25%
Acquisition Date	May 04, 2022
Maturity Date	Apr. 28, 2028		Apr. 28, 2028	Apr. 28, 2028
Investments, amortized cost	$ 6,876
Investments, at fair value	6,364
Principal/Share Amount	$ 6,659
Investment, Identifier [Axis]: Smalto Inc., First Lien Secured Term Loan, Floor 1.00%, Spread SF plus 6.00%, Rate 7.18%, Due 4/28/28
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:SmaltoInc.Member
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Household Appliances		Household Appliances	Household Appliances
Floor	1%		1%	1%
Spread Above Index	6%		6%	6%
Interest Rate	9.19%		9.19%	9.19%
Acquisition Date	May 04, 2022
Maturity Date	Apr. 28, 2028		Apr. 28, 2028	Apr. 28, 2028
Investments, amortized cost	$ 995
Investments, at fair value	996
Principal/Share Amount	$ 1,014
Investment, Identifier [Axis]: Snap Fitness Holdings, Inc Class A Common Stock
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:SnapFitnessHoldingsIncMember	whf:SnapFitnessHoldingsIncMember
Investment, Type [Extensible Enumeration]	us-gaap:CommonClassAMember	us-gaap:CommonClassAMember	us-gaap:CommonClassAMember	us-gaap:CommonClassAMember	us-gaap:CommonClassAMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Leisure Facilities	Leisure Facilities	Leisure Facilities	Leisure Facilities	Leisure Facilities
Acquisition Date	Jun. 29, 2020	Jun. 29, 2020
Investments, amortized cost	$ 1,941	$ 1,941
Investments, at fair value	$ 157	$ 188
Percent of net assets	0.05%	0.05%	0.05%	0.05%	0.05%
Principal/Share Amount	$ 2	$ 2
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Non-income Producing [true false]	false	false	false	false	false
Investment, Identifier [Axis]: Snap Fitness Holdings, Inc First Lien Secured Term Loan C
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:SnapFitnessHoldingsIncMember	whf:SnapFitnessHoldingsIncMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanCMember	whf:FirstLienSecuredTermLoanCMember	whf:FirstLienSecuredTermLoanCMember	whf:FirstLienSecuredTermLoanCMember	whf:FirstLienSecuredTermLoanCMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Leisure Facilities	Leisure Facilities	Leisure Facilities	Leisure Facilities	Leisure Facilities
Spread Above Index	9.50%	9.50%	9.50%	9.50%	9.50%
Interest Rate	9.50%	9.50%	9.50%	9.50%	9.50%
Acquisition Date	Jun. 29, 2020	Jun. 29, 2020
Investments, amortized cost	$ 1,265	$ 1,265
Investments, at fair value	$ 1,084	$ 1,219
Percent of net assets	0.32%	0.35%	0.32%	0.32%	0.35%
Principal/Share Amount	$ 1,268	$ 1,268
PIK interest rate	9.50%	9.50%	9.50%	9.50%	9.50%
Investment, interest rate, paid in cash	0%	0%	0%	0%	0%
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: Snap Fitness Holdings, Inc Warrants
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:SnapFitnessHoldingsIncMember	whf:SnapFitnessHoldingsIncMember
Investment, Type [Extensible Enumeration]	Warrant [Member]	Warrant [Member]	Warrant [Member]	Warrant [Member]	Warrant [Member]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Leisure Facilities	Leisure Facilities	Leisure Facilities	Leisure Facilities	Leisure Facilities
Acquisition Date	Jun. 29, 2020	Jun. 29, 2020
Maturity Date	Jun. 28, 2028	Jun. 28, 2028	Jun. 28, 2028	Jun. 28, 2028	Jun. 28, 2028
Investments, amortized cost	$ 793	$ 793
Investments, at fair value	$ 64	$ 76
Percent of net assets	0.02%	0.02%	0.02%	0.02%	0.02%
Principal/Share Amount	$ 1	$ 1
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Non-income Producing [true false]	false	false	false	false	false
Investment, Identifier [Axis]: Solar Holdings Bidco Limited First Lien Secured Delayed Draw Loan Interest Rate 8.94
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments		Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	Solar Holdings Bidco Limited
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredDelayedDrawLoanMember		whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Environmental & Facilities Services		Environmental & Facilities Services	Environmental & Facilities Services
Investment, Variable Interest Rate, Type [Extensible Enumeration]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]		Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
Floor	0.50%		0.50%	0.50%
Spread Above Index	6.75%		6.75%	6.75%
Interest Rate	9.74%		9.74%	9.74%
Acquisition Date	Sep. 30, 2022
Maturity Date	Sep. 28, 2029		Sep. 28, 2029	Sep. 28, 2029
Investments, at fair value	$ (10)
Investment, Restriction Status [true false]	true		true	true
Investment, Significant Unobservable Input [true false]	true		true	true
Investment, Identifier [Axis]: Solar Holdings Bidco Limited First Lien Secured Delayed Draw Loan Interest Rate 9.74
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments		Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	Solar Holdings Bidco Limited
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredDelayedDrawLoanMember		whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Environmental & Facilities Services		Environmental & Facilities Services	Environmental & Facilities Services
Investment, Variable Interest Rate, Type [Extensible Enumeration]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]		Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
Floor	0.50%		0.50%	0.50%
Spread Above Index	6.75%		6.75%	6.75%
Interest Rate	9.74%		9.74%	9.74%
Acquisition Date	Sep. 30, 2022
Maturity Date	Sep. 28, 2029		Sep. 28, 2029	Sep. 28, 2029
Investments, amortized cost	$ 51
Investments, at fair value	$ 51
Percent of net assets	0.01%		0.01%	0.01%
Principal/Share Amount	$ 53
Investment, Restriction Status [true false]	true		true	true
Investment, Significant Unobservable Input [true false]	true		true	true
Investment, Identifier [Axis]: Solar Holdings Bidco Limited First Lien Secured Term Loan CDOR
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments		Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	Solar Holdings Bidco Limited
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Environmental & Facilities Services		Environmental & Facilities Services	Environmental & Facilities Services
Investment, Variable Interest Rate, Type [Extensible Enumeration]	CanadianDollarOfferedRateMember		CanadianDollarOfferedRateMember	CanadianDollarOfferedRateMember
Floor	0.50%		0.50%	0.50%
Spread Above Index	6.75%		6.75%	6.75%
Interest Rate	10.92%		10.92%	10.92%
Acquisition Date	Sep. 30, 2022
Maturity Date	Sep. 28, 2029		Sep. 28, 2029	Sep. 28, 2029
Investments, amortized cost	$ 2,726
Investments, at fair value	$ 2,704
Percent of net assets	0.79%		0.79%	0.79%
Principal/Share Amount			$ 3,839
Investment, Restriction Status [true false]	true		true	true
Investment, Significant Unobservable Input [true false]	true		true	true
Investment, Identifier [Axis]: Solar Holdings Bidco Limited First Lien Secured Term Loan SF
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments		Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	Solar Holdings Bidco Limited
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Environmental & Facilities Services		Environmental & Facilities Services	Environmental & Facilities Services
Investment, Variable Interest Rate, Type [Extensible Enumeration]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]		Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
Floor	0.50%		0.50%	0.50%
Spread Above Index	6.75%		6.75%	6.75%
Interest Rate	9.74%		9.74%	9.74%
Acquisition Date	Sep. 30, 2022
Maturity Date	Sep. 28, 2029		Sep. 28, 2029	Sep. 28, 2029
Investments, amortized cost	$ 2,706
Investments, at fair value	$ 2,706
Percent of net assets	0.79%		0.79%	0.79%
Principal/Share Amount	$ 2,783
Investment, Restriction Status [true false]	true		true	true
Investment, Significant Unobservable Input [true false]	true		true	true
Investment, Identifier [Axis]: Solar Holdings Bidco Limited First Lien Secured Term Loan SONIA
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments		Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	Solar Holdings Bidco Limited
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Environmental & Facilities Services		Environmental & Facilities Services	Environmental & Facilities Services
Investment, Variable Interest Rate, Type [Extensible Enumeration]	whf:SterlingOvernightIndexAverageMember		whf:SterlingOvernightIndexAverageMember	whf:SterlingOvernightIndexAverageMember
Floor	0%		0%	0%
Spread Above Index	6.75%		6.75%	6.75%
Interest Rate	8.94%		8.94%	8.94%
Acquisition Date	Sep. 30, 2022
Maturity Date	Sep. 28, 2029		Sep. 28, 2029	Sep. 28, 2029
Investments, amortized cost	$ 182
Investments, at fair value	$ 184
Percent of net assets	0.05%		0.05%	0.05%
Principal/Share Amount | £				£ 169
Investment, Restriction Status [true false]	true		true	true
Investment, Significant Unobservable Input [true false]	true		true	true
Investment, Identifier [Axis]: Source Code Holdings, LLC , First Lien Secured Delayed Draw Loan, Floor 1.00%, Spread L plus 6.50%, Rate 7.50%, Due 7/30/2027
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]		whf:SourceCodeHoldingsLLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredDelayedDrawLoanMember			whf:FirstLienSecuredDelayedDrawLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Technology Hardware, Storage & Peripherals			Technology Hardware, Storage & Peripherals
Floor		1%			1%
Spread Above Index		6.50%			6.50%
Interest Rate		7.50%			7.50%
Acquisition Date		Aug. 10, 2021
Maturity Date		Jul. 30, 2027			Jul. 30, 2027
Investments, at fair value		$ 1
Investment, Identifier [Axis]: Source Code Holdings, LLC , First Lien Secured Term Loan, Floor 1.00%, Spread L plus 6.50%, Rate 7.50%, Due 7/30/2027
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]		whf:SourceCodeHoldingsLLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Technology Hardware, Storage & Peripherals			Technology Hardware, Storage & Peripherals
Floor		1%			1%
Spread Above Index		6.50%			6.50%
Interest Rate		7.50%			7.50%
Acquisition Date		Aug. 10, 2021
Maturity Date		Jul. 30, 2027			Jul. 30, 2027
Investments, amortized cost		$ 7,487
Investments, at fair value		7,489
Principal/Share Amount		$ 7,629
Investment, Identifier [Axis]: Source Code Holdings, LLC First Lien Secured Delayed Draw Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:SourceCodeHoldingsLLCMember	whf:SourceCodeHoldingsLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Technology Hardware, Storage & Peripherals	Technology Hardware, Storage & Peripherals	Technology Hardware, Storage & Peripherals	Technology Hardware, Storage & Peripherals	Technology Hardware, Storage & Peripherals
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Floor	1%	1%	1%	1%	1%
Spread Above Index	6.50%	6.50%	6.50%	6.50%	6.50%
Interest Rate	9.63%	7.50%	9.63%	9.63%	7.50%
Acquisition Date	Aug. 10, 2021	Jul. 30, 2021
Maturity Date	Jul. 30, 2027	Jul. 30, 2027	Jul. 30, 2027	Jul. 30, 2027	Jul. 30, 2027
Investments, at fair value	$ 21
Investment, Restriction Status [true false]		true			true
Investment, Significant Unobservable Input [true false]		true			true
Investment, Identifier [Axis]: Source Code Holdings, LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:SourceCodeHoldingsLLCMember	whf:SourceCodeHoldingsLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Technology Hardware, Storage & Peripherals	Technology Hardware, Storage & Peripherals	Technology Hardware, Storage & Peripherals	Technology Hardware, Storage & Peripherals	Technology Hardware, Storage & Peripherals
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Floor	1%	1%	1%	1%	1%
Spread Above Index	6.50%	6.50%	6.50%	6.50%	6.50%
Interest Rate	9.63%	7.50%	9.63%	9.63%	7.50%
Acquisition Date	Aug. 10, 2021	Jul. 30, 2021
Maturity Date	Jul. 30, 2027	Jul. 30, 2027	Jul. 30, 2027	Jul. 30, 2027	Jul. 30, 2027
Investments, amortized cost	$ 14,899	$ 7,487
Investments, at fair value	14,970	$ 7,489
Percent of net assets		2.14%			2.14%
Principal/Share Amount	$ 15,143	$ 7,629
Investment, Restriction Status [true false]		true			true
Investment, Significant Unobservable Input [true false]		true			true
Investment, Identifier [Axis]: Stella and Chewy's LLC, First Lien Secured Delayed Draw Loan, Floor 1.00%, Spread L plus 6.75%, Rate 7.75%, Due 12/16/2025
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:StellaandChewysLLCMember	whf:StellaandChewysLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Packaged Foods & Meats	Packaged Foods & Meats	Packaged Foods & Meats	Packaged Foods & Meats	Packaged Foods & Meats
Floor	1%	1%	1%	1%	1%
Spread Above Index	8.75%	6.75%	8.75%	8.75%	6.75%
Interest Rate	11.92%	7.75%	11.92%	11.92%	7.75%
Acquisition Date	Mar. 26, 2021	Dec. 29, 2020
Maturity Date	Dec. 16, 2025	Dec. 16, 2025	Dec. 16, 2025	Dec. 16, 2025	Dec. 16, 2025
Investments, amortized cost	$ 1,354	$ 1,877
Investments, at fair value	1,326	1,697
Principal/Share Amount	$ 1,367	$ 1,893
PIK interest rate	2%		2%	2%
Investment, interest rate, paid in cash	9.92%		9.92%	9.92%
Investment, Identifier [Axis]: Stella and Chewy's LLC, First Lien Secured Term Loan, Floor 1.00%, Spread L plus 6.75%, Rate 7.75%, Due 12/16/2025
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:StellaandChewysLLCMember	whf:StellaandChewysLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Packaged Foods & Meats	Packaged Foods & Meats	Packaged Foods & Meats	Packaged Foods & Meats	Packaged Foods & Meats
Floor	1%	1%	1%	1%	1%
Spread Above Index	8.75%	6.75%	8.75%	8.75%	6.75%
Interest Rate	12.24%	7.75%	12.24%	12.24%	7.75%
Acquisition Date	Dec. 29, 2020	Dec. 29, 2020
Maturity Date	Dec. 16, 2025	Dec. 16, 2025	Dec. 16, 2025	Dec. 16, 2025	Dec. 16, 2025
Investments, amortized cost	$ 3,826	$ 5,228
Investments, at fair value	3,758	4,967
Principal/Share Amount	$ 3,874	$ 5,313
PIK interest rate	2%		2%	2%
Investment, interest rate, paid in cash	10.24%		10.24%	10.24%
Investment, Identifier [Axis]: Sunless, Inc First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments		Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:SunlessInc.Member
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Personal Products		Personal Products	Personal Products
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]		London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1%		1%	1%
Spread Above Index	6.50%		6.50%	6.50%
Interest Rate	10.17%		10.17%	10.17%
Acquisition Date	Jun. 30, 2022
Maturity Date	Aug. 13, 2025		Aug. 13, 2025	Aug. 13, 2025
Investments, amortized cost	$ 2,053
Investments, at fair value	$ 2,063
Percent of net assets	0.60%		0.60%	0.60%
Principal/Share Amount	$ 2,092
Investment, Restriction Status [true false]	true		true	true
Investment, Significant Unobservable Input [true false]	true		true	true
Investment, Identifier [Axis]: Sunless, Inc., First Lien Secured Revolving Loan, Floor 1.00%, Spread L plus 6.00%, Rate 7.00%, Due 8/13/2024
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:SunlessInc.Member	whf:SunlessIncMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Personal Products	Personal Products	Personal Products	Personal Products	Personal Products
Floor	1%	1%	1%	1%	1%
Spread Above Index	6.50%	6%	6.50%	6.50%	6%
Interest Rate	10.17%	7%	10.17%	10.17%	7%
Acquisition Date	Oct. 21, 2019	Oct. 21, 2019
Maturity Date	Aug. 13, 2025	Aug. 13, 2024	Aug. 13, 2025	Aug. 13, 2025	Aug. 13, 2024
Investments, at fair value	$ 7	$ 14
Investment, Identifier [Axis]: Sunless, Inc., First Lien Secured Term Loan, Floor 1.00%, Spread L plus 6.00%, Rate 7.00%, Due 8/13/2024
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:SunlessInc.Member	whf:SunlessIncMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Personal Products	Personal Products	Personal Products	Personal Products	Personal Products
Floor	1%	1%	1%	1%	1%
Spread Above Index	6.50%	6%	6.50%	6.50%	6%
Interest Rate	10.17%	7%	10.17%	10.17%	7%
Acquisition Date	Oct. 21, 2019	Oct. 21, 2019
Maturity Date	Aug. 13, 2025	Aug. 13, 2024	Aug. 13, 2025	Aug. 13, 2025	Aug. 13, 2024
Investments, amortized cost	$ 3,639	$ 4,185
Investments, at fair value	3,691	4,259
Principal/Share Amount	$ 3,691	$ 4,259
Investment, Identifier [Axis]: Sure Fit Home Products, LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]		whf:SureFitHomeProductsLLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Home Furnishings			Home Furnishings
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Floor		1%			1%
Spread Above Index		9.75%			9.75%
Interest Rate		10.75%			10.75%
Acquisition Date		Apr. 12, 2021
Maturity Date		Jul. 13, 2023			Jul. 13, 2023
Investments, amortized cost		$ 4,828
Investments, at fair value		$ 4,372
Percent of net assets		1.25%			1.25%
Principal/Share Amount		$ 4,912
Investment, Restriction Status [true false]		true			true
Investment, Significant Unobservable Input [true false]		true			true
Investment, Identifier [Axis]: TOUR Intermediate Holdings, LLC, First Lien Secured Delayed Draw Loan, Floor 1.00%, Spread L plus 6.50%, Rate 7.50%, Due 5/15/2025
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:TOURIntermediateHoldingsLLCMember	whf:TOURIntermediateHoldingsLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Investment Banking & Brokerage	Investment Banking & Brokerage	Investment Banking & Brokerage	Investment Banking & Brokerage	Investment Banking & Brokerage
Floor	1%	1%	1%	1%	1%
Spread Above Index	6.50%	6.50%	6.50%	6.50%	6.50%
Interest Rate	9.62%	7.50%	9.62%	9.62%	7.50%
Acquisition Date	May 19, 2020	May 19, 2020
Maturity Date	May 15, 2025	May 15, 2025	May 15, 2025	May 15, 2025	May 15, 2025
Investments, amortized cost	$ 2,493	$ 2,600
Investments, at fair value	2,505	2,616
Principal/Share Amount	$ 2,505	$ 2,616
Investment, Identifier [Axis]: TOUR Intermediate Holdings, LLC, First Lien Secured Term Loan, Floor 1.00%, Spread L plus 6.50%, Rate 7.50%, Due 5/15/2025
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:TOURIntermediateHoldingsLLCMember	whf:TOURIntermediateHoldingsLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Investment Banking & Brokerage	Investment Banking & Brokerage	Investment Banking & Brokerage	Investment Banking & Brokerage	Investment Banking & Brokerage
Floor	1%	1%	1%	1%	1%
Spread Above Index	6.50%	6.50%	6.50%	6.50%	6.50%
Interest Rate	9.62%	7.50%	9.62%	9.62%	7.50%
Acquisition Date	May 19, 2020	May 19, 2020
Maturity Date	May 15, 2025	May 15, 2025	May 15, 2025	May 15, 2025	May 15, 2025
Investments, amortized cost	$ 3,150	$ 7,343
Investments, at fair value	3,182	7,438
Principal/Share Amount	$ 3,182	$ 7,438
Investment, Identifier [Axis]: Team Car Care Holdings, First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:TeamCarCareHoldingsLLCMember	whf:TeamCarCareHoldingsLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Automotive Retail	Automotive Retail	Automotive Retail	Automotive Retail	Automotive Retail
Investment, Variable Interest Rate, Type [Extensible Enumeration]	us-gaap:BaseRateMember	us-gaap:BaseRateMember	us-gaap:BaseRateMember	us-gaap:BaseRateMember	us-gaap:BaseRateMember
Floor	1%	1.03%	1%	1%	1.03%
Spread Above Index	7.98%	7.98%	7.98%	7.98%	7.98%
Interest Rate	10.39%	9.02%	10.39%	10.39%	9.02%
Acquisition Date	Feb. 16, 2018	Feb. 16, 2018
Maturity Date	Jun. 28, 2024	Jun. 28, 2024	Jun. 28, 2024	Jun. 28, 2024	Jun. 28, 2024
Investments, amortized cost	$ 14,532	$ 15,193
Investments, at fair value	$ 14,594	$ 15,286
Percent of net assets	4.25%	4.37%	4.25%	4.25%	4.37%
Principal/Share Amount	$ 14,594	$ 15,286
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: Telestream Holdings Corporation First Lien Secured Delayed Draw Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments		Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	Telestream Holdings Corporation [Member]
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredDelayedDrawLoanMember		whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Technology Hardware, Storage & Peripherals		Technology Hardware, Storage & Peripherals	Technology Hardware, Storage & Peripherals
Investment, Variable Interest Rate, Type [Extensible Enumeration]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]		Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
Floor	1%		1%	1%
Spread Above Index	9.25%		9.25%	9.25%
Interest Rate	12.30%		12.30%	12.30%
Acquisition Date	May 12, 2022
Maturity Date	Oct. 15, 2025		Oct. 15, 2025	Oct. 15, 2025
Investment, Restriction Status [true false]	true		true	true
Investment, Significant Unobservable Input [true false]	true		true	true
Investment, Identifier [Axis]: Telestream Holdings Corporation First Lien Secured Revolving Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	Telestream Holdings Corporation [Member]	Telestream Holdings Corporation [Member]
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Technology Hardware, Storage & Peripherals	Technology Hardware, Storage & Peripherals	Technology Hardware, Storage & Peripherals	Technology Hardware, Storage & Peripherals	Technology Hardware, Storage & Peripherals
Investment, Variable Interest Rate, Type [Extensible Enumeration]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	London Interbank Offered Rate (LIBOR) [Member]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1%	1%	1%	1%	1%
Spread Above Index	9.25%	8.75%	9.25%	9.25%	8.75%
Interest Rate	12.30%	9.75%	12.30%	12.30%	9.75%
Acquisition Date	Oct. 15, 2020	Oct. 15, 2020
Maturity Date	Oct. 15, 2025	Oct. 15, 2025	Oct. 15, 2025	Oct. 15, 2025	Oct. 15, 2025
Investments, amortized cost	$ 909	$ 517
Investments, at fair value	$ 935	$ 549
Percent of net assets	0.27%	0.16%	0.27%	0.27%	0.16%
Principal/Share Amount	$ 927	$ 530
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: Telestream Holdings Corporation First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	Telestream Holdings Corporation [Member]	Telestream Holdings Corporation [Member]
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Technology Hardware, Storage & Peripherals	Technology Hardware, Storage & Peripherals	Technology Hardware, Storage & Peripherals	Technology Hardware, Storage & Peripherals	Technology Hardware, Storage & Peripherals
Investment, Variable Interest Rate, Type [Extensible Enumeration]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	London Interbank Offered Rate (LIBOR) [Member]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1%	1%	1%	1%	1%
Spread Above Index	9.25%	8.75%	9.25%	9.25%	8.75%
Interest Rate	12.11%	9.75%	12.11%	12.11%	9.75%
Acquisition Date	Oct. 15, 2020	Oct. 15, 2020
Maturity Date	Oct. 15, 2025	Oct. 15, 2025	Oct. 15, 2025	Oct. 15, 2025	Oct. 15, 2025
Investments, amortized cost	$ 15,570	$ 14,713
Investments, at fair value	$ 15,874	$ 15,079
Percent of net assets	4.63%	4.31%	4.63%	4.63%	4.31%
Principal/Share Amount	$ 15,886	$ 15,079
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: Tensar Corporation First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]		whf:TensarCorporationMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Construction & Engineering			Construction & Engineering
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Floor		1%			1%
Spread Above Index		6.75%			6.75%
Interest Rate		7.75%			7.75%
Acquisition Date		Nov. 20, 2020
Maturity Date		Aug. 20, 2025			Aug. 20, 2025
Investments, amortized cost		$ 6,797
Investments, at fair value		$ 7,069
Percent of net assets		2.02%			2.02%
Principal/Share Amount		$ 6,930
Investment, Restriction Status [true false]		true			true
Investment, Significant Unobservable Input [true false]		true			true
Investment, Identifier [Axis]: Tensar Corporation, First Lien Secured Term Loan, Floor 1.00%, Spread L plus 6.75%, Rate 7.75%, Due 8/20/2025
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]		whf:TensarCorporationMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Construction & Engineering			Construction & Engineering
Floor		1%			1%
Spread Above Index		6.75%			6.75%
Interest Rate		7.75%			7.75%
Acquisition Date		Nov. 24, 2020
Maturity Date		Aug. 20, 2025			Aug. 20, 2025
Investments, amortized cost		$ 6,797
Investments, at fair value		7,069
Principal/Share Amount		$ 6,930
Investment, Identifier [Axis]: The Kyjen Company, LLC First Lien Secured Revolving Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:TheKyjenCompanyLLCMember	whf:TheKyjenCompanyLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Household Products	Household Products	Household Products	Household Products	Household Products
Investment, Variable Interest Rate, Type [Extensible Enumeration]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	London Interbank Offered Rate (LIBOR) [Member]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1%	1%	1%	1%	1%
Spread Above Index	7%	6.50%	7%	7%	6.50%
Interest Rate	9.88%	7.50%	9.88%	9.88%	7.50%
Acquisition Date	Apr. 05, 2021	Apr. 05, 2021
Maturity Date	Apr. 05, 2026	Apr. 05, 2026	Apr. 05, 2026	Apr. 05, 2026	Apr. 05, 2026
Investments, amortized cost	$ 669	$ 380
Investments, at fair value	$ 632	$ 390
Percent of net assets	0.18%	0.11%	0.18%	0.18%	0.11%
Principal/Share Amount	$ 676	$ 385
PIK interest rate	0.50%		0.50%	0.50%
Investment, interest rate, paid in cash	9.38%		9.38%	9.38%
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: The Kyjen Company, LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:TheKyjenCompanyLLCMember	whf:TheKyjenCompanyLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Household Products	Household Products	Household Products	Household Products	Household Products
Investment, Variable Interest Rate, Type [Extensible Enumeration]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	London Interbank Offered Rate (LIBOR) [Member]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1%	1%	1%	1%	1%
Spread Above Index	7%	6.50%	7%	7%	6.50%
Interest Rate	10.31%	7.50%	10.31%	10.31%	7.50%
Acquisition Date	Apr. 05, 2021	Apr. 05, 2021
Maturity Date	Apr. 05, 2026	Apr. 05, 2026	Apr. 05, 2026	Apr. 05, 2026	Apr. 05, 2026
Investments, amortized cost	$ 11,228	$ 11,257
Investments, at fair value	$ 10,782	$ 11,383
Percent of net assets	3.14%	3.25%	3.14%	3.14%	3.25%
Principal/Share Amount	$ 11,347	$ 11,403
PIK interest rate	0.50%		0.50%	0.50%
Investment, interest rate, paid in cash	9.81%		9.81%	9.81%
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: Token Buyer, Inc First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments		Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:TokenBuyerIncMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Household Appliances		Household Appliances	Household Appliances
Investment, Variable Interest Rate, Type [Extensible Enumeration]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]		Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
Floor	0.50%		0.50%	0.50%
Spread Above Index	6%		6%	6%
Interest Rate	9.70%		9.70%	9.70%
Acquisition Date	May 26, 2022
Maturity Date	May 31, 2029		May 31, 2029	May 31, 2029
Investments, amortized cost	$ 6,040
Investments, at fair value	$ 6,003
Percent of net assets	1.75%		1.75%	1.75%
Principal/Share Amount	$ 6,540
Investment, Restriction Status [true false]	true		true	true
Investment, Significant Unobservable Input [true false]	true		true	true
Investment, Identifier [Axis]: Trimlite Buyer LLC First Lien Secured Revolving Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]		whf:TrimliteBuyerLLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredRevolvingLoanMember			whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Building Products			Building Products
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Floor		1%			1%
Spread Above Index		6.50%			6.50%
Interest Rate		7.50%			7.50%
Acquisition Date		Jul. 27, 2021
Maturity Date		Jul. 27, 2026			Jul. 27, 2026
Investments, amortized cost		$ 161
Investments, at fair value		$ 161
Percent of net assets		0.05%			0.05%
Principal/Share Amount		$ 164
Investment, Restriction Status [true false]		true			true
Investment, Significant Unobservable Input [true false]		true			true
Investment, Identifier [Axis]: Trimlite Buyer LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:TrimliteBuyerLLCMember	whf:TrimliteBuyerLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Building Products	Building Products	Building Products	Building Products	Building Products
Investment, Variable Interest Rate, Type [Extensible Enumeration]	CanadianDollarOfferedRateMember	CanadianDollarOfferedRateMember	CanadianDollarOfferedRateMember	CanadianDollarOfferedRateMember	CanadianDollarOfferedRateMember
Floor	1%	1%	1%	1%	1%
Spread Above Index	6.50%	6.50%	6.50%	6.50%	6.50%
Interest Rate	10.67%	7.50%	10.67%	10.67%	7.50%
Acquisition Date	Jul. 27, 2021	Jul. 27, 2021
Maturity Date	Jul. 27, 2026	Jul. 27, 2026	Jul. 27, 2026	Jul. 27, 2026	Jul. 27, 2026
Investments, amortized cost	$ 17,681	$ 17,975
Investments, at fair value	$ 16,175	$ 17,841
Percent of net assets	4.72%	5.10%	4.72%	4.72%	5.10%
Principal/Share Amount		$ 22,977	$ 22,544
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: True Blue Car Wash, LLC First Lien Secured Delayed Draw Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:TrueBlueCarWashLLCMember	whf:TrueBlueCarWashLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Specialized Consumer Services	Specialized Consumer Services	Specialized Consumer Services	Specialized Consumer Services	Specialized Consumer Services
Investment, Variable Interest Rate, Type [Extensible Enumeration]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	London Interbank Offered Rate (LIBOR) [Member]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1%	1%	1%	1%	1%
Spread Above Index	6.50%	6.82%	6.50%	6.50%	6.82%
Interest Rate	9.55%	7.82%	9.55%	9.55%	7.82%
Acquisition Date	Oct. 17, 2019	Oct. 17, 2019
Maturity Date	Oct. 17, 2024	Oct. 17, 2024	Oct. 17, 2024	Oct. 17, 2024	Oct. 17, 2024
Investments, amortized cost	$ 4,124	$ 3,073
Investments, at fair value	$ 4,103	$ 3,098
Percent of net assets	1.20%	0.89%	1.20%	1.20%	0.89%
Principal/Share Amount	$ 4,186	$ 3,103
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: True Blue Car Wash, LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:TrueBlueCarWashLLCMember	whf:TrueBlueCarWashLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Specialized Consumer Services	Specialized Consumer Services	Specialized Consumer Services	Specialized Consumer Services	Specialized Consumer Services
Investment, Variable Interest Rate, Type [Extensible Enumeration]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	London Interbank Offered Rate (LIBOR) [Member]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1%	1%	1%	1%	1%
Spread Above Index	6.88%	6.82%	6.88%	6.88%	6.82%
Interest Rate	10.01%	7.82%	10.01%	10.01%	7.82%
Acquisition Date	Oct. 17, 2019	Oct. 17, 2019
Maturity Date	Oct. 17, 2024	Oct. 17, 2024	Oct. 17, 2024	Oct. 17, 2024	Oct. 17, 2024
Investments, amortized cost	$ 9,876	$ 8,087
Investments, at fair value	$ 9,898	$ 8,130
Percent of net assets	2.89%	2.32%	2.89%	2.89%	2.32%
Principal/Share Amount	$ 9,969	$ 8,203
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: Turnberry Solutions, Inc., First Lien Secured Revolving Loan, Floor 3.25%, Spread P plus 5.00%, Rate 8.25%, Due 9/2/2026
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:TurnberrySolutionsInc.Member	whf:TurnberrySolutionsInc.Member
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	IT Consulting And Other Services	IT Consulting And Other Services	IT Consulting And Other Services	IT Consulting And Other Services	IT Consulting And Other Services
Floor	1%	3.25%	1%	1%	3.25%
Spread Above Index	5%	5%	5%	5%	5%
Interest Rate	11.25%	8.25%	11.25%	11.25%	8.25%
Acquisition Date	Aug. 10, 2021	Aug. 10, 2021
Maturity Date	Sep. 02, 2026	Sep. 02, 2026	Sep. 02, 2026	Sep. 02, 2026	Sep. 02, 2026
Investments, amortized cost	$ 21	$ 84
Investments, at fair value	17	85
Principal/Share Amount	$ 22	$ 86
Investment, Identifier [Axis]: Turnberry Solutions, Inc., First Lien Secured Term Loan, Floor 1.00%, Spread L plus 6.00%, Rate 7.00%, Due 9/2/2026
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:TurnberrySolutionsInc.Member	whf:TurnberrySolutionsInc.Member
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	IT Consulting And Other Services	IT Consulting And Other Services	IT Consulting And Other Services	IT Consulting And Other Services	IT Consulting And Other Services
Floor	1%	1%	1%	1%	1%
Spread Above Index	6%	6%	6%	6%	6%
Interest Rate	9.19%	7%	9.19%	9.19%	7%
Acquisition Date	Aug. 10, 2021	Aug. 10, 2021
Maturity Date	Sep. 02, 2026	Sep. 02, 2026	Sep. 02, 2026	Sep. 02, 2026	Sep. 02, 2026
Investments, amortized cost	$ 6,008	$ 5,689
Investments, at fair value	5,973	5,684
Principal/Share Amount	$ 6,103	$ 5,791
Investment, Identifier [Axis]: Unleashed Brands, LLC, First Lien Secured Delayed Draw Loan, Floor 1.00%, Spread L plus 6.56%, Rate 7.17%, Due 11/19/2026
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:UnleashedBrandsLLCMember	whf:UnleashedBrandsLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Leisure Products	Leisure Products	Leisure Products	Leisure Products	Leisure Products
Floor	1%	1%	1%	1%	1%
Spread Above Index	5.50%	5.50%	5.50%	5.50%	5.50%
Interest Rate	8.62%	6.50%	8.62%	8.62%	6.50%
Acquisition Date	Nov. 30, 2021	Nov. 30, 2021
Maturity Date	Nov. 19, 2026	Nov. 19, 2026	Nov. 19, 2026	Nov. 19, 2026	Nov. 19, 2026
Investments, amortized cost	$ 5,091	$ 5,083
Investments, at fair value	5,151	5,082
Principal/Share Amount	$ 5,133	$ 5,133
Investment, Identifier [Axis]: Unleashed Brands, LLC, First Lien Secured Revolving Loan, Floor 1.00%, Spread L plus 6.56%, Rate 7.17%, Due 11/19/2026
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:UnleashedBrandsLLCMember	whf:UnleashedBrandsLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Leisure Products	Leisure Products	Leisure Products	Leisure Products	Leisure Products
Floor	1%	1%	1%	1%	1%
Spread Above Index	5.50%	5.50%	5.50%	5.50%	5.50%
Interest Rate	8.62%	6.50%	8.62%	8.62%	6.50%
Acquisition Date	Nov. 30, 2021	Nov. 30, 2021
Maturity Date	Nov. 19, 2026	Nov. 19, 2026	Nov. 19, 2026	Nov. 19, 2026	Nov. 19, 2026
Investments, at fair value	$ 6
Investment, Identifier [Axis]: Unleashed Brands, LLC, First lien Secured Term Loan, Floor 1.00%, Spread L plus 5.50%, Rate 7.17%, Due 11/19/2026
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:UnleashedBrandsLLCMember	whf:UnleashedBrandsLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Leisure Products	Leisure Products	Leisure Products	Leisure Products	Leisure Products
Floor	1%	1%	1%	1%	1%
Spread Above Index	5.50%	5.50%	5.50%	5.50%	5.50%
Interest Rate	8.62%	6.50%	8.62%	8.62%	6.50%
Acquisition Date	Nov. 30, 2021	Nov. 30, 2021
Maturity Date	Nov. 19, 2026	Nov. 19, 2026	Nov. 19, 2026	Nov. 19, 2026	Nov. 19, 2026
Investments, amortized cost	$ 3,854	$ 3,848
Investments, at fair value	3,887	3,848
Principal/Share Amount	$ 3,887	$ 3,887
Investment, Identifier [Axis]: WH Lessor Corp., First Lien Secured Revolving Loan, Floor 1.00%, Spread L plus 6.00%, Rate 7.00%, Due 12/26/2024
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:JuniperLandscapingHoldingsLLCMember	whf:WHLessorCorpMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Environmental & Facilities Services	Environmental & Facilities Services	Environmental & Facilities Services	Environmental & Facilities Services	Environmental & Facilities Services
Floor	1%	1%	1%	1%	1%
Spread Above Index	5.59%	6%	5.59%	5.59%	6%
Interest Rate	8.70%	7%	8.70%	8.70%	7%
Acquisition Date	Jan. 22, 2020	Jan. 22, 2020
Maturity Date	Dec. 26, 2024	Dec. 26, 2024	Dec. 26, 2024	Dec. 26, 2024	Dec. 26, 2024
Investments, at fair value	$ 5	$ 6
Investment, Identifier [Axis]: WH Lessor Corp., First Lien Secured Term Loan, Floor 1.00%, Spread L plus 6.00%, Rate 7.00%, Due 12/26/2024
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:JuniperLandscapingHoldingsLLCMember	whf:WHLessorCorpMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Environmental & Facilities Services	Environmental & Facilities Services	Environmental & Facilities Services	Environmental & Facilities Services	Environmental & Facilities Services
Floor	1%	1%	1%	1%	1%
Spread Above Index	5.59%	6%	5.59%	5.59%	6%
Interest Rate	8.70%	7%	8.70%	8.70%	7%
Acquisition Date	Jan. 22, 2020	Jan. 22, 2020
Maturity Date	Dec. 26, 2024	Dec. 26, 2024	Dec. 26, 2024	Dec. 26, 2024	Dec. 26, 2024
Investments, amortized cost	$ 7,412	$ 6,780
Investments, at fair value	7,489	6,866
Principal/Share Amount	$ 7,490	$ 6,870
Investment, Identifier [Axis]: WHF STRS Ohio Senior Loan Fund LLC Equity
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:WHFSTRSOhioSeniorLoanFundLLCMember	whf:WHFSTRSOhioSeniorLoanFundLLCMember
Investment, Type [Extensible Enumeration]	Equity Investments	Equity Investments	Equity Investments	Equity Investments	Equity Investments
Investments, at fair value	$ 22,066	$ 15,607				10,167
Investment, Identifier [Axis]: WHF STRS Ohio Senior Loan Fund LLC Interests
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Controlled affiliate company investments	Controlled affiliate company investments	Controlled affiliate company investments	Controlled affiliate company investments	Controlled affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:WHFSTRSOhioSeniorLoanFundMember	whf:WHFSTRSOhioSeniorLoanFundMember
Investment, Type [Extensible Enumeration]	whf:LLCInterestsMember	whf:LLCInterestsMember	whf:LLCInterestsMember	whf:LLCInterestsMember	whf:LLCInterestsMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Specialized Finance	Specialized Finance	Specialized Finance	Specialized Finance	Specialized Finance
Acquisition Date	Jul. 19, 2019	Jul. 19, 2019
Investments, amortized cost	$ 20,000	$ 15,000
Investments, at fair value	$ 22,066	$ 15,607
Percent of net assets	6.43%	4.46%	6.43%	6.43%	4.46%
Principal/Share Amount	$ 20,000	$ 15,000
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Non-income Producing [true false]	false	false	false	false	false
Investment, Identifier [Axis]: WHF STRS Ohio Senior Loan Fund LLC Subordinated Note
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Controlled affiliate company investments	Controlled affiliate company investments	Controlled affiliate company investments	Controlled affiliate company investments	Controlled affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:WHFSTRSOhioSeniorLoanFundLLCMember	whf:WHFSTRSOhioSeniorLoanFundLLCMember
Investment, Type [Extensible Enumeration]	Subordinated Debt [Member]	Subordinated Debt [Member]	Subordinated Debt [Member]	Subordinated Debt [Member]	Subordinated Debt [Member]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Specialized Finance	Specialized Finance	Specialized Finance	Specialized Finance	Specialized Finance
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Spread Above Index	6.50%	6.50%	6.50%	6.50%	6.50%
Interest Rate	9.13%	6.61%	9.13%	9.13%	6.61%
Acquisition Date	Jul. 19, 2019	Jul. 19, 2019
Investments, amortized cost	$ 80,000	$ 60,000
Investments, at fair value	$ 80,000	$ 60,000				$ 41,073
Percent of net assets	23.32%	17.16%	23.32%	23.32%	17.16%
Principal/Share Amount	$ 80,000	$ 60,000
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: Westrock Coffee Company, LLC, First Lien Secured Term Loan, Floor 1.50%, Spread L plus 8.50%, Rate Westrock Coffee Company, LLC, Due 2/28/2025
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]		whf:WestrockCoffeeCompanyLLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Packaged Foods & Meats			Packaged Foods & Meats
Floor		1.50%			1.50%
Spread Above Index		8.50%			8.50%
Interest Rate		10%			10%
Acquisition Date		Mar. 20, 2020
Maturity Date		Feb. 28, 2025			Feb. 28, 2025
Investments, amortized cost		$ 9,033
Investments, at fair value		8,923
Principal/Share Amount		$ 9,105
PIK interest rate		0.25%			0.25%
Investment, interest rate, paid in cash		9.75%			9.75%
Investment, Identifier [Axis]: What If Holdings, LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]		whf:WhatIfHoldingsLLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Interactive Media & Services			Interactive Media & Services
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Floor		1%			1%
Spread Above Index		6.50%			6.50%
Interest Rate		7.50%			7.50%
Acquisition Date		Oct. 02, 2019
Maturity Date		Oct. 02, 2024			Oct. 02, 2024
Investments, amortized cost		$ 18,609
Investments, at fair value		$ 18,759
Percent of net assets		5.36%			5.36%
Principal/Share Amount		$ 18,848
Investment, Restriction Status [true false]		true			true
Investment, Significant Unobservable Input [true false]		true			true
Investment, Identifier [Axis]: What If Media Group, LLC Common Units
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:WhatIfMediaGroupLLCMember	whf:WhatIfMediaGroupLLCMember
Investment, Type [Extensible Enumeration]	whf:CommonUnitsMember	whf:CommonUnitsMember	whf:CommonUnitsMember	whf:CommonUnitsMember	whf:CommonUnitsMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Interactive Media & Services	Interactive Media & Services	Interactive Media & Services	Interactive Media & Services	Interactive Media & Services
Acquisition Date	Jul. 02, 2021	Jul. 02, 2021
Investments, amortized cost	$ 851	$ 850
Investments, at fair value	$ 2,327	$ 1,398
Percent of net assets	0.68%	0.40%	0.68%	0.68%	0.40%
Principal/Share Amount	$ 851	$ 8
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Non-income Producing [true false]	false	false	false	false	false

ORGANIZATION

ORGANIZATION	9 Months Ended
	Sep. 30, 2022
ORGANIZATION
ORGANIZATION	​ NOTE 1 - ORGANIZATION WhiteHorse Finance, Inc. (“WhiteHorse Finance” and, together with its subsidiaries, the “Company”) is an externally managed, non-diversified, closed-end management investment company that has elected to be treated as a business development company under the Investment Company Act of 1940, as amended (the “1940 Act”). In addition, for tax purposes, WhiteHorse Finance elected to be treated as a regulated investment company (“RIC”) under Subchapter M of the Internal Revenue Code of 1986, as amended (the “Code”). WhiteHorse Finance’s common stock trades on the Nasdaq Global Select Market under the symbol “WHF.” The Company’s investment objective is to generate attractive risk-adjusted returns primarily by originating and investing in senior secured loans, including first lien and second lien facilities, to performing lower middle market companies across a broad range of industries that typically carry a floating interest index rate such as LIBOR or SOFR and have a term of three six WhiteHorse Finance’s investment activities are managed by H.I.G. WhiteHorse Advisers, LLC (“WhiteHorse Advisers” or the “Investment Adviser”). H.I.G. WhiteHorse Administration, LLC (“WhiteHorse Administration” or the “Administrator”) provides administrative services necessary for the Company to operate. Engaging in commodity interest transactions such as swap transactions or futures contracts for the Company may cause WhiteHorse Advisers to fall within the definition of “commodity pool operator” under the Commodity Exchange Act (the “CEA”) and related regulations promulgated by the U.S. Commodity Futures Trading Commission (the “CFTC”). On January 23, 2020, WhiteHorse Advisers claimed an exclusion from the definition of the term “commodity pool operator” under the CEA and the CFTC regulations in connection with its management of the Company (the “Exclusion”) and, therefore, WhiteHorse Advisers is not subject to CFTC registration or regulation under the CEA as a commodity pool operator with respect to its management of the Company. WhiteHorse Advisers has affirmed the Exclusion on February 17, 2022 and intends to continue to affirm the Exclusion on an annual basis.

SUMMARY OF SIGNIFICANT ACCOUNTI

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	9 Months Ended
	Sep. 30, 2022
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	NOTE 2 - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Basis of Presentation Financial Services - Investment Companies Additionally, the accompanying consolidated financial statements and related financial information have been prepared pursuant to the requirements for reporting on Form 10-K and Articles 6, 10 and 12 of Regulation S-X. In the opinion of management, the consolidated financial statements reflect all adjustments, consisting solely of normal recurring accruals considered necessary for the fair presentation of financial results as of and for the periods presented. Principles of Consolidation Use of Estimates Fair Value of Financial Instruments Fair Value Measurements and Disclosures. The Company values its investments in accordance with the 1940 Act and Rule 2a-5 thereunder, which sets forth the requirements for determining fair value in good faith. Pursuant to Rule 2a-5, the board of directors has designated the Investment Adviser to determine the fair value of the Company’s investments. The board of directors oversees the Investment Adviser’s performance of its valuation responsibilities, and in support of this oversight, the Investment Adviser provides periodic reports to the Company’s board of directors related to the fair valuation process. The Investment Adviser carries out its responsibilities as valuation designee primarily through its valuation committee (the “Valuation Committee”), assisted by third-party valuation firms, administrative personnel, and other service providers, as appropriate. The Valuation Committee consists of a number of representatives from different functions of the Investment Adviser. The Investment Adviser conducts the fair valuation process on a quarterly basis, subject to the oversight of the Company’s board of directors through the audit committee, using consistently applied valuation procedures. In accordance with the Company’s valuation procedures, the Investment Adviser performs periodic testing of the appropriateness and accuracy of fair value methodologies, and has established a process for approving, monitoring, and evaluating independent pricing service providers. Effective September 8, 2022, the board of directors designated the Investment Adviser as the Company’s valuation designee. Investments that are not publicly traded or for which market prices are not readily available will be valued based on the input of the Investment Adviser and independent third-party valuation firms engaged to review Company investments. These external reviews are used by the Company’s Investment Adviser, subject to the oversight of the board of directors, to review the Company’s internal valuation of investments during the year. Investment Transactions Foreign currency translation (1) cash and cash equivalents, restricted cash and cash equivalents, fair value of investments, interest receivable, and other assets and liabilities — at the spot exchange rate on the last business day of the period; and (2) purchases and sales of investments, income and expenses — at the exchange rates prevailing on the respective dates of such transactions. Although net assets and fair values are presented based on the applicable foreign exchange rates described above, the Company does not isolate that portion of the results of operations resulting from changes in foreign exchange rates on investments from the fluctuations arising from changes in fair values of investments held. Such fluctuations are included with the net realized and unrealized gain or loss from investments. Fluctuations arising from the translation of assets other than investments and liabilities are included with the net change in unrealized appreciation (depreciation) on translation of assets and liabilities in foreign currencies on the consolidated statements of operations. Foreign security and currency transactions may involve certain considerations and risks not typically associated with investing in U.S. companies. These risks include, but are not limited to, currency fluctuations and revaluations and future adverse political, social and economic developments, which could cause investments in foreign markets to be less liquid and prices to be more volatile than those of comparable U.S. companies or U.S. government securities. Revenue Recognition Sales Investment Income Dividend income is recorded on the record date for private portfolio companies or on the ex-dividend date for publicly traded portfolio companies. Closing fees associated with investments in portfolio companies are deferred and recognized as interest income over the respective terms of the applicable loans. Upon the prepayment of a loan or debt security, any unamortized loan closing fees are recorded as part of interest income. Commitment fees are based upon the undrawn portion committed by the Company and are recorded as interest income on an accrual basis. Prepayment, amendment and other fees are recognized when earned, generally when such fees are receivable, and are included in fee income on the consolidated statements of operations. The Company may invest in loans that contain a PIK interest rate provision. PIK interest is accrued at the contractual rates and added to loan principal on the reset dates to the extent such amounts are expected to be collected. Non-accrual loans Cash and Cash Equivalents Restricted Cash and Cash Equivalents Offering Costs Deferred Financing Costs the consolidated statements of assets and liabilities as a direct reduction from the carrying amount of the related debt liability. Income Taxes The Company recognizes the financial statement benefit of a tax position only after determining that the relevant tax authority would more-likely-than-not sustain the position following an audit. For tax positions meeting the more-likely-than-not threshold, the amount recognized in the financial statement is the largest benefit or expense that has a greater than 50% likelihood of being realized upon ultimate settlement with the relevant tax authority. Any tax positions not deemed to satisfy the more-likely-than-not threshold are reversed and recorded as tax benefit or tax expense, as appropriate, in the current year. Management has analyzed the Company’s tax positions, and the Company has concluded that the Company did not have any unrecognized tax benefits or unrecognized tax liabilities related to uncertain tax positions as of September 30, 2022 and December 31, 2021. Penalties or interest that may be assessed related to any income taxes would be classified as general and administrative expenses on the consolidated statements of operations. The Company had no amounts accrued for interest or penalties as of September 30, 2022 or December 31, 2021. The Company does not expect the total amount of unrecognized tax benefits to significantly change in the next twelve months. The Company’s tax returns are subject to examination by federal, state and local taxing authorities. Because many types of transactions are susceptible to varying interpretations under U.S. federal and state income tax laws and regulations, the amounts reported in the accompanying consolidated financial statements may be subject to change at a later date by the respective taxing authorities. Tax returns for each of the federal tax years since 2018 remain subject to examination by the Internal Revenue Service. As of September 30, 2022 and December 31, 2021, the cost of investments for federal income tax purposes was $776,044 and $835,502 resulting in net unrealized depreciation of $11,490 and $16,293, respectively. This is comprised of gross unrealized appreciation of $12,146 and $10,770 and gross unrealized depreciation of $23,636 and $27,062, on a tax basis, as of September 30, 2022 and December 31, 2021, respectively. Dividends and Distributions The Company maintains an “opt out” dividend reinvestment plan (“DRIP”) for common stockholders. As a result, if the Company declares a distribution or other dividend, stockholders’ cash distributions will be automatically reinvested in additional shares of common stock, unless they specifically “opt out” of the DRIP so as to receive cash distributions. Earnings per Share Risks and Uncertainties Market risk reflects changes in the value of investments due to changes in interest rates, spreads or other market factors, including the value of the collateral underlying investments held by the Company. Refer to “COVID-19 Developments” section in Note 8. Management believes that the carrying value of the Company’s investments are fairly stated, taking into consideration these risks along with estimated collateral values, payment histories and other market information. Reclassifications Recent Accounting Pronouncements Fair Value Measurement of Equity Securities Subject to Contractual Sale Restrictions In March 2020, the Financial Accounting Standards Board issued ASU 2020-04, Reference Rate Reform (Topic 848) Facilitation of the Effects of Reference Rate Reform on Financial Reporting

FORWARD CURRENCY CONTRACTS

FORWARD CURRENCY CONTRACTS	9 Months Ended
	Sep. 30, 2022
FORWARD CURRENCY CONTRACTS
FORWARD CURRENCY CONTRACTS	NOTE 3 - FORWARD CURRENCY CONTRACTS The Company may enter into foreign currency forward contracts from time to time to facilitate settlement of purchases and sales of investments denominated in foreign currencies and to economically hedge the impact that an adverse change in foreign exchange rates would have on the value of the Company’s investments denominated in foreign currencies. A foreign currency forward contract is a commitment to purchase or sell a foreign currency at a future date at a negotiated forward rate. These contracts are marked-to-market by recognizing the difference between the contract forward exchange rate and the forward market exchange rate on the last day of the period presented as unrealized appreciation or depreciation. Realized gains or losses are recognized when forward contracts are settled. Risks arise as a result of the potential inability of the counterparties to meet the terms of their contracts. The Company attempts to limit counterparty risk by only dealing with well-known counterparties. The Company utilizes forward foreign currency exchange contracts to protect itself against fluctuations in exchange rates. The Company may choose to renew contracts quarterly unless otherwise settled by the Company or the counterparty. The following table provides a breakdown of our forward currency contracts for the three and nine months ended September 30, 2022 and 2021: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three months ended September 30, ​ ​ Nine months ended September 30, ​ ​ ​ 2022 ​ ​ 2021 ​ 2022 ​ ​ 2021 Realized gain (loss) on forward currency contracts ​ $ — ​ $ 1 ​ $ (8) ​ $ (3) Unrealized appreciation (depreciation) on forward currency contracts ​ ​ 10 ​ ​ 187 ​ ​ 10 ​ ​ 186 Total net realized and unrealized gains (losses) on forward currency contracts ​ $ 10 ​ $ 188 ​ $ 2 ​ $ 183 ​ The value associated with unrealized gain or loss on open contracts is included in unrealized appreciation or depreciation on forward currency contracts within the consolidated statements of assets and liabilities. Open contracts as of September 30, 2022 were as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Counterparty Currency to be sold Currency to be purchased Settlement date Unrealized appreciation Unrealized depreciation Morgan Stanley ​ C$ 199 CAD ​ $ 155 USD ​ 10/28/22 ​ $ 10 ​ $ — Total ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ $ 10 ​ $ — ​ The following table is a summary of the average USD notional exposure to foreign currency forward contracts for the three and nine months ended September 30, 2022 and 2021: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three months ended September 30, ​ Nine months ended September 30, Average USD notional outstanding ​ 2022 ​ ​ 2021 ​ 2022 ​ ​ 2021 Forward currency contracts ​ $ 125 ​ $ 13,980 ​ $ 186 ​ $ 4,754 ​ The foreign currency forward contracts open at the end of the period are generally indicative of the volume of activity during the period. The value associated with unrealized gain or loss on open contracts is included in unrealized appreciation or depreciation on forward currency contracts within the consolidated statements of assets and liabilities. Offsetting of Derivative Instruments The Company has derivative instruments that are subject to master netting agreements. These agreements include provisions to offset positions with the same counterparty in the event of default by one of the parties. The Company’s unrealized appreciation or depreciation on derivative instruments are reported as gross assets and liabilities, respectively, in the consolidated statements of assets and liabilities. The following tables present the Company’s assets and liabilities related to derivatives by counterparty, net of amounts available for offset under a master netting arrangement and net of any collateral received or pledged by the Company for such assets and liabilities as of September 30, 2022. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ As of September 30, 2022 Counterparty ($ in thousands) Derivative Assets Subject to Master Netting Agreement Derivative Liabilities Subject to Master Netting Agreement Derivatives Available for Offset Non-cash Collateral Received Non-cash Collateral Pledged (1) Cash Collateral Received (1) Cash Collateral Pledged (1) Net Amount of Derivative Assets (2) Net Amount of Derivative Liabilities (3) Morgan Stanley ​ $ 10 ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ 10 ​ $ — Total ​ $ 10 ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ 10 ​ $ — ​ (1) In some instances, the actual amount of the collateral received and/or pledged may be more than the amount shown due to overcollateralization. (2) Net amount of derivative assets represents the net amount due from the counterparty to the Company in the event of default. (3) Net amount of derivative liabilities represents the net amount due from the Company to the counterparty in the event of default. ​ As of December 31, 2021, the Company did not have any outstanding derivative instruments.

INVESTMENTS

INVESTMENTS	9 Months Ended
	Sep. 30, 2022
INVESTMENTS
INVESTMENTS	NOTE 4 - INVESTMENTS Investments consisted of the following: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ As of September 30, 2022 ​ As of December 31, 2021 ​ Amortized Cost Fair Value Amortized Cost Fair Value First lien secured loans ​ $ 622,517 ​ $ 615,945 ​ $ 709,318 ​ $ 697,232 Second lien secured loans ​ 24,529 ​ 20,383 ​ 25,484 ​ 23,650 Subordinated unsecured loans ​ ​ 167 ​ 167 ​ ​ 167 ​ 167 Subordinated Note to STRS JV ​ 80,000 ​ 80,000 ​ 60,000 ​ 60,000 Equity (excluding STRS JV) ​ 26,193 ​ 25,993 ​ 21,991 ​ 22,552 Equity in STRS JV ​ 20,000 ​ 22,066 ​ 15,000 ​ 15,607 Total ​ $ 773,406 ​ $ 764,554 ​ $ 831,960 ​ $ 819,208 ​ ​ The following table shows the portfolio composition by industry grouping at fair value: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Industry ($ in thousands) ​ As of September 30, 2022 ​ As of December 31, 2021 ​ Advertising $ 219 — % $ 9,738 1.3 % Air Freight & Logistics ​ ​ 16,046 ​ 2.4 ​ ​ 21,379 ​ 2.9 ​ Alternative Carriers ​ ​ 11,993 ​ 1.8 ​ ​ — ​ — ​ Application Software ​ ​ 18,145 ​ 2.7 ​ ​ 22,590 ​ 3.0 ​ Asset Management & Custody Banks ​ ​ 10,169 ​ 1.5 ​ ​ — ​ — ​ Automotive Retail ​ ​ 14,594 ​ 2.2 ​ ​ 15,286 ​ 2.1 ​ Broadcasting ​ ​ 7,942 ​ 1.2 ​ ​ 8,027 ​ 1.1 ​ Building Products ​ ​ 25,317 ​ 3.8 ​ ​ 44,184 ​ 5.9 ​ Cable & Satellite ​ ​ 14,323 ​ 2.2 ​ ​ 14,526 ​ 2.0 ​ Commodity Chemicals ​ ​ 16,003 ​ 2.4 ​ ​ 15,172 ​ 2.0 ​ Construction & Engineering ​ ​ — ​ — ​ ​ 11,086 ​ 1.5 ​ Construction Materials ​ ​ 8,168 ​ 1.2 ​ ​ 7,673 ​ 1.0 ​ Consumer Finance ​ ​ — ​ — ​ ​ 9,628 ​ 1.3 ​ Data Processing & Outsourced Services ​ ​ 43,387 ​ 6.5 ​ ​ 32,864 ​ 4.4 ​ Department Stores ​ ​ — ​ — ​ ​ 13,538 ​ 1.8 ​ Distributors ​ ​ 3,618 ​ 0.5 ​ ​ 4,025 ​ 0.5 ​ Diversified Chemicals ​ ​ 13,941 ​ 2.1 ​ ​ 18,360 ​ 2.5 ​ Diversified Support Services ​ ​ 11,309 ​ 1.7 ​ ​ 11,618 ​ 1.6 ​ Education Services ​ ​ 13,403 ​ 2.0 ​ ​ 13,398 ​ 1.8 ​ Electric Utilities ​ ​ 10,408 ​ 1.6 ​ ​ 10,296 ​ 1.4 ​ Electronic Equipment & Instruments ​ ​ — ​ — ​ ​ 6,687 ​ 0.9 ​ Environmental & Facilities Services ​ ​ 18,769 ​ 2.8 ​ ​ 32,998 ​ 4.4 ​ Health Care Facilities ​ ​ 10,318 ​ 1.6 ​ ​ 25,576 ​ 3.4 ​ Health Care Services ​ ​ 32,756 ​ 4.9 ​ ​ 58,055 ​ 7.8 ​ Health Care Supplies ​ ​ 23,354 ​ 3.5 ​ ​ — ​ — ​ Heavy Electrical Equipment ​ ​ 13,897 ​ 2.1 ​ ​ 11,088 ​ 1.5 ​ Home Furnishings ​ ​ 25,311 ​ 3.8 ​ ​ 24,017 ​ 3.2 ​ Household Appliances ​ ​ 6,003 ​ 0.9 ​ ​ — ​ — ​ Household Products ​ ​ 11,414 ​ 1.7 ​ ​ 11,773 ​ 1.6 ​ Industrial Machinery ​ ​ 8,209 ​ 1.2 ​ ​ — ​ — ​ Interactive Media & Services ​ ​ 10,260 ​ 1.5 ​ ​ 20,157 ​ 2.7 ​ Internet & Direct Marketing Retail ​ ​ 40,312 ​ 6.1 ​ ​ 45,668 ​ 6.1 ​ Investment Banking & Brokerage ​ ​ 18,372 ​ 2.8 ​ ​ 19,603 ​ 2.6 ​ IT Consulting & Other Services ​ ​ 15,471 ​ 2.3 ​ ​ 19,162 ​ 2.6 ​ Leisure Facilities ​ ​ 22,089 ​ 3.3 ​ ​ 22,142 ​ 3.0 ​ Leisure Products ​ ​ 5,608 ​ 0.9 ​ ​ 3,072 ​ 0.4 ​ Life Sciences Tools & Services ​ ​ 4,912 ​ 0.8 ​ ​ 4,925 ​ 0.7 ​ Office Services & Supplies ​ ​ 25,039 ​ 3.8 ​ ​ 20,921 ​ 2.8 ​ Other Diversified Financial Services ​ ​ 3,823 ​ 0.7 ​ ​ 3,492 ​ 0.5 ​ Packaged Foods & Meats ​ ​ 10,922 ​ 1.6 ​ ​ 10,862 ​ 1.5 ​ Paper Packaging ​ ​ 8,499 ​ 1.4 ​ ​ — ​ — ​ Personal Products ​ ​ 13,566 ​ 2.1 ​ ​ 12,260 ​ 1.6 ​ Real Estate Operating Companies ​ ​ — ​ — ​ ​ 5,431 ​ 0.7 ​ Research & Consulting Services ​ ​ 22,316 ​ 3.4 ​ ​ 23,822 ​ 3.2 ​ Specialized Consumer Services ​ ​ 37,949 ​ 5.7 ​ ​ 36,225 ​ 4.9 ​ Specialized Finance (1) ​ ​ — ​ — ​ ​ — ​ — ​ Systems Software ​ ​ 17,525 ​ 2.7 ​ ​ 19,160 ​ 2.6 ​ Technology Hardware, Storage & Peripherals ​ ​ 16,809 ​ 2.6 ​ ​ 23,117 ​ 3.1 ​ Total (1) ​ $ 662,488 ​ 100.0 % $ 743,601 ​ 100.0 % (1) Excludes investments in STRS JV. As of September 30, 2022, the portfolio companies underlying the investments are all located in the United States and its territories, except for JZ Capital Partners Ltd., which is domiciled in Guernsey, Solar Holdings Bidco Limited, which is domiciled in the United Kingdom, and Arcole Acquisition Corp and Trimlite Buyer, LLC, which are domiciled in Canada. As of September 30, 2022 and December 31, 2021, the weighted average remaining term of the Company’s debt investments, excluding non-accrual investments, were approximately 3.5 years and 3.8 years, respectively. ​ As of September 30, 2022 there were no loans on non-accrual status. As of December 31, 2021, the total fair value of non-accrual loans was $10,046. ​ An affiliated company is generally a portfolio company in which the Company owns 5% or more of its voting securities. A controlled affiliated company is generally a portfolio company in which the Company owns more than 25% of its voting securities or has the power to exercise control over its management or policies (including through a management agreement). The following table presents the schedule of investments in and advances to affiliated and controlled persons (as defined by the 1940 Act) as of and for the nine months ended September 30, 2022: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Dividends and ​ Beginning ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Net Change in ​ Ending Fair ​ ​ ​ ​ interest ​ Fair Value at ​ ​ ​ ​ ​ ​ ​ Net ​ Unrealized ​ Value at ​ ​ Type of ​ included in ​ December 31, ​ ​ ​ ​ ​ ​ ​ Realized ​ Appreciation ​ September 30, Affiliated Person (1) ​ Asset income 2021 Purchases Sales Gain (Loss) (Depreciation) 2022 Non-controlled affiliates ​ ​ ​ ​ ​ ​ ​ ​ Arcole Holding Corporation ​ Equity ​ $ 261 ​ $ 6,874 ​ $ — ​ $ — ​ $ — ​ $ (579) ​ $ 6,295 PlayMonster LLC ​ First Lien Secured Revolving Loan ​ 13 ​ — ​ 1,088 ​ (1,088) ​ — ​ — ​ — Playmonster Group LLC ​ First Lien Secured Loan ​ 215 ​ — ​ 3,565 ​ — ​ — ​ (56) ​ 3,509 Playmonster Group Equity, Inc. (d/b/a PlayMonster) ​ Preferred Equity ​ — ​ — ​ 3,600 ​ — ​ — ​ (1,501) ​ 2,099 Playmonster Group Equity, Inc. (d/b/a PlayMonster) ​ Common Equity ​ — ​ — ​ 460 ​ — ​ — ​ (460) ​ — Total Non-controlled affiliates ​ ​ ​ $ 489 ​ $ 6,874 ​ $ 8,713 ​ $ (1,088) ​ $ — ​ $ (2,596) ​ $ 11,903 Controlled affiliates ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ WHF STRS Ohio Senior Loan Fund LLC* Subordinated Note ​ $ 4,339 ​ $ 60,000 ​ $ 20,000 ​ $ — ​ $ — ​ $ — ​ $ 80,000 WHF STRS Ohio Senior Loan Fund LLC* Equity ​ 5,042 ​ 15,607 ​ 5,000 ​ — ​ — ​ 1,459 ​ 22,066 Total Controlled affiliates ​ $ 9,381 ​ $ 75,607 ​ $ 25,000 ​ $ — ​ $ — ​ $ 1,459 ​ $ 102,066 * The Company and STRS Ohio are the members of STRS JV, a joint venture formed as a Delaware limited liability company that is not consolidated by either member for financial reporting purposes. The members make investments in STRS JV in the form of limited liability company (“LLC”) equity interests and interest-bearing subordinated notes as STRS JV makes investments, and all portfolio and other material decisions regarding STRS JV must be submitted to STRS JV’s board of managers which is comprised of an equal number of members appointed by each of the Company and STRS Ohio. Because management of STRS JV is shared equally between the Company and STRS Ohio, the Company does not believe it controls STRS JV for purposes of the 1940 Act or otherwise. (1) Refer to the consolidated schedule of investments for the principal amount, industry classification and other security detail of each portfolio company. ​ On January 24, 2022, as part of a restructuring agreement between the Company and PlayMonster LLC, the Company’s first lien secured term loan and delayed draw loan investments to PlayMonster LLC, with a total cost basis of $7,045, converted into a new first lien secured term loan, preferred stock and common stock of Playmonster Group LLC. On June 24, 2022, the PlayMonster LLC first lien secured revolving loan investment was fully realized. A portion of the PlayMonster LLC first lien secured revolving loan investment restructured into the existing Playmonster Group LLC first lien secured term loan, with a total cost basis of $437. For the nine months ended September 30, 2022, the Company recovered $1,725 on an equity investment to the RCS Creditor Trust Class B Units and is reported as a non-controlled affiliate realized gain in the consolidated statements of operations. The Company previously recovered $562 on the RCS Creditor Trust Class B Units during the three months ended December 31, 2021. ​ The following table presents the schedule of investments in and advances to affiliated and controlled persons (as defined by the 1940 Act) as of and for the year ended December 31, 2021: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Dividends and ​ Beginning Fair ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Net Change in ​ Ending Fair ​ ​ ​ ​ interest ​ Value at ​ ​ ​ ​ ​ ​ ​ Net ​ Unrealized ​ Value at ​ ​ Type of ​ included in ​ December 31, ​ ​ ​ ​ ​ ​ ​ Realized ​ Appreciation ​ December 31, Affiliated Person (1) Asset income 2020 Purchases Sales Gain (Loss) (Depreciation) 2021 Non-controlled affiliates ​ ​ ​ ​ ​ ​ ​ ​ Arcole Holding Corporation ​ Equity ​ $ 897 ​ $ 6,448 ​ $ — ​ $ — ​ $ — ​ $ 426 ​ $ 6,874 NMFC Senior Loan Program I LLC Units ​ Equity ​ 293 ​ 9,269 ​ — ​ (10,000) ​ — ​ 761 ​ — Total Non-controlled affiliates ​ ​ ​ $ 1,190 ​ $ 15,717 ​ $ — ​ $ (10,000) ​ $ — ​ $ 1,187 ​ $ 6,874 Controlled affiliates ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ WHF STRS Ohio Senior Loan Fund LLC* Subordinated Note ​ $ 3,307 ​ $ 41,073 ​ $ 18,927 ​ $ — ​ $ — ​ $ — ​ $ 60,000 WHF STRS Ohio Senior Loan Fund LLC* Equity ​ 4,907 ​ 10,167 ​ 4,732 ​ — ​ — ​ 708 ​ 15,607 Total Controlled affiliates ​ $ 8,214 ​ $ 51,240 ​ $ 23,659 ​ $ — ​ $ — ​ $ 708 ​ $ 75,607 * The Company and STRS Ohio are the members of STRS JV, a joint venture formed as a Delaware LLC that is not consolidated by either member for financial reporting purposes. The members make investments in STRS JV in the form of LLC equity interests and interest-bearing subordinated notes as STRS JV makes investments, and all portfolio and other material decisions regarding STRS JV must be submitted to STRS JV’s board of managers which is comprised of an equal number of members appointed by each of the Company and STRS Ohio. Because management of STRS JV is shared equally between the Company and STRS Ohio, the Company does not believe it controls STRS JV for purposes of the 1940 Act or otherwise. (1) Refer to the consolidated schedule of investments for the principal amount, industry classification and other security detail of each portfolio company. ​ WHF STRS Ohio Senior Loan Fund LLC On January 14, 2019, the Company entered into an LLC operating agreement with STRS Ohio to co-manage a newly formed joint venture investment company, STRS JV, a Delaware LLC. STRS Ohio and the Company committed to provide up to $125,000 of subordinated notes and equity to STRS JV, with STRS Ohio providing up to $50,000 and the Company providing up to $75,000, respectively. In July 2019, STRS JV formally launched operations. STRS JV invests primarily in lower middle market, senior secured debt facilities, to performing lower middle market companies across a broad range of industries that typically carry a floating interest index rate such as LIBOR or SOFR and have a term of three In February 2022, the Company increased its capital commitment to the STRS JV in the amount of an additional $25,000, which brings the Company’s total capital commitment to $100,000, comprised of $80,000 of subordinated notes and $20,000 of LLC equity interests. In connection with this increase in the Company’s capital commitment, the Company and STRS Ohio’s amended economic ownership in the STRS JV is approximately 66.67% and 33.33% , respectively. As of September 30, 2022 and December 31, 2021, STRS JV had total assets of $306,392 and $273,523, respectively. STRS JV’s portfolio consisted of debt investments in 28 portfolio companies as of September 30, 2022 and December 31, 2021. As of September 30, 2022 and December 31, 2021, the largest investment by aggregate principal amount (including any unfunded commitments) in a single portfolio company in STRS JV’s portfolio was $20,086 and $23,483, respectively. The five largest investments in portfolio companies by fair value in STRS JV totaled $77,439 and $83,057 as of September 30, 2022 and December 31, 2021, respectively. STRS JV invests in portfolio companies in the same industries in which the Company may directly invest. The Company provides capital to STRS JV in the form of LLC equity interests and through interest-bearing subordinated notes. As of September 30, 2022, the Company and STRS Ohio owned 66.67% and 33.33%, respectively, of the LLC equity interests of STRS JV. As of December 31, 2021, the Company and STRS Ohio owned 60% and 40%, respectively, of the LLC equity interests of STRS JV. The Company’s investment in STRS JV consisted of equity contributions of $20,000 and $15,000 and advances of the subordinated notes of $80,000 and $60,000 as of September 30, 2022 and December 31, 2021, respectively. As of September 30, 2022, the Company had commitments to fund equity interests and subordinated notes in STRS JV of $20,000 and $80,000, respectively, both of which were fully funded. As of December 31, 2021, the Company had commitments to fund equity interests and subordinated notes in STRS JV of $15,000 and $60,000, respectively, both of which were fully funded. The Company and STRS Ohio each appoint two members to STRS JV’s four-person board of managers. All material decisions with respect to STRS JV, including those involving its investment portfolio, require unanimous approval of a quorum of the board of managers. Quorum is defined as (i) the presence of two members of the board of managers; provided that at least one individual is present that was elected, designated or appointed by each member; (ii) the presence of three members of the board of managers; provided that the individual that was elected, designated or appointed by the member with only one individual present shall be entitled to cast two votes on each matter; or (iii) the presence of four members of the board of managers; provided that two individuals are present that were elected, designated or appointed by each member. On July 19, 2019, STRS JV entered into a $125,000 credit and security agreement (the “STRS JV Credit Facility”) with JPMorgan Chase Bank, National Association (“JPMorgan”). On January 27, 2021, the terms of the STRS JV Credit Facility were amended to, among other things, increase the size of the STRS JV Credit Facility from $125,000 to $175,000. On April 28, 2021, the terms of the STRS JV Credit Facility were amended and restated to, among other things, enable borrowings in British pounds or euros. On July 15, 2021, the terms of the STRS JV Credit Facility were amended to, among other things, allow STRS JV to reduce the applicable margins for interest rates to 2.35%, extend the non-call period from January 19, 2022 to January 19, 2023, extend the end of the reinvestment period from July 19, 2022 to July 19, 2023 and extend the scheduled termination date from July 19, 2024 to July 19, 2025. ​ On March 11, 2022, the terms of the STRS JV Credit Facility were further amended to, among other things, (i) permanently increase STRS Credit’s availability under the Credit Facility from $175,000 to $225,000 , (ii) increase the minimum funding amount from $131,250 to $168,750 , and (iii) apply an annual interest rate equal to the applicable As of September 30, 2022, the STRS JV Credit Facility had $225,000 of commitments subject to leverage and borrowing base restrictions with an interest rate based on a floating index rate such as LIBOR, SONIA or CDOR plus 2.35% for borrowings up to $175,000 and SOFR plus 2.50% for USD borrowings above $175,000. The final maturity date of the STRS JV Credit Facility is July 19, 2025. As of September 30, 2022, STRS JV had $151,127 of outstanding borrowings and a weighted average effective interest rate of 3.3% per annum under the STRS JV Credit Facility. As of September 30, 2022, the interest rate outstanding under the STRS JV Credit Facility was 5.1%. As of December 31, 2021, the STRS JV Credit Facility had $175,000 of commitments subject to leverage and borrowing base restrictions with an interest rate based on a floating index rate such as LIBOR, SONIA or CDOR plus 2.35%. As of December 31, 2021, STRS JV had $146,782 of outstanding borrowings and an effective interest rate of 2.5% per annum under the STRS JV Credit Facility. Below is a listing of STRS JV’s individual investments as of September 30, 2022: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Issuer Investment Type (1) Floor Spread Above Index (2) Interest Rate (3) Acquisition Date (4) Maturity Date Principal/ Share Amount Amortized Cost Fair Value (5) North America ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Debt Investments ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Advertising ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ I&I Sales Group, LLC (d/b/a Avision Sales Group) ​ First Lien Secured Term Loan ​ 1.00% ​ L+ 5.75% ​ 9.42% ​ 02/18/22 ​ 12/15/26 ​ 9,216 ​ $ 9,061 ​ $ 9,074 I&I Sales Group, LLC (d/b/a Avision Sales Group) (6) ​ First Lien Secured Delayed Draw Loan ​ 1.00% ​ L+ 5.75% ​ 9.00% ​ 03/11/22 ​ 12/15/26 ​ 714 ​ ​ 702 ​ ​ 707 I&I Sales Group, LLC (d/b/a Avision Sales Group) ​ First Lien Secured Revolving Loan ​ 1.00% ​ L+ 5.75% ​ 9.42% ​ 02/18/22 ​ 12/15/26 ​ — ​ ​ — ​ ​ 1 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 9,763 ​ ​ 9,782 Air Freight & Logistics ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ITS Buyer Inc. ​ First Lien Secured Term Loan ​ 1.00% ​ L+ 6.00% ​ 9.67% ​ 02/17/22 ​ 06/15/26 ​ 3,589 ​ ​ 3,531 ​ ​ 3,553 ITS Buyer Inc. ​ First Lien Secured Revolving Loan ​ 1.00% ​ L+ 6.00% ​ 9.67% ​ 02/17/22 ​ 06/15/26 ​ — ​ ​ — ​ ​ 4 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 3,531 ​ ​ 3,557 Application Software ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ MEP-TS Midco, LLC (d/b/a Tax Slayer) ​ First Lien Secured Term Loan ​ 1.00% ​ L+ 6.00% ​ 8.88% ​ 01/21/21 ​ 12/31/26 ​ 13,387 ​ ​ 13,183 ​ ​ 13,387 MEP-TS Midco, LLC (d/b/a Tax Slayer) ​ First Lien Secured Revolving Loan ​ 1.00% ​ L+ 6.00% ​ 8.88% ​ 01/21/21 ​ 12/31/26 ​ — ​ ​ — ​ ​ 24 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 13,183 ​ ​ 13,411 Building Products ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Drew Foam Companies Inc ​ First Lien Secured Term Loan ​ 1.00% ​ L+ 6.00% ​ 9.67% ​ 11/09/20 ​ 11/05/25 ​ 14,305 ​ ​ 14,125 ​ ​ 14,305 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 14,125 ​ ​ 14,305 Construction & Engineering ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Road Safety Services, Inc. ​ First Lien Secured Term Loan ​ 1.00% ​ SF+ 6.50% ​ 9.63% ​ 12/31/19 ​ 03/18/25 ​ 8,625 ​ ​ 8,534 ​ ​ 8,625 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 8,534 ​ ​ 8,625 Data Processing & Outsourced Services ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Geo Logic Systems Ltd. (7) ​ First Lien Secured Term Loan ​ 1.00% ​ C+ 6.50% ​ 10.67% ​ 01/22/20 ​ 12/19/24 ​ 20,225 ​ ​ 15,497 ​ ​ 14,505 Geo Logic Systems Ltd. (7) ​ First Lien Secured Revolving Loan ​ 1.00% ​ C+ 6.50% ​ 10.67% ​ 01/22/20 ​ 12/19/24 ​ — ​ ​ — ​ ​ 2 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 15,497 ​ ​ 14,507 Diversified Support Services ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Quest Events, LLC ​ First Lien Secured Term Loan ​ 1.00% ​ L+ 6.00% ​ 9.67% ​ 07/19/19 ​ 12/28/24 ​ 11,926 ​ ​ 11,838 ​ ​ 11,317 Quest Events, LLC ​ First Lien Secured Revolving Loan ​ 1.00% ​ L+ 6.00% ​ 9.67% ​ 07/19/19 ​ 12/28/24 ​ 468 ​ ​ 464 ​ ​ 424 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 12,302 ​ ​ 11,741 Electronic Equipment & Instruments ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ LMG Holdings, Inc. ​ First Lien Secured Term Loan ​ 1.00% ​ L+ 7.00% ​ 10.67% ​ 06/28/21 ​ 04/30/26 ​ 13,501 ​ ​ 13,303 ​ ​ 13,229 LMG Holdings, Inc. ​ First Lien Secured Revolving Loan ​ 1.00% ​ L+ 7.00% ​ 10.09% ​ 06/28/21 ​ 04/30/26 ​ 265 ​ ​ 261 ​ ​ 256 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 13,564 ​ ​ 13,485 Environmental & Facilities Services ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Juniper Landscaping Holdings LLC ​ First Lien Secured Term Loan ​ 1.00% ​ L+ 6.00% ​ 9.67% ​ 03/01/22 ​ 12/29/26 ​ 11,334 ​ ​ 11,165 ​ ​ 11,151 Juniper Landscaping Holdings LLC (6) ​ First Lien Secured Delayed Draw Loan ​ 1.00% ​ L+ 6.00% ​ 9.67% ​ 03/01/22 ​ 12/29/26 ​ — ​ ​ — ​ ​ (3) Juniper Landscaping Holdings LLC ​ First Lien Secured Revolving Loan ​ 1.00% ​ L+ 6.00% ​ 9.67% ​ 03/01/22 ​ 12/29/26 ​ — ​ ​ — ​ ​ (1) WH Lessor Corp. (d/b/a Waste Harmonics, LLC) ​ First Lien Secured Term Loan ​ 1.00% ​ L+ 5.59% ​ 8.70% ​ 01/22/20 ​ 12/26/24 ​ 7,490 ​ ​ 7,412 ​ ​ 7,489 WH Lessor Corp. (d/b/a Waste Harmonics, LLC) ​ First Lien Secured Revolving Loan ​ 1.00% ​ L+ 5.59% ​ 8.70% ​ 01/22/20 ​ 12/26/24 ​ — ​ ​ — ​ ​ 5 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 18,577 ​ ​ 18,641 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Issuer Investment Type (1) Floor Spread Above Index (2) Interest Rate (3) Acquisition Date (4) Maturity Date Principal/ Share Amount Amortized Cost Fair Value (5) Household Appliances ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Smalto Inc. (d/b/a PEMCO International) (9) ​ First Lien Secured Term Loan ​ 1.00% ​ E + 6.25% ​ 7.25% ​ 05/04/22 ​ 04/28/28 ​ 6,659 ​ $ 6,876 ​ $ 6,364 Smalto Inc. (d/b/a PEMCO International) ​ First Lien Secured Term Loan ​ 1.00% ​ SF+ 6.00% ​ 9.19% ​ 05/04/22 ​ 04/28/28 ​ 1,014 ​ ​ 995 ​ ​ 996 Smalto Inc. (d/b/a PEMCO International) (9) ​ First Lien Secured Revolving Loan ​ 1.00% ​ E + 6.25% ​ 7.25% ​ 05/04/22 ​ 04/29/27 ​ 419 ​ ​ 437 ​ ​ 396 Smalto Inc. (d/b/a PEMCO International) ​ First Lien Secured Revolving Loan ​ 1.00% ​ SF+ 6.00% ​ 8.68% ​ 05/04/22 ​ 04/29/27 ​ 17 ​ ​ 17 ​ ​ 17 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 8,325 ​ ​ 7,773 Industrial Machinery ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ BLP Buyer, Inc. (d/b/a Bishop Lifting Products, Inc.) ​ First Lien Secured Term Loan ​ 1.00% ​ L+ 6.25% ​ 9.03% ​ 02/18/22 ​ 02/01/27 ​ 8,209 ​ ​ 8,066 ​ ​ 8,080 BLP Buyer, Inc. (d/b/a Bishop Lifting Products, Inc.) ​ First Lien Secured Revolving Loan ​ 1.00% ​ L+ 6.25% ​ 9.00% ​ 02/18/22 ​ 02/01/27 ​ 274 ​ ​ 269 ​ ​ 271 Pennsylvania Machine Works, LLC (d/b/a Penn Western) ​ First Lien Secured Term Loan ​ 1.00% ​ SF+ 6.25% ​ 10.06% ​ 03/25/22 ​ 03/08/27 ​ 6,925 ​ ​ 6,833 ​ ​ 6,925 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 15,168 ​ ​ 15,276 Internet & Direct Marketing Retail ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Marlin DTC-LS Midco 2, LLC (d/b/a Clarus Commerce, LLC) ​ First Lien Secured Term Loan ​ 1.00% ​ L+ 6.50% ​ 9.57% ​ 07/19/19 ​ 07/01/25 ​ 19,105 ​ ​ 18,901 ​ ​ 19,105 Marlin DTC-LS Midco 2, LLC (d/b/a Clarus Commerce, LLC) ​ First Lien Secured Revolving Loan ​ 1.00% ​ L+ 6.50% ​ 9.57% ​ 07/19/19 ​ 07/01/25 ​ — ​ ​ — ​ ​ 9 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 18,901 ​ ​ 19,114 Investment Banking & Brokerage ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ TOUR Intermediate Holdings, LLC ​ First Lien Secured Term Loan ​ 1.00% ​ L+ 6.50% ​ 9.62% ​ 05/19/20 ​ 05/15/25 ​ 3,182 ​ ​ 3,150 ​ ​ 3,182 TOUR Intermediate Holdings, LLC ​ First Lien Secured Delayed Draw Loan ​ 1.00% ​ L+ 6.50% ​ 9.62% ​ 05/19/20 ​ 05/15/25 ​ 2,505 ​ ​ 2,493 ​ ​ 2,505 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 5,643 ​ ​ 5,687 IT Consulting & Other Services ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Cennox Holdings Limited (d/b/a Cennox) (8) ​ First lien Secured Term Loan ​ 1.00% ​ L+ 6.00% ​ 7.69% ​ 07/16/21 ​ 05/04/26 ​ 2,844 ​ ​ 3,868 ​ ​ 3,140 Cennox Holdings Limited (d/b/a Cennox) (9) ​ First lien Secured Term Loan ​ 1.00% ​ L+ 6.25% ​ 9.78% ​ 06/28/22 ​ 05/04/26 ​ 9,482 ​ ​ 9,845 ​ ​ 9,205 Cennox Holdings Limited (d/b/a Cennox) (8) ​ First lien Secured Revolving Loan ​ 1.00% ​ L+ 6.00% ​ 8.03% ​ 07/16/21 ​ 05/04/26 ​ 450 ​ ​ 680 ​ ​ 502 RCKC Acquisitions LLC (d/b/a KSM Consulting, LLC) ​ First Lien Secured Term Loan ​ 1.00% ​ L+ 6.25% ​ 9.92% ​ 01/27/21 ​ 12/31/26 ​ 11,179 ​ ​ 11,018 ​ ​ 11,011 RCKC Acquisitions LLC (d/b/a KSM Consulting, LLC) ​ First Lien Secured Delayed Draw Loan ​ 1.00% ​ L+ 6.25% ​ 9.04% ​ 01/27/21 ​ 12/31/26 ​ 3,014 ​ ​ 2,967 ​ ​ 2,969 RCKC Acquisitions LLC (d/b/a KSM Consulting, LLC) (6) ​ First Lien Secured Revolving Loan ​ 1.00% ​ L+ 6.25% ​ 9.20% ​ 01/27/21 ​ 12/31/26 ​ 533 ​ ​ 526 ​ ​ 525 Turnberry Solutions, Inc. ​ First Lien Secured Term Loan ​ 1.00% ​ SF+ 6.00% ​ 9.19% ​ 08/10/21 ​ 09/02/26 ​ 6,103 ​ ​ 6,008 ​ ​ 5,973 Turnberry Solutions, Inc. ​ First Lien Secured Revolving Loan ​ 1.00% ​ P+ 5.00% ​ 11.25% ​ 08/10/21 ​ 09/02/26 ​ 22 ​ ​ 21 ​ ​ 17 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 34,933 ​ ​ 33,342 Leisure Products ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Unleashed Brands, LLC (d/b/a Unleashed Brands Group) ​ First Lien Secured Term Loan ​ 1.00% ​ L+ 5.50% ​ 8.62% ​ 11/30/21 ​ 11/19/26 ​ 3,887 ​ ​ 3,854 ​ ​ 3,887 Unleashed Brands, LLC (d/b/a Unleashed Brands Group) (6) ​ First Lien Secured Delayed Draw Loan ​ 1.00% ​ L+ 5.50% ​ 8.62% ​ 11/30/21 ​ 11/19/26 ​ 5,133 ​ ​ 5,091 ​ ​ 5,151 Unleashed Brands, LLC (d/b/a Unleashed Brands Group) ​ First Lien Secured Revolving Loan ​ 1.00% ​ L+ 5.50% ​ 8.62% ​ 11/30/21 ​ 11/19/26 ​ — ​ ​ — ​ ​ 6 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 8,945 ​ ​ 9,044 Packaged Foods & Meats ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Poultry Holdings LLC (HPP) ​ First Lien Secured Term Loan ​ 1.00% ​ SF+ 7.25% ​ 10.38% (8.88% Cash + 1.50% PIK) ​ 10/21/19 ​ 06/28/25 ​ 7,183 ​ ​ 7,117 ​ ​ 6,914 Stella & Chewy's LLC ​ First Lien Secured Term Loan ​ 1.00% ​ SF+ 8.75% ​ 12.24% (10.24% Cash + 2.00% PIK) ​ 12/29/20 ​ 12/16/25 ​ 3,874 ​ ​ 3,826 ​ ​ 3,758 Stella & Chewy's LLC ​ First Lien Secured Delayed Draw Loan ​ 1.00% ​ SF+ 8.75% ​ 11.92% (9.92% Cash + 2.00% PIK) ​ 03/26/21 ​ 12/16/25 ​ 1,367 ​ ​ 1,354 ​ ​ 1,326 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 12,297 ​ ​ 11,998 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Issuer Investment Type (1) Floor Spread Above Index (2) Interest Rate (3) Acquisition Date (4) Maturity Date Principal/ Share Amount Amortized Cost Fair Value (5) Personal Products ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Sunless, Inc. ​ First Lien Secured Term Loan ​ 1.00% ​ L+ 6.50% ​ 10.17% ​ 10/21/19 ​ 08/13/25 ​ 3,691 ​ $ 3,639 ​ $ 3,691 Sunless, Inc. (6) ​ First Lien Secured Revolving Loan ​ 1.00% ​ L+ 6.50% ​ 10.17% ​ 10/21/19 ​ 08/13/25 ​ — ​ ​ — ​ ​ 7 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 3,639 ​ ​ 3,698 Pharmaceuticals ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Meta Buyer LLC (d/b/a Metagenics, Inc.) (9) ​ First Lien Secured Term Loan ​ 1.00% ​ E + 6.00% ​ 7.00% ​ 12/16/21 ​ 11/01/27 ​ 12,318 ​ ​ 13,664 ​ ​ 11,844 Meta Buyer LLC (d/b/a Metagenics, Inc.) ​ First Lien Secured Term Loan ​ 1.00% ​ L+ 6.00% ​ 8.80% ​ 12/16/21 ​ 11/01/27 ​ 984 ​ ​ 967 ​ ​ 971 Meta Buyer LLC (d/b/a Metagenics, Inc.) ​ First Lien Secured Delayed Draw Loan ​ 1.00% ​ L+ 6.00% ​ 9.52% ​ 12/16/21 ​ 11/01/27 ​ 897 ​ ​ 881 ​ ​ 885 Meta Buyer LLC (d/b/a Metagenics, Inc.) ​ First Lien Secured Revolving Loan ​ 1.00% ​ L+ 6.00% ​ 8.80% ​ 12/16/21 ​ 11/01/27 ​ — ​ ​ — ​ ​ 6 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 15,512 ​ ​ 13,706 Real Estate Operating Companies ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ HRG Management, LLC (d/b/a HomeRiver Group, LLC) ​ First Lien Secured Term Loan ​ 1.00% ​ L+ 6.25% ​ 8.99% ​ 12/28/21 ​ 10/19/26 ​ 9,677 ​ ​ 9,520 ​ ​ 9,484 HRG Management, LLC (d/b/a HomeRiver Group, LLC) (6) ​ First Lien Secured Delayed Draw Loan ​ 1.00% ​ L+ 6.25% ​ 8.99% ​ 02/18/22 ​ 10/19/26 ​ 1,273 ​ ​ 1,257 ​ ​ 1,242 HRG Management, LLC (d/b/a HomeRiver Group, LLC) ​ First Lien Secured Revolving Loan ​ 1.00% ​ L+ 6.25% ​ 8.99% ​ 02/18/22 ​ 10/19/26 ​ — ​ ​ — ​ ​ (4) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 10,777 ​ ​ 10,722 Real Estate Services ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ NPAV Lessor Corp. (d/b/a Nationwide Property & Appraisal Services, LLC) ​ First Lien Secured Term Loan ​ 1.00% ​ SF+ 6.00% ​ 9.16% ​ 03/01/22 ​ 01/21/27 ​ 8,946 ​ ​ 8,791 ​ ​ 8,588 NPAV Lessor Corp. (d/b/a Nationwide Property & Appraisal Services, LLC) ​ First Lien Secured Revolving Loan ​ 1.00% ​ SF+ 6.00% ​ 9.16% ​ 03/01/22 ​ 01/21/27 ​ — ​ ​ — ​ ​ (16) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 8,791 ​ ​ 8,572 Research & Consulting Services ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ E-Phoenix Acquisition Co. Inc. (d/b/a Integreon, Inc.) ​ First Lien Secured Term Loan ​ 1.00% ​ L+ 5.75% ​ 9.42% ​ 07/15/21 ​ 06/23/27 ​ 8,888 ​ ​ 8,799 ​ ​ 8,832 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 8,799 ​ ​ 8,832 Technology Hardware, Storage & Peripherals ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Source Code Holdings, LLC (d/b/a Source Code Corporation) ​ First Lien Secured Term Loan ​ 1.00% ​ SF+ 6.50% ​ 9.63% ​ 08/10/21 ​ 07/30/27 ​ 15,143 ​ ​ 14,899 ​ ​ 14,970 Source Code Holdings, LLC (d/b/a Source Code Corporation) (6) ​ First Lien Secured Delayed Draw Loan ​ 1.00% ​ SF+ 6.50% ​ 9.63% ​ 08/10/21 ​ 07/30/27 ​ — ​ ​ — ​ ​ 21 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 14,899 ​ ​ 14,991 Trading Companies & Distributors ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ LINC Systems, LLC ​ First Lien Secured Term Loan ​ 1.00% ​ L+ 6.25% ​ 10.33% ​ 06/22/21 ​ 02/24/26 ​ 10,058 ​ ​ 9,909 ​ ​ 10,058 LINC Systems, LLC ​ First Lien Secured Revolving Loan ​ 1.00% ​ L+ 6.25% ​ 10.33% ​ 06/22/21 ​ 02/24/26 ​ — ​ ​ — ​ ​ 10 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 9,909 ​ ​ 10,068 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total Investments ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ $ 285,614 ​ $ 280,877 ​ Forward Currency Contracts ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Counterparty Currency to be sold ​ Currency to be purchased ​ Settlement date Unrealized appreciation Unrealized depreciation Morgan Stanley ​ C$ 348 CAD ​ $ 270 USD ​ 10/28/22 ​ $ 18 ​ $ — Morgan Stanley ​ £ 282 GBP ​ $ 340 USD ​ 10/28/22 ​ ​ 25 ​ ​ — Morgan Stanley ​ € 1,383 EUR ​ $ 1,394 USD ​ 10/28/22 ​ ​ 36 ​ ​ — Total ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ $ 79 ​ $ — ​ (1) Except as noted, all investments provide collateral for the STRS JV Credit Facility. (2) The investments bear interest at a rate that may be determined by reference to LIBOR, which resets monthly, quarterly or semiannually, SOFR, CDOR, Prime, Euro Interbank Offered Rate (“EurIBOR” or “E”). (3) The interest rate is the “all-in-rate” including the current index and spread, the fixed rate, and the PIK interest rate, as the case may be. (4) Except as otherwise noted, all of STRS JV’s portfolio company investments, which as of the date of the portfolio represented 849% of STRS JV’s members’ equity or 92% of STRS JV’s total assets, are subject to legal restrictions on sales. (5) The fair value of each investment was determined using significant unobservable inputs. (6) The investment or a portion of the investment does not provide collateral for the STRS JV Credit Facility. (7) Principal amount is denominated in Canadian dollars and the issuer is domiciled in Canada. (8) Principal amount is denominated in British Pounds and the issuer is domiciled in the United Kingdom. (9) Principal amount is denominated in Euros. Below is a listing of STRS JV’s individual investments as of December 31, 2021: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Issuer Investment Type (1) Floor Spread Above Index (2) ​ Interest Rate (3) Acquisition Date (4) Maturity Date Principal/ Share Amount Amortized Cost Fair Value (5) North America ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Debt Investments ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Application Software ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ MEP-TS Midco, LLC (d/b/a Tax Slayer) ​ First Lien Secured Term Loan ​ 1.00% ​ L+ 6.00% ​ 7.00% ​ 01/21/21 ​ 12/31/26 ​ 13,490 ​ $ 13,247 ​ $ 13,490 MEP-TS Midco, LLC (d/b/a Tax Slayer) ​ First Lien Secured Revolving Loan ​ 1.00% ​ L+ 6.00% ​ 7.00% ​ 01/21/21 ​ 12/31/26 ​ — ​ ​ — ​ ​ 28 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 13,247 ​ ​ 13,518 Building Products ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Drew Foam Companies Inc ​ First Lien Secured Term Loan ​ 1.00% ​ L+ 6.00% ​ 7.00% ​ 11/09/20 ​ 11/05/25 ​ 7,207 ​ ​ 7,096 ​ ​ 7,183 LHS Borrower, LLC (d/b/a Leaf Home, LLC) ​ First Lien Secured Term Loan ​ 1.00% ​ L+ 6.75% ​ 7.75% ​ 10/09/20 ​ 09/30/25 ​ 9,506 ​ ​ 9,345 ​ ​ 9,416 LHS Borrower, LLC (d/b/a Leaf Home, LLC) ​ First Lien Secured Revolving Loan ​ 1.00% ​ L+ 6.75% ​ 7.75% ​ 10/09/20 ​ 09/30/25 ​ — ​ ​ — ​ ​ 4 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 16,441 ​ ​ 16,603 Construction & Engineering ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Road Safety Services, Inc. ​ First Lien Secured Term Loan ​ 1.00% ​ L+ 6.50% ​ 7.50% ​ 12/31/19 ​ 03/18/25 ​ 6,427 ​ ​ 6,340 ​ ​ 6,405 Road Safety Services, Inc. ​ First Lien Secured Revolving Loan ​ 3.25% ​ P+ 5.50% ​ 8.75% ​ 12/31/19 ​ 09/18/23 ​ 496 ​ ​ 489 ​ ​ 501 Tensar Corporation ​ First Lien Secured Term Loan ​ 1.00% ​ L+ 6.75% ​ 7.75% ​ 11/24/20 ​ 08/20/25 ​ 6,930 ​ ​ 6,797 ​ ​ 7,069 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 13,626 ​ ​ 13,975 Data Processing & Outsourced Services ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Geo Logic Systems Ltd. (7) ​ First Lien Secured Term Loan ​ 1.00% ​ C+ 6.50% ​ 7.50% ​ 01/22/20 ​ 12/19/24 ​ 20,632 ​ ​ 15,766 ​ ​ 16,156 Geo Logic Systems Ltd. (7) ​ First Lien

FAIR VALUE MEASUREMENTS

FAIR VALUE MEASUREMENTS	9 Months Ended
	Sep. 30, 2022
FAIR VALUE MEASUREMENTS
FAIR VALUE MEASUREMENTS	NOTE 5 – FAIR VALUE MEASUREMENTS Accounting standards establish a fair value hierarchy which requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. The standard describes three levels of inputs that may be used to measure fair value: Level 1: Level 2: Level 3: In certain cases, the inputs used to measure fair value may fall into different levels of the fair value hierarchy. In such cases, a financial instrument’s categorization within the fair value hierarchy is based on the lowest level of input that is significant to the fair value measurement. The Company’s assessment of the significance of a particular input to the fair value measurement in its entirety requires judgment, and considers factors specific to the financial instrument. A review of the fair value hierarchy classifications is conducted on a quarterly basis. Changes in the observability of valuation inputs may result in a reclassification for certain financial assets or liabilities. Reclassifications impacting Level 3 of the fair value hierarchy are reported as transfers in or out of the Level 3 category as of the beginning of the quarter in which the reclassifications occur. During the nine months ended September 30, 2022 and year ended December 31, 2021, there were no changes in the observability of valuation inputs that would have resulted in a reclassification of assets between any levels. Fair value for each investment is derived using a combination of valuation methodologies that, in the judgment of the Investment Committee are most relevant to such investment, including, without limitation, being based on one or more of the following: (i) market prices obtained from market makers for which the Investment Committee has deemed there to be enough breadth (number of quotes) and depth (firm bids) to be indicative of fair value, (ii) the price paid or realized in a completed transaction or binding offer received in an arm’s-length transaction, (iii) a discounted cash flow analysis, (iv) the guideline public company method, (v) the similar transaction method or (vi) the option pricing method. ​ The following table presents investments (as shown on the consolidated schedule of investments) that were measured at fair value as of September 30, 2022: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Level 1 Level 2 Level 3 Total First lien secured loans ​ $ — ​ $ — ​ $ 615,945 ​ $ 615,945 Second lien secured loans ​ — ​ — ​ 20,383 ​ 20,383 Subordinated unsecured loans ​ ​ — ​ — ​ 167 ​ 167 Subordinated Note to STRS JV ​ — ​ — ​ 80,000 ​ 80,000 Equity (excluding STRS JV) ​ — ​ — ​ 25,993 ​ 25,993 Equity in STRS JV (1) ​ — ​ — ​ — ​ 22,066 Total investments ​ $ — ​ $ — ​ $ 742,488 ​ $ 764,554 (1) The Company’s equity investment in STRS JV is measured using the net asset value per share as a practical expedient for fair value, and thus has not been classified in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the consolidated statements of assets and liabilities. The Company’s forward currency contracts, which were valued at $10 as of September 30, 2022, are characterized in Level 2 of the hierarchy. The following table presents investments (as shown on the consolidated schedule of investments) that were measured at fair value as of December 31, 2021: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Level 1 Level 2 Level 3 ​ Total First lien secured loans ​ $ — ​ $ — ​ $ 697,232 ​ $ 697,232 Second lien secured loans ​ — ​ — ​ 23,650 ​ 23,650 Subordinated Note to STRS JV ​ ​ — ​ — ​ 167 ​ 167 Subordinated Note to STRS JV ​ — ​ — ​ 60,000 ​ ​ 60,000 Equity (excluding STRS JV) ​ — ​ — ​ 22,552 ​ 22,552 Equity in STRS JV (1) ​ — ​ — ​ — ​ 15,607 Total investments ​ $ — ​ $ — ​ $ 803,601 ​ $ 819,208 (1) The Company’s equity investment in STRS JV is measured using the net asset value per share as a practical expedient for fair value, and thus has not been classified in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the consolidated statements of assets and liabilities. ​ The following table presents the changes in investments measured at fair value using Level 3 inputs for the three and nine months ended September 30, 2022: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ First Lien Second Lien ​ Subordinated ​ ​ ​ ​ ​ ​ Secured ​ Secured ​ Subordinated ​ Notes to STRS ​ ​ ​ ​ Total Three months ended September 30, 2022 ​ Loans ​ Loans ​ Notes ​ JV ​ Equity ​ Investments Fair value, beginning of period ​ $ 614,859 ​ $ 22,063 $ 167 ​ $ 80,000 ​ $ 27,111 ​ $ 744,200 Funding of investments ​ 52,893 ​ — ​ — ​ — ​ 408 ​ 53,301 Non-cash interest income ​ 594 ​ 3 ​ — ​ — ​ — ​ 597 Accretion of discount ​ 1,039 ​ 21 ​ — ​ — ​ — ​ 1,060 Proceeds from paydowns and sales ​ (48,549) ​ — ​ — ​ — ​ (1,011) ​ (49,560) Conversions ​ — ​ — ​ — ​ — ​ — ​ — Realized gains (losses) ​ 45 ​ — ​ — ​ — ​ 154 ​ 199 Net unrealized (depreciation) appreciation ​ (4,936) ​ (1,704) ​ — ​ — ​ (669) ​ (7,309) Fair value, end of period ​ $ 615,945 ​ $ 20,383 $ 167 ​ $ 80,000 ​ $ 25,993 ​ $ 742,488 Change in unrealized appreciation (depreciation) on investments still held as of September 30, 2022 ​ $ (4,689) ​ $ (1,702) ​ $ — ​ $ — ​ $ (384) ​ $ (6,775) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ First Lien Second Lien ​ Subordinated ​ ​ ​ ​ ​ ​ Secured ​ Secured ​ Subordinated ​ Notes to STRS ​ ​ ​ ​ Total Nine months ended September 30, 2022 ​ Loans ​ Loans ​ Notes ​ JV ​ Equity ​ Investments Fair value, beginning of period ​ $ 697,232 ​ $ 23,650 $ 167 ​ $ 60,000 ​ $ 22,552 ​ $ 803,601 Funding of investments ​ 222,667 ​ — ​ — ​ 20,000 ​ 1,085 ​ 243,752 Non-cash interest income ​ 1,548 ​ 5 ​ — ​ — ​ — ​ 1,553 Accretion of discount (premium) ​ 3,972 ​ 64 ​ — ​ — ​ — ​ 4,036 Proceeds from paydowns and sales ​ (293,935) ​ — ​ — ​ — ​ (2,862) ​ (296,797) Conversions ​ (4,060) ​ — ​ — ​ — ​ 4,060 ​ — Realized gains (losses) ​ (16,994) ​ (1,024) ​ — ​ — ​ 1,919 ​ (16,099) Net unrealized (depreciation) appreciation ​ 5,515 ​ (2,312) ​ — ​ — ​ (761) ​ 2,442 Fair value, end of period ​ $ 615,945 ​ $ 20,383 $ 167 ​ $ 80,000 ​ $ 25,993 ​ $ 742,488 Change in unrealized appreciation (depreciation) on investments still held as of September 30, 2022 ​ $ (6,691) ​ $ (3,336) ​ $ — ​ $ — ​ $ (600) ​ $ (10,627) ​ ​ The following table presents the changes in investments measured at fair value using Level 3 inputs for the three and nine months ended September 30, 2021: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ First Lien Second Lien ​ ​ Subordinated ​ ​ ​ ​ ​ ​ Secured ​ Secured ​ Subordinated ​ Notes to STRS ​ ​ ​ ​ Total Three months ended September 30, 2021 ​ Loans ​ Loans ​ Notes ​ JV ​ Equity ​ Investments Fair value, beginning of period ​ $ 562,837 ​ $ 29,714 $ — ​ $ 49,809 ​ $ 16,033 ​ $ 658,393 Funding of investments ​ 135,497 ​ — ​ 167 ​ 7,488 ​ 2,278 ​ 145,430 Non-cash interest income ​ 173 ​ 1 ​ — ​ — ​ — ​ 174 Accretion of discount ​ 2,115 ​ 29 ​ — ​ — ​ — ​ 2,144 Proceeds from paydowns and sales ​ (133,361) ​ — ​ — ​ — ​ — ​ (133,361) Realized gains ​ 120 ​ — ​ — ​ — ​ (11) ​ 109 Net unrealized (depreciation) appreciation ​ (2,385) ​ (82) ​ — ​ — ​ 1,888 ​ (579) Fair value, end of period ​ $ 564,996 ​ $ 29,662 ​ $ 167 ​ $ 57,297 ​ $ 20,188 ​ $ 672,310 Change in unrealized appreciation (depreciation) on investments still held as of September 30, 2021 ​ $ 216 ​ $ 112 ​ $ — ​ $ — ​ $ 2,931 ​ $ 3,259 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ First Lien Second Lien ​ ​ Subordinated ​ ​ ​ ​ ​ ​ Secured ​ Secured ​ Subordinated ​ Notes to STRS ​ ​ ​ ​ Total Nine months ended September 30, 2021 ​ Loans ​ Loans ​ Notes ​ JV ​ Equity ​ Investments Fair value, beginning of period ​ $ 588,580 ​ $ 27,596 $ — ​ $ 41,073 ​ $ 23,319 ​ $ 680,568 Funding of investments ​ 310,749 ​ 14,550 ​ 498 ​ 16,224 ​ 2,938 ​ 344,959 Non-cash interest income ​ 857 ​ 3 ​ — ​ — ​ — ​ 860 Accretion of discount ​ 5,549 ​ 125 ​ — ​ — ​ (25) ​ 5,649 Proceeds from paydowns and sales ​ (341,177) ​ (12,670) ​ (331) ​ — ​ (9,442) ​ (363,620) Realized losses ​ 8,288 ​ — ​ — ​ — ​ (574) ​ 7,714 Net unrealized (depreciation) appreciation ​ (7,850) ​ 58 ​ — ​ — ​ 3,972 ​ (3,820) Fair value, end of period ​ $ 564,996 ​ $ 29,662 ​ $ 167 ​ $ 57,297 ​ $ 20,188 ​ $ 672,310 Change in unrealized appreciation (depreciation) on investments still held as of September 30, 2021 ​ $ 1,516 ​ $ 113 ​ $ — ​ $ — ​ $ 3,211 ​ $ 4,840 ​ The significant unobservable inputs used in the fair value measurement of the Company’s investments are the discount rate, market quotes and exit multiples. An increase or decrease in the discount rate in isolation would result in significantly lower or higher fair value measurement, respectively. An increase or decrease in the market quote for an investment would in isolation result in significantly higher or lower fair value measurement, respectively. An increase or decrease in the exit multiple would in isolation result in significantly higher or lower fair value measurement, respectively. As the fair value of a debt investment diverges from par, which would generally be the case for non-accrual loans, the fair value measurement of that investment is more susceptible to volatility from changes in exit multiples as a significant unobservable input. ​ Quantitative information about Level 3 fair value measurements is as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Fair Value as of ​ Valuation ​ Unobservable ​ Range Investment Type ​ September 30, 2022 ​ Techniques ​ Inputs ​ (Weighted Average) (1) First lien secured loans ​ $ 406,569 ​ Discounted cash flows ​ Discount rate ​ 7.5% – 19.9% (12.4%) ​ ​ ​ 37,014 ​ Recent transaction ​ Transaction price ​ 82.0 – 99.1 (91.8) ​ ​ ​ 111,055 ​ Discounted cash flows and Recent transaction ​ Discount rate ​ 7.6% – 13.5% (12.6%) ​ ​ ​ ​ ​ ​ ​ Transaction price ​ 92.4 – 100.0 (97.9) ​ ​ ​ 30,790 ​ Discounted cash flows and Market quote ​ Discount Rate ​ 10.5% – 11.8% (11.4%) ​ ​ ​ ​ ​ ​ ​ Market Quote ​ 85.2 – 95.1 (90.7) ​ ​ ​ 30,517 ​ Expected repayment ​ Transaction price ​ 100.0 ​ ​ $ 615,945 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Second lien secured loans ​ $ 3,274 ​ Discounted cash flows ​ Discount rate ​ 17.4% ​ ​ ​ 4,912 ​ Discounted cash flows and Recent transaction ​ Transaction price ​ 98.6 ​ ​ ​ ​ ​ ​ ​ Discount rate ​ 12.2% ​ ​ ​ 12,197 ​ Discounted cash flows and Market quote ​ Discount Rate ​ 18.2% ​ ​ ​ ​ ​ ​ ​ Market Quote ​ 77.8 ​ ​ $ 20,383 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Subordinated Notes ​ $ 80,000 ​ Enterprise value ​ – ​ – ​ ​ ​ 167 ​ Discounted cash flows ​ Discount Rate ​ 4.1% ​ ​ $ 80,167 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Preferred Equity ​ $ 2,217 ​ Discounted cash flows ​ Discount rate ​ 24.3% – 25.5% (24.4%) ​ ​ ​ ​ ​ ​ ​ EBITDA Multiple ​ 9.0x ​ ​ ​ 816 ​ Discounted cash flows and Enterprise value ​ Discount Rate ​ 17.0% ​ ​ ​ ​ ​ ​ ​ EBITDA Multiple ​ 3.6x - 8.5x (6.1x) ​ ​ ​ ​ ​ ​ ​ Discount for lack of marketability ​ 15.0% ​ ​ ​ 853 ​ Enterprise value ​ Discount Rate ​ 11.7% ​ ​ $ 3,886 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Common Equity ​ $ 1,614 ​ Discounted cash flows ​ Discount rate ​ 19.3% – 21.3% (21.1%) ​ ​ ​ ​ ​ ​ ​ EBITDA Multiple ​ 7.5x ​ ​ ​ 9,523 ​ Discounted cash flows and Enterprise value ​ Discount Rate ​ 12.0% – 19.4% (18.1%) ​ ​ ​ ​ ​ ​ ​ EBITDA Multiple ​ 4.8 - 12.1 (9.3x) ​ ​ ​ 361 ​ Enterprise value ​ EBITDA Multiple ​ 13.3x - 17.1x (15.2x) ​ ​ ​ ​ ​ ​ ​ Discount for lack of marketability ​ 10.0% ​ ​ ​ 219 ​ Collateral value and Recent transaction ​ Transaction price ​ $1.30 per share ​ ​ ​ ​ ​ ​ ​ EBITDA Multiple ​ 8.0x ​ ​ ​ ​ ​ ​ ​ Discount for lack of marketability ​ 15.0% ​ ​ ​ 2,471 ​ Collateral value ​ EBITDA Multiple ​ 6.0x – 10.0x (8.0x) ​ ​ ​ ​ ​ ​ ​ Discount for lack of marketability ​ 15.0% ​ ​ ​ 400 ​ Recent transaction ​ Transaction price ​ $1.00 per share ​ ​ ​ 1,264 ​ Recent transaction and Enterprise value ​ Transaction price ​ $10.0 - 1,000.0 (482.4 per share) ​ ​ ​ ​ ​ ​ ​ EBITDA Multiple ​ 5.0x – 12.3x (8.8x) ​ ​ ​ ​ ​ ​ ​ Discount for lack of marketability ​ 15.0% ​ ​ $ 15,852 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Warrant ​ ​ 3,823 ​ Discounted cash flows and Option-pricing method ​ Discount rate ​ 19.3% ​ ​ ​ ​ ​ ​ ​ EBITDA multiple ​ 10.2x ​ ​ ​ ​ ​ ​ ​ Discount for lack of marketability ​ 15.0% ​ ​ ​ 2,432 ​ Discounted cash flows ​ Discount Rate ​ 0.5% ​ ​ ​ ​ ​ ​ ​ EBITDA Multiple ​ 0.3x ​ ​ ​ ​ ​ ​ ​ Volatility ​ 0.0% ​ ​ ​ ​ ​ ​ ​ Discount for lack of marketability ​ 0.4% ​ ​ $ 6,255 ​ ​ ​ ​ ​ ​ Total Level 3 Investments ​ $ 742,488 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ (1) Unobservable inputs were weighted by the relative fair value of the investments. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Fair Value as of ​ Valuation ​ Unobservable ​ Range Investment Type ​ December 31, 2021 ​ Techniques ​ Inputs ​ (Weighted Average) (1) First lien secured loans ​ $ 358,921 ​ Discounted cash flows ​ Discount rate ​ 4.5% – 21.8% (9.8%) ​ ​ ​ ​ ​ ​ ​ Exit EBITDA multiple ​ 5.5x – 15.0x (8.3x) ​ ​ ​ 209,892 ​ Recent transaction ​ Transaction price ​ 94.5 – 99.1 (97.9) ​ ​ ​ 113,808 ​ Discounted cash flows and Recent transaction ​ Discount rate ​ 7.2% – 10.3% (8.6%) ​ ​ ​ ​ ​ ​ ​ Transaction price ​ 97.5 – 98.8 (98.4) ​ ​ ​ ​ ​ ​ ​ Exit EBITDA multiple ​ 7.0x – 11.0x (9.5x) ​ ​ ​ 7,542 ​ Guideline public companies ​ LTM EBITDA multiple ​ 5.1x ​ ​ ​ 7,069 ​ Expected repayment ​ - ​ - ​ ​ $ 697,232 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Second lien secured loans ​ $ 18,725 ​ Discounted cash flows ​ Discount rate ​ 11.5% – 22.3% (14.2%) ​ ​ ​ ​ ​ ​ ​ Exit EBITDA multiple ​ 6.5x – 8.5x (8.0x) ​ ​ ​ 4,925 ​ Recent transaction ​ Transaction price ​ 98.5 ​ ​ $ 23,650 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Subordinated Notes ​ $ 60,000 ​ Enterprise value ​ - ​ - ​ ​ ​ 167 ​ Recent transaction ​ Transaction price ​ 100.0 ​ ​ $ 60,167 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Preferred Equity ​ $ 1,018 ​ Similar transactions ​ LTM EBITDA multiple ​ 9.7x ​ ​ ​ ​ ​ ​ ​ Discount for lack of marketability ​ 15.0% ​ ​ ​ 786 ​ Discounted cash flows and Guideline public companies ​ Discount Rate ​ 17.3% ​ ​ ​ ​ ​ ​ ​ Exit EBITDA Multiple ​ 11.0x ​ ​ ​ ​ ​ ​ ​ LTM EBITDA Multiple ​ 7.9x ​ ​ ​ ​ ​ ​ ​ NFY EBITDA Multiple ​ 7.5x ​ ​ ​ ​ ​ ​ ​ Discount for lack of marketability ​ 10.0% ​ ​ ​ 1,007 ​ Recent transaction ​ Transaction price ​ $1.00 – $56.30 ($47.13) per share ​ ​ $ 2,811 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Common Equity ​ $ 3,602 ​ Discounted cash flows ​ Discount rate ​ 13.0% – 22.7% (15.0%) ​ ​ ​ ​ ​ ​ ​ Exit EBITDA Multiple ​ 8.6x – 10.0x (9.6x) ​ ​ ​ ​ ​ ​ ​ Discount for lack of marketability ​ 10.0% – 15.0% (10.3%) ​ ​ ​ 8,124 ​ Discounted cash flows, Guideline public companies and Expected repayment ​ Discount rate ​ 14.0% – 19.0% (18.2%) ​ ​ ​ ​ ​ ​ ​ Exit EBITDA Multiple ​ 8.0x – 11.0x (10.5x) ​ ​ ​ ​ ​ ​ ​ NFY EBITDA Multiple ​ 8.6x – 10.8x (8.9x) ​ ​ ​ ​ ​ ​ ​ Discount for lack of marketability ​ 10.0% ​ ​ ​ ​ ​ ​ ​ Transaction price ​ $1.00 per share ​ ​ ​ 2,052 ​ Similar transactions ​ LTM EBITDA Multiple ​ 6.0x – 13.4x (10.5x) ​ ​ ​ 1,502 ​ Recent transaction ​ Transaction price ​ $1.00 – $1,000.00 ($289.95) per share ​ ​ $ 15,280 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Warrant ​ ​ 4,461 ​ Discounted cash flows and Option-pricing method ​ Discount rate ​ 22.7% – 29.5% (29.2%) ​ ​ ​ ​ ​ ​ ​ Exit EBITDA multiple ​ 5.5x – 8.6x (5.9x) ​ ​ ​ ​ ​ ​ ​ Volatility ​ 3.5% – 8.7% (3.6%) ​ ​ ​ ​ ​ ​ ​ Discount for lack of marketability ​ 15.0% ​ ​ $ 4,461 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total Level 3 Investments ​ $ 803,601 ​ ​ ​ ​ ​ ​ (1) Unobservable inputs were weighted by the relative fair value of the investments. ​ Valuation of investments may be determined by weighting various valuation techniques. Significant judgment is required in selecting the assumptions used to determine the fair values of these investments. The valuation methods selected for a particular investment are based on the circumstances and on the sufficiency of data available to measure fair value. If more than one valuation method is used to measure fair value, the results are evaluated and weighted, as appropriate, considering the reasonableness of the range indicated by those results. A fair value measurement is the point within that range that is most representative of fair value in the circumstances. The availability of observable inputs can vary depending on the financial instrument and is affected by a wide variety of factors, including, for example, the nature of the instrument, whether the instrument is traded on an active exchange or in the secondary market and the current market conditions. To the extent that the valuation is based on models or inputs that are less observable or unobservable in the market, the determination of fair value requires a greater degree of judgment. Accordingly, the degree of judgment exercised by the Company in determining fair value is greatest for financial instruments classified as Level 3. The determination of fair value using the selected methodologies takes into consideration a range of factors including the price at which the investment was acquired, the nature of the investment, local market conditions, trading values on public and private exchanges for comparable securities, current and projected operating performance and financing transactions subsequent to the acquisition of the investment, compliance with agreed upon terms and covenants, and assessment of credit ratings of an underlying borrower. These valuation methodologies involve a significant degree of judgment to be exercised. As it relates to investments which do not have an active public market, there is no single standard for determining the estimated fair value. Valuations of privately held investments are inherently uncertain, and they may fluctuate over short periods of time and may be based on estimates. The determination of fair value may differ materially from the values that would have been used if a ready market for these investments existed. In some cases, fair value for such investments is best expressed as a range of values derived utilizing different methodologies from which a single estimate may then be determined. Consequently, fair value for each investment may be derived using a combination of valuation methodologies that, in the judgment of the investment professionals, are most relevant to such investment. The selected valuation methodologies for a particular investment are consistently applied on each measurement date. However, a change in a valuation methodology or its application from one measurement date to another is possible if the change results in a measurement that is equally or more representative of fair value in the circumstances. The following table presents the principal amount and fair value of the Company’s borrowings as of September 30, 2022 and December 31, 2021. The fair value of the Credit Facility (as defined in Note 6) was estimated by discounting remaining payments using applicable market rates or market quotes for similar instruments at the measurement date, if available. As of September 30, 2022, the Credit Facility approximates its carrying value as the outstanding balance is callable at carrying value. The fair value of the Company’s 6.00% private notes due 2023 (the “6.000% 2023 Notes”), the 5.375% private notes due 2025 (the “5.375% 2025 Notes”), the 5.375% private notes due 2026 (the “5.375% 2026 Notes”), the 4.00% notes due 2026 (the “4.000% 2026 Notes”), the 5.625% private notes due 2027 (the “5.625% 2027 Notes”), and the 4.25% private notes due 2028 (the “4.250% 2028 Notes”) were estimated using discounted future cash flows to the valuation date. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ As of September 30, 2022 ​ As of December 31, 2021 ​ ​ Fair ​ Principal Amount ​ ​ ​ ​ Principal Amount ​ ​ ​ ​ Value Level Outstanding Fair Value Outstanding Fair Value JPM Credit Facility 3 ​ $ 246,101 ​ $ 243,552 ​ $ 291,637 ​ $ 302,147 6.000% 2023 Notes 3 ​ 30,000 ​ 29,860 ​ 30,000 ​ 31,802 5.375% 2025 Notes 3 ​ 40,000 ​ 37,355 ​ 40,000 ​ 40,687 5.375% 2026 Notes ​ 3 ​ ​ 10,000 ​ ​ 9,089 ​ ​ 10,000 ​ ​ 10,091 4.000% 2026 Notes 3 ​ 75,000 ​ 67,132 ​ 75,000 ​ 74,957 5.625% 2027 Notes 3 ​ 10,000 ​ 8,983 ​ 10,000 ​ 10,097 4.250% 2028 Notes ​ 3 ​ ​ 25,000 ​ 21,642 ​ ​ 25,000 ​ 24,861 ​ ​ ​ ​ $ 436,101 ​ $ 417,613 ​ $ 481,637 ​ $ 494,642 ​

BORROWINGS

BORROWINGS	9 Months Ended
	Sep. 30, 2022
BORROWINGS
BORROWINGS	NOTE 6 – BORROWINGS Historically, the 1940 Act has permitted the Company to issue “senior securities,” including borrowing money from banks or other financial institutions, only in amounts such that its asset coverage, as defined in the 1940 Act, equals at least 200% after such incurrence or issuance. In March 2018, the Small Business Credit Availability Act (the “SBCAA”) was enacted into law. The SBCAA, among other things, amended the 1940 Act to reduce the asset coverage requirements applicable to business development companies from 200% to 150% so long as the business development company meets certain disclosure requirements and obtains certain approvals. At the Company’s annual meeting of stockholders held on August 1, 2018, the Company’s stockholders approved the reduced asset coverage ratio from 200% to 150%, such that the Company’s maximum debt-to-equity ratio increased from a prior maximum of 1.0x (equivalent of $1 of debt outstanding for each $1 of equity) to a maximum of 2.0x (equivalent to $2 of debt outstanding for each $1 of equity). As a result, the Company’s asset coverage requirements applicable to senior securities decreased from 200% to 150%, effective August 2, 2018. As of September 30, 2022 and December 31, 2021, the Company’s asset coverage for borrowed amounts was 178.7% and 172.6%, respectively. Total borrowings outstanding and available as of September 30, 2022, were as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Maturity Rate Principal Amount Outstanding Amortized Cost Available JPM Credit Facility 11/22/2025 L+2.35 % $ 246,101 ​ $ 243,552 ​ $ 88,899 6.000% 2023 Notes 8/7/2023 6.00 % 30,000 ​ 29,849 ​ — 5.375% 2025 Notes 10/20/2025 5.375 % 40,000 ​ 39,596 ​ — 5.375% 2026 Notes 12/4/2026 5.375 % 10,000 ​ 9,878 ​ — 4.000% 2026 Notes 12/15/2026 4.00 % 75,000 ​ 73,567 ​ — 5.625% 2027 Notes 12/4/2027 5.625 % 10,000 ​ 9,870 ​ — 4.250% 2028 Notes ​ 12/6/2028 ​ 4.25 % ​ 25,000 ​ ​ 24,680 ​ ​ — Total debt ​ ​ ​ ​ $ 436,101 ​ $ 430,992 ​ $ 88,899 ​ Total borrowings outstanding and available as of December 31, 2021, were as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Maturity Rate Principal Amount Outstanding Amortized Cost Available JPM Credit Facility 11/22/2025 L+2.35 % $ 291,637 ​ $ 288,985 ​ $ 43,363 6.000% 2023 Notes 8/7/2023 6.00 % 30,000 ​ 29,717 ​ — 5.375% 2025 Notes 10/20/2025 5.375 % 40,000 ​ 39,497 ​ — 5.375% 2026 Notes 12/4/2026 5.375 % 10,000 ​ 9,856 ​ — 4.000% 2026 Notes 12/15/2026 4.00 % 75,000 ​ 73,404 ​ — 5.625% 2027 Notes 12/4/2027 5.625 % 10,000 ​ 9,851 ​ — 4.250% 2028 Notes ​ 12/6/2028 ​ 4.25 % ​ 25,000 ​ ​ 24,648 ​ ​ — Total debt ​ ​ ​ ​ $ 481,637 ​ $ 475,958 ​ $ 43,363 ​ Credit Facility On December 21, 2020, the terms of the Credit Facility were amended to, among other things, (i) increase the minimum funding amount from $175,000 to $200,000, (ii) increase the size of the facility from $250,000 to $285,000 and retain an accordion feature which allows for the expansion of the borrowing limit up to $350,000 and (iii) provide for the implementation of certain changes relating to the transition away from LIBOR in the market. On April 28, 2021, the terms of the Credit Facility were amended and restated to, among other things, enable WhiteHorse Credit to borrow in British Pounds or Euros. On July 15, 2021, the terms of the Credit Facility were amended to, among other things, allow WhiteHorse Credit to reduce the applicable margins for interest rates to 2.35%, extend the non-call period from November 22, 2021 to November 22, 2022, extend the end of the reinvestment period from November 22, 2023 to November 22, 2024 and extend the scheduled termination date from November 22, 2024 to November 22, 2025. On October 4, 2021, the terms of the Credit Facility were amended to, among other things, established a temporary upsize to the borrowing capacity under the Credit Facility, which allowed WhiteHorse Credit to borrow up to $335,000 for a three-month period beginning on October 4, 2021. On January 4, 2022, the terms of the Credit Facility were amended to, among other things, continue to establish a temporary upsize to the borrowing capacity under the Credit Facility, which allowed WhiteHorse Credit to borrow up to $335,000 for a four-month period that originally began on October 4, 2021. On February 4, 2022, the terms of the Credit Facility were further amended to, among other things (i) increase WhiteHorse Credit’s availability under the Credit Facility from $285,000 to $310,000 (the “$25,000 Increase”), (ii) increase the minimum funding amount from $200,000 to $217,000, (iii) extend an additional temporary increase of $25,000 in availability under the Credit Facility, allowing WhiteHorse Credit to borrow up to $335,000 through April 4, 2022 (the “$25,000 Temporary Increase”), and (iv) apply an annual interest rate equal to applicable SOFR plus 2.50% to any borrowings under the $25,000 Increase in the Credit Facility and the $25,000 Temporary Increase in availability under the Credit Facility. On March 30, 2022, the terms of the Credit Facility were further amended to, among other things: (i) increase WhiteHorse Credit’s availability under the Credit Facility from $310,000 to $335,000; (ii) retain an accordion feature which allows for the expansion of the borrowing limit up to $375,000; and (iii) increase the minimum funding amount from $217,000 to $234,500. The Credit Facility bears interest at LIBOR plus 2.35% on outstanding USD denominated borrowings up to $285,000 and SOFR plus 2.50% on borrowings above $285,000. The Credit Facility bears interest at EURIBOR for EUR denominated borrowings, CDOR for CAD denominated borrowings, SONIA for GBP denominated, plus, in each case, a spread of 2.35% on outstanding borrowings. The Company is required to pay a non-usage fee which accrues at 0.75% per annum on the average daily unused amount of the financing commitments to the extent the aggregate principal amount available under the Credit Facility has not been borrowed. The minimum borrowing requirement is $234,500. In connection with the Credit Facility, WhiteHorse Credit pledged securities as collateral with a fair value of approximately $621,365 as of September 30, 2022. The Credit Facility has a maturity date of November 22, 2025. Under the Credit Facility, the Company has made certain customary representations and warranties and is required to comply with various covenants, including leverage restrictions, reporting requirements and other customary requirements for similar credit facilities. As of September 30, 2022, the Company had $246,101 in outstanding borrowings and $88,899 undrawn under the Credit Facility. Weighted average outstanding borrowings were $245,920 and $271,393 at a weighted average interest rate of 4.48% and 3.42% for the three and nine months ended September 30, 2022. As of September 30, 2022, the interest rate in effect on outstanding borrowings was 5.61%. The Company’s ability to draw down undrawn funds under the Credit Facility is determined by collateral and portfolio quality requirements stipulated in the credit and security agreement. As of September 30, 2022, $88,899 was available to be drawn by the Company based on these requirements. As of December 31, 2021, the Company had $291,637 in outstanding borrowings and $43,363 undrawn under the Credit Facility. As of December 31, 2021, the weighted average outstanding borrowings were $245,934 at a weighted average interest rate of 2.60%. As of December 31, 2021, the interest rate in effect on outstanding borrowings was 2.55%. The Company’s ability to draw down undrawn funds under the Credit Facility is determined by collateral and portfolio quality requirements stipulated in the credit and security agreement. As of December 31, 2021, $43,363 was available to be drawn by the Company based on these requirements. 6.000% 2023 Notes 5.375% 2025 Notes 5.375% 2026 Notes 4.000% 2026 Notes 5.625% 2027 Notes outstanding and future unsecured unsubordinated indebtedness issued by the Company. The Company used the net proceeds from this offering to redeem existing debt. 4.250% 2028 Notes 2025 Public Notes

RELATED PARTY TRANSACTIONS

RELATED PARTY TRANSACTIONS	9 Months Ended
	Sep. 30, 2022
RELATED PARTY TRANSACTIONS
RELATED PARTY TRANSACTIONS	NOTE 7 - RELATED PARTY TRANSACTIONS Investment Advisory Agreement ● determines the composition of the investment portfolio, the nature and timing of the changes to the portfolio and the manner of implementing such changes; ● identifies, evaluates and negotiates the structure of the investments the Company makes (including performing due diligence on the Company’s prospective portfolio companies); and ● closes, monitors and administers the investments the Company makes, including the exercise of any voting or consent rights. In addition, WhiteHorse Advisers provides the Company with access to personnel and an Investment Committee. Under the Investment Advisory Agreement, the Company pays WhiteHorse Advisers a fee for investment management services consisting of a base management fee and an incentive fee. The Investment Advisory Agreement may be terminated by either party without penalty upon 60 days’ written notice to the other party. Base Management Fee The base management fee is calculated at an annual rate equal to 2.0% based on the Company’s consolidated gross assets (including cash and cash equivalents and assets purchased with borrowed funds); provided, however, the base management fee will be calculated at an annual rate equal to 1.25% of the Company’s consolidated gross assets (including cash and cash equivalents and assets purchased with borrowed funds), that exceed the product of (i) 200% and (ii) the value of the Company’s total net assets, at the end of the two most recently completed calendar quarters. Base management fees are payable quarterly in arrears and are appropriately pro-rated for any partial month or quarter. The following table details our management fee expenses for the three and nine months ended September 30, 2022 and 2021: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three months ended September 30, ​ ​ Nine months ended September 30, Management Fee ($ in thousands) ​ 2022 ​ ​ 2021 ​ 2022 ​ ​ 2021 Base management fee ​ $ 3,881 ​ $ 3,508 ​ $ 11,741 ​ $ 10,209 Base management fee waived ​ ​ — ​ ​ — ​ ​ — ​ ​ — Total management fees ​ $ 3,881 ​ $ 3,508 ​ $ 11,741 ​ $ 10,209 ​ As of September 30, 2022 and December 31, 2021, management fees payable on the consolidated statements of assets and liabilities were $ 3,881 and $ 3,766 , respectively. Performance-based Incentive Fee The performance-based incentive fee consists of two components that are independent of each other, except as provided by the Incentive Fee Cap and Deferral Mechanism discussed below. The calculations of these two components have been structured to include a fee limitation such that no incentive fee will be paid to the investment adviser for any quarter if, after such payment, the cumulative incentive fees paid to the investment adviser for the period that includes the current fiscal quarter and the 11 full preceding fiscal quarters, referred to as the “Incentive Fee Look-back Period,” would exceed 20.0% of the Cumulative Pre-Incentive Fee Net Return (as defined below) during the Incentive Fee Look-back Period. Each quarterly incentive fee is subject to the Incentive Fee Cap (as defined below) and a deferral mechanism through which the investment adviser may recap a portion of such deferred incentive fees, which is referred to together as the “Incentive Fee Cap and Deferral Mechanism.” This limitation is accomplished by subjecting each incentive fee payable to a cap, which is referred to as the “Incentive Fee Cap.” The Incentive Fee Cap in any quarter is equal to (a) 20.0% of Cumulative Pre-Incentive Fee Net Return during the Incentive Fee Look-back Period less (b) cumulative incentive fees of any kind paid to the investment adviser during the Incentive Fee Look-back Period. To the extent the Incentive Fee Cap is zero or a negative value in any quarter, the Company will pay no incentive fee to its investment adviser in that quarter. The Company will only pay incentive fees to the extent allowed by the Incentive Fee Cap and Deferral Mechanism. To the extent that the payment of incentive fees is limited by the Incentive Fee Cap and Deferral Mechanism, the payment of such fees may be deferred and paid in subsequent quarters up to three years after their date of deferment, subject to applicable limitations included in the Investment Advisory Agreement. The deferral component of the Incentive Fee Cap and Deferral Mechanism may cause incentive fees that accrued during one fiscal quarter to be paid to the investment adviser at any time during the 11 full fiscal quarters following such initial full fiscal quarter. The “Cumulative Pre-Incentive Fee Net Return” refers to the sum of (a) Pre-Incentive Fee Net Investment Income (as defined below) for each period during the Incentive Fee Look-back Period and (b) the sum of cumulative realized capital gains, cumulative realized capital losses, cumulative unrealized capital depreciation and cumulative unrealized capital appreciation during the applicable Incentive Fee Look-back Period. The first component, which is income-based (the “Income Incentive Fee”), is calculated and payable quarterly in arrears and is determined based on Pre-Incentive Fee Net Investment Income for the immediately preceding calendar quarter, subject to the Incentive Fee Cap and Deferral Mechanism. For this purpose, “Pre-Incentive Fee Net Investment Income” means, in each case on a consolidated basis, interest income, distribution income and any other income (including any other fees (other than fees for providing managerial assistance), such as commitment, origination, structuring, diligence and consulting fees or other fees received from portfolio companies) accrued during the calendar quarter, minus the Company’s operating expenses for the quarter (including the base management fee, expenses payable under the administration agreement (the “Administration Agreement”), any interest expense and any dividends paid on any issued and outstanding preferred stock, but excluding the incentive fee). Pre-Incentive Fee Net Investment Income does not include any realized capital gains, realized capital losses or unrealized capital appreciation or depreciation. The operation of the first component of the incentive fee for each quarter is as follows: ● no incentive fee is payable to the Company’s investment adviser in any calendar quarter in which Pre-Incentive Fee Net Investment Income does not exceed the “Hurdle Rate” of 1.75% (7.00% annualized); ● 100% of Pre-Incentive Fee Net Investment Income with respect to that portion of such Pre-Incentive Fee Net Investment Income, if any, that exceeds the Hurdle Rate but is less than 2.1875% in any calendar quarter (8.75% annualized) is payable to the Company’s investment adviser. This portion of the Company’s Pre-Incentive Fee Net Investment Income (which exceeds the Hurdle Rate but is less than 2.1875%) is referred to as the “catch-up.” The effect of the catch-up is that, if such Pre-Incentive Fee Net Investment Income exceeds 2.1875% in any calendar quarter, the investment adviser will receive 20% of such Pre-Incentive Fee Net Investment Income as if the Hurdle Rate did not apply; and ● 20% of the amount of such Pre-Incentive Fee Net Investment Income, if any, that exceeds 2.1875% in any calendar quarter (8.75% annualized) is payable to the Company’s investment adviser (once the Hurdle Rate is reached and the catch-up is achieved, 20% of all Pre-Incentive Fee Net Investment Income). The portion of such incentive fee that is attributable to deferred interest (such as PIK interest or original issue discount) will be paid to the investment adviser, together with interest from the date of deferral to the date of payment, only if and to the extent that the Company actually receives such interest in cash, and any accrual will be reversed if and to the extent such interest is reversed in connection with any write-off or similar treatment of the investment giving rise to any deferred interest accrual. Any reversal of such amounts would reduce net income for the quarter by the net amount of the reversal (after taking into account the reversal of incentive fees payable) and would result in a reduction and possibly elimination of the incentive fees for such quarter. There is no accumulation of amounts on the Hurdle Rate from quarter to quarter and, accordingly, there is no clawback of amounts previously paid if subsequent quarters are below the quarterly Hurdle Rate and there is no delay of payment if prior quarters are below the quarterly Hurdle Rate. Since the Hurdle Rate is fixed, as interest rates rise, it will be easier for the investment adviser to surpass the Hurdle Rate and receive an incentive fee based on Pre-Incentive Fee Net Investment Income. Net investment income used to calculate this component of the incentive fee is also included in the amount of consolidated gross assets used to calculate the base management fee. These calculations will be appropriately prorated for any period of less than three months and adjusted for any share issuances or repurchases during the current quarter. The second component, the capital gains component of the incentive fee (the “Capital Gains Incentive Fee”), which is determined and payable in arrears as of the end of each calendar year (or upon termination of the Investment Advisory Agreement, as of the termination date), commenced on January 1, 2013, and equals 20% of cumulative aggregate realized capital gains from January 1 through the end of each calendar year, computed net of aggregate cumulative realized capital losses and aggregate cumulative unrealized capital depreciation through the end of each year (the “Capital Gains Incentive Fee Base”), less the aggregate amount of any previously paid capital gains incentive fees and subject to the Incentive Fee Cap and Deferral Mechanism. If such amount is negative, then no capital gains incentive fee will be payable for the year. Additionally, if the Investment Advisory Agreement is terminated as of a date that is not a calendar year end, the termination date will be treated as though it were a calendar year end for purposes of calculating and paying the capital gains incentive fee. The capital gains component of the incentive fee is not subject to any minimum return to stockholders. In accordance with GAAP, the Company is also required to include the aggregate unrealized capital appreciation on investments in the calculation and accrue a capital gains incentive fee on a quarterly basis if such unrealized capital appreciation were realized, even though such unrealized capital appreciation is not permitted to be considered in calculating the fee actually payable under the Investment Advisory Agreement. If the Capital Gains Incentive Fee Base, adjusted as required by GAAP to include unrealized capital appreciation, is positive at the end of a reporting period, then GAAP requires the Company to accrue a Capital Gains Incentive Fee equal to 20% of such amount, less the aggregate amount of any Capital Gains Incentive Fees previously paid and Capital Gains Incentive Fees accrued under GAAP in all prior periods. If such amount is negative, then there is no accrual for such period. The resulting accrual under GAAP in a given period may result in either additional expense (if such cumulative amount is greater than in the prior period) or a reversal of previously recorded expense (if such cumulative amount is less than in the prior period). There can be no assurance that such unrealized capital appreciation will be realized in the future. Because of the structure of the incentive fee, it is possible that the Company may pay an incentive fee in a quarter where it incurs a loss subject to the Incentive Fee Cap and Deferral Mechanism. For example, if the Company receives Pre-Incentive Fee Net Investment Income in excess of the Hurdle Rate, it will pay the applicable Income Incentive Fee even after incurring a loss in that quarter due to realized and unrealized capital losses. The following table provides a breakdown of the performance-based incentive fees for the three and nine months ended September 30, 2022 and 2021: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three months ended September 30, ​ ​ Nine months ended September 30, Performance-based Incentive Fee ($ in thousands) ​ 2022 ​ ​ 2021 ​ 2022 ​ ​ 2021 Income incentive fee ​ $ 2,159 ​ $ 1,942 ​ $ 6,094 ​ $ 5,616 Capital gains incentive fee ​ ​ (1,132) ​ ​ 127 ​ ​ (1,803) ​ ​ 1,123 Performance-based incentive fees waived ​ ​ — ​ ​ — ​ ​ — ​ ​ — Total performance-based incentive fees ​ $ 1,027 ​ $ 2,069 ​ $ 4,291 ​ $ 6,739 ​ As of September 30, 2022 and December 31, 2021, incentive fees payable on the consolidated statements of assets and liabilities were $4,335 and $7,958, respectively. Administration Agreement Substantially all the Company’s payments of operating expenses to third parties were made by a related party, for which such third party received reimbursement from the Company. During the three and nine months ended September 30, 2022, the Company incurred $171 and $512 of allocated administrative service fees, respectively. During the three and nine months ended September 30, 2021, the Company incurred $171 and $512 of allocated administrative service fees, respectively. Co-investments with Related Parties As of September 30, 2022 and December 31, 2021, certain funds affiliated with WhiteHorse Advisers and its related entities maintained co-investments in the Company’s investments of $4,388,279 and $4,502,807, respectively. STRS JV

COMMITMENTS AND CONTINGENCIES

COMMITMENTS AND CONTINGENCIES	9 Months Ended
	Sep. 30, 2022
COMMITMENTS AND CONTINGENCIES
COMMITMENTS AND CONTINGENCIES	NOTE 8 - COMMITMENTS AND CONTINGENCIES Commitments The balance of unfunded commitments to extend credit was $37,031 and $53,113 as of September 30, 2022 and December 31, 2021, respectively. Commitments to extend credit consist principally of the unused portions of commitments that obligate the Company to extend credit, such as revolving credit arrangements or similar transactions. These commitments are often subject to financial or non-financial milestones and other conditions to borrow that must be achieved before the commitment can be drawn. In addition, the commitments generally have fixed expiration dates or other termination clauses. Since commitments may expire without being drawn upon, the total commitment amounts do not necessarily represent future cash requirements. ​ The following table summarizes the Company’s unfunded commitments as of September 30, 2022 and December 31, 2021: ​ ​ ​ ​ ​ ​ ​ ​ Unfunded Commitments (1) ($ in thousands) As of September 30, 2022 As of December 31, 2021 Revolving Loan Commitments: ​ ​ ​ ​ ​ ​ ABB/Con-cise Optical Group LLC (d/b/a ABB Optical Group, LLC) ​ $ 158 ​ $ — Bridgepoint Healthcare, LLC ​ ​ 1,588 ​ ​ 1,588 Camp Facility Services Holdings, LLC (d/b/a Camp Construction Services, Inc.) ​ ​ — ​ ​ 2,031 Claridge Products and Equipment, LLC ​ ​ 56 ​ ​ 491 Coastal Television Broadcasting Group LLC ​ ​ 309 ​ ​ 309 EducationDynamics, LLC ​ ​ 960 ​ ​ 1,199 Epiphany Business Services, LLC (d/b/a Epiphany Dermatology, PA) ​ ​ — ​ ​ 438 I&I Sales Group, LLC (d/b/a Avision Sales Group) ​ ​ — ​ ​ 619 HC Salon Holdings, Inc. (d/b/a Hair Cuttery) ​ ​ 700 ​ ​ 700 HRG Management, LLC (d/b/a HomeRiver Group, LLC) ​ ​ — ​ ​ 1,083 Industrial Specialty Services USA LLC ​ ​ 295 ​ ​ 1,182 Inspired Beauty Brands, Inc. ​ ​ 531 ​ ​ 531 ITS Buyer Inc. (d/b/a ITS Logistics, LLC) ​ ​ — ​ ​ 592 IvyRehab Intermediate II, LLC (d/b/a Ivy Rehab) ​ ​ — ​ ​ 403 Juniper Landscaping Holdings LLC ​ ​ — ​ ​ 597 LHS Borrower, LLC (d/b/a Leaf Home, LLC) ​ ​ — ​ ​ 560 LMG Holdings, Inc. ​ ​ — ​ ​ 414 Max Solutions Inc. (1) ​ ​ 161 ​ ​ — Max Solutions Inc. ​ ​ 1,212 ​ ​ — Motivational Marketing, LLC (d/b/a Motivational Fulfillment) ​ ​ 1,182 ​ ​ 1,182 MSI Information Services, Inc. ​ ​ 750 ​ ​ — Naviga Inc. (f/k/a Newscycle Solutions, Inc.) ​ ​ 34 ​ ​ 132 PFB Holdco, Inc. (d/b/a PFB Corporation) (1) ​ ​ 882 ​ ​ 963 PFB Holdco, Inc. (d/b/a PFB Corporation) ​ ​ 296 ​ ​ 296 PG Dental New Jersey Parent, LLC ​ ​ 352 ​ ​ 232 Power Service Group CR Acquisition Inc. (d/b/a Power Plant Services) ​ ​ 3,030 ​ ​ 3,030 RLJ Pro-Vac, Inc. (d/b/a Pro-Vac) ​ ​ — ​ ​ 1,013 Sleep OpCo LLC (d/b/a Brooklyn Bedding LLC) ​ ​ 2,646 ​ ​ 2,646 Telestream Holdings Corporation ​ ​ 397 ​ ​ 795 The Kyjen Company, LLC (d/b/a Outward Hound) ​ ​ 262 ​ ​ 554 Trimlite Buyer LLC (d/b/a Trimlite LLC) ​ ​ — ​ ​ 1,473 Total unfunded revolving loan commitments ​ ​ 15,801 ​ ​ 25,053 ​ ​ ​ ​ ​ ​ ​ Delayed Draw Loan Commitments: ​ ​ ​ ​ ​ ​ BBQ Buyer, LLC (d/b/a BBQ Guys) ​ ​ — ​ ​ 854 Bridgepoint Healthcare, LLC ​ ​ 794 ​ ​ 794 Camp Facility Services Holdings, LLC (d/b/a Camp Construction Services, Inc.) ​ ​ 4,063 ​ ​ 4,063 DCA Investment Holding, LLC (d/b/a Dental Care Alliance, LLC) ​ ​ — ​ ​ 1,062 EducationDynamics, LLC ​ ​ 1,709 ​ ​ 1,709 Empire Office, Inc. ​ ​ — ​ ​ 4,926 Grupo HIMA San Pablo, Inc. ​ ​ — ​ ​ 667 HRG Management, LLC (d/b/a HomeRiver Group, LLC) ​ ​ — ​ ​ 1,514 I&I Sales Group, LLC (d/b/a Avision Sales Group) ​ ​ — ​ ​ 2,699 IvyRehab Intermediate II, LLC (d/b/a Ivy Rehab) ​ ​ — ​ ​ 1,188 Juniper Landscaping Holdings LLC ​ ​ — ​ ​ 2,387 JZ Capital Partners Ltd. ​ ​ 5,714 ​ ​ — Max Solutions Inc. ​ ​ 2,755 ​ ​ — PlayMonster LLC ​ ​ — ​ ​ 2,867 Power Service Group CR Acquisition Inc. (d/b/a Power Plant Services) ​ ​ 2,090 ​ ​ — Solar Holdings Bidco Limited (1)(2) ​ ​ 3,700 ​ ​ — Source Code Holdings, LLC (d/b/a Source Code Corporation) ​ ​ — ​ ​ 2,185 Telestream Holdings Corporation ​ ​ 346 ​ ​ — True Blue Car Wash, LLC ​ ​ 59 ​ ​ 1,145 Total unfunded delayed draw loan commitments ​ ​ 21,230 ​ ​ 28,060 Total Unfunded Commitments ​ $ 37,031 ​ $ 53,113 (1) Unfunded commitments denominated in non-USD currencies have been converted to USD using the exchange rate as of the applicable reporting date. (2) Principal amount is non-USD denominated and is based in British pounds. At the option of the borrower, amounts borrowed under the delayed draw term loan commitment can be US dollars, Canadian dollars or British pounds. ​ As of September 30, 2022, the Company had commitments to fund equity interests and subordinated notes in STRS JV of $20,000 and $80,000, respectively, both of which were fully funded. As of December 31, 2021, the Company had commitments to fund equity interests and subordinated notes in STRS JV of $15,000 and $60,000, respectively, both of which were fully funded. The capital commitments cannot be drawn without an affirmative vote by both the Company’s and STRS Ohio’s representatives on STRS JV’s board of managers. Indemnification Legal Proceedings COVID-19 Developments

STOCKHOLDERS' EQUITY

STOCKHOLDERS' EQUITY	9 Months Ended
	Sep. 30, 2022
STOCKHOLDERS' EQUITY
STOCKHOLDERS' EQUITY	NOTE 9 - STOCKHOLDERS’ EQUITY On March 15, 2021, the Company launched an “at-the-market” offering (the “ATM Program”) by entering into an Equity Distribution Agreement with Raymond James & Associates, Inc. pursuant to which the Company may offer and sell, from time to time, through Raymond James & Associates, Inc., as the sales agent, shares of its common stock having an aggregate offering amount of up to $35,000. ​ Since the commencement of the ATM Program, the Company sold 276,360 shares of its common stock under the ATM Program at a weighted-average price of $15.77 per share, which amounted to $4,359 in gross proceeds. The Company received net proceeds of $4,272 after deducting commissions to the sales agent, but before offering expenses. As of September 30, 2022, the Company had $30,641 available under the ATM Program. As of December 31, 2021, the Company had $30,893 available under the ATM Program. ​ On October 25, 2021, the Company completed an offering of 1,900,000 shares of our common stock at a public offering price of $15.81 per share, inclusive of underwriting discounts and commissions. The issuance of 1,900,000 shares resulted in net proceeds to the Company of $29,374, inclusive of underwriting discounts and commissions and before offering expenses. In connection with the offering, the Company granted the underwriters an overallotment option to purchase up to an additional 285,000 shares of the Company’s common stock. On November 3, 2021, the Company raised an additional $4,326 from the issuance of an additional 282,300 shares pursuant to the underwriters’ exercise of the overallotment option to purchase additional shares. WhiteHorse Advisers agreed to bear a portion of the underwriting discounts and commissions in connection with the offering, such that the issuance of the 2,182,300 shares (which includes the additional shares issued pursuant to the overallotment option) resulted in net proceeds to the Company of $33,700 before offering expenses, which was at or above the Company’s net ass value per share at the time of the offering and the overallotment option. The following table summarizes the total shares issued and proceeds received, before offering expenses, relating to the issuance of shares of the Company’s common stock from the DRIP and pursuant to the ATM Program for the three and nine months ended September 30, 2022 and 2021: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three months ended September 30, Nine months ended September 30, ($ in thousands except share and per share amounts) 2022 2021 2022 2021 Shares Issued from Equity Offering ​ ​ — ​ — ​ ​ — ​ — Shares Issued from ATM Program ​ — ​ 94,897 ​ ​ 16,678 ​ 256,952 Shares Issued from DRIP ​ — ​ 119,381 ​ ​ 63,743 ​ 133,890 Total Shares Issued ​ ​ — ​ ​ 214,278 ​ ​ 80,421 ​ ​ 390,842 Proceeds, before offering expenses ​ $ — ​ $ 3,320 ​ $ 1,225 ​ $ 6,113 Average Price Per Share (1) ​ $ — ​ $ 15.49 ​ $ 15.23 ​ $ 15.64 ​ ​ (1) No shares were issued during the three months ended September 30, 2022. The average price per share for the nine months ended September 30, 2022 inclusive of offering expenses, was $13.72 . The average price per share for the three and nine months ended September 30, 2021 inclusive of offering expenses, was 15.22 and $15.27 per share, respectively.

FINANCIAL HIGHLIGHTS

FINANCIAL HIGHLIGHTS	9 Months Ended
	Sep. 30, 2022
FINANCIAL HIGHLIGHTS
FINANCIAL HIGHLIGHTS	NOTE 10 - FINANCIAL HIGHLIGHTS The following is a schedule of financial highlights: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Nine months ended September 30, ​ ​ 2022 2021 Per share data: (1) ​ ​ ​ Net asset value, beginning of period ​ $ 15.10 $ 15.23 ​ Investment operations: ​ ​ ​ Net investment income ​ 1.13 ​ 1.03 ​ Net realized and unrealized gains(losses) on investments and foreign currency transactions ​ ​ (0.40) ​ ​ 0.27 ​ Net increase in net assets resulting from operations ​ 0.73 ​ 1.30 ​ Distributions declared from net investment income ​ (1.07) ​ (1.07) ​ Net asset value, end of period ​ $ 14.76 $ 15.46 ​ Total annualized return based on market value (2) ​ (37.95) % ​ 15.82 % Total annualized return based on net asset value ​ 6.49 % ​ 11.26 % Net assets, end of period ​ $ 343,019 ​ $ 323,724 ​ Per share market value at end of period ​ $ 11.10 ​ $ 15.22 ​ Shares outstanding end of period ​ 23,243,088 ​ 20,936,874 ​ Ratios/Supplemental Data: (3) ​ ​ ​ Ratio of expenses before incentive fees to average net assets (4) ​ 11.95 % 10.70 % Ratio of incentive fees to average net assets ​ 1.64 % 2.81 % Ratio of total expenses to average net assets (4) ​ 13.59 % 13.51 % Ratio of net investment income to average net assets (4) ​ 10.05 % 8.91 % Portfolio turnover ratio ​ 28.41 % 49.34 % (1) Based on actual number of shares outstanding at the end of the period or the weighted average shares outstanding for the period, unless otherwise noted, as appropriate. (2) Total return is based on the change in market price per share during the period and takes into account distributions, if any, reinvested in accordance with the DRIP. (3) With the exception of the portfolio turnover rate, ratios are reported on an annualized basis. (4) Calculated using total expenses, including income tax provision. ​ Financial highlights are calculated for each securities class taken as a whole. An individual stockholder’s return and ratios may vary based on the timing of capital transactions.

CHANGE IN NET ASSETS RESULTING

CHANGE IN NET ASSETS RESULTING FROM OPERATIONS PER COMMON SHARE	9 Months Ended
	Sep. 30, 2022
CHANGE IN NET ASSETS RESULTING FROM OPERATIONS PER COMMON SHARE
CHANGE IN NET ASSETS RESULTING FROM OPERATIONS PER COMMON SHARE	NOTE 11 - CHANGE IN NET ASSETS RESULTING FROM OPERATIONS PER COMMON SHARE The following information sets forth the computation of the basic and diluted per share net increase in net assets resulting from operations: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended September 30, ​ Nine Months Ended September 30, ($ in thousands except share and per share amounts) 2022 2021 2022 2021 Net increase in net assets resulting from operations ​ $ 3,845 ​ $ 8,275 ​ $ 16,901 ​ $ 26,951 Weighted average shares outstanding ​ 23,243,088 ​ 20,851,435 ​ 23,224,990 ​ 20,677,545 Basic and diluted per share net increase in net assets resulting from operations ​ $ 0.17 ​ $ 0.40 ​ $ 0.73 ​ $ 1.30 ​

SUBSEQUENT EVENTS

SUBSEQUENT EVENTS	9 Months Ended
	Sep. 30, 2022
SUBSEQUENT EVENTS
SUBSEQUENT EVENTS	NOTE 12 - SUBSEQUENT EVENTS The Company’s management has evaluated events that have occurred after the balance sheet date but before the consolidated financial statements are issued and, other than the items discussed below, has determined that there were no additional subsequent events requiring adjustment or disclosure in the consolidated financial statements. On October 14, 2022, the Company declared a special distribution of $0.05 per share, which will be payable on December 9, 2022 to stockholders of record as of October 31, 2022. On November 10, 2022, the Company’s board of directors approved amended and restated bylaws that revise Section 2.8 of the bylaws regarding the preparation of voting lists in advance of stockholder meetings to conform to recent amendments to the Delaware General Corporation Law regarding preparation of such lists. ​

SUMMARY OF SIGNIFICANT ACCOUN_2

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	9 Months Ended
	Sep. 30, 2022
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Basis of Presentation	Basis of Presentation Financial Services - Investment Companies Additionally, the accompanying consolidated financial statements and related financial information have been prepared pursuant to the requirements for reporting on Form 10-K and Articles 6, 10 and 12 of Regulation S-X. In the opinion of management, the consolidated financial statements reflect all adjustments, consisting solely of normal recurring accruals considered necessary for the fair presentation of financial results as of and for the periods presented.
Principles of Consolidation	Principles of Consolidation
Use of Estimates	Use of Estimates
Fair Value of Financial Instruments:	Fair Value of Financial Instruments Fair Value Measurements and Disclosures. The Company values its investments in accordance with the 1940 Act and Rule 2a-5 thereunder, which sets forth the requirements for determining fair value in good faith. Pursuant to Rule 2a-5, the board of directors has designated the Investment Adviser to determine the fair value of the Company’s investments. The board of directors oversees the Investment Adviser’s performance of its valuation responsibilities, and in support of this oversight, the Investment Adviser provides periodic reports to the Company’s board of directors related to the fair valuation process. The Investment Adviser carries out its responsibilities as valuation designee primarily through its valuation committee (the “Valuation Committee”), assisted by third-party valuation firms, administrative personnel, and other service providers, as appropriate. The Valuation Committee consists of a number of representatives from different functions of the Investment Adviser. The Investment Adviser conducts the fair valuation process on a quarterly basis, subject to the oversight of the Company’s board of directors through the audit committee, using consistently applied valuation procedures. In accordance with the Company’s valuation procedures, the Investment Adviser performs periodic testing of the appropriateness and accuracy of fair value methodologies, and has established a process for approving, monitoring, and evaluating independent pricing service providers. Effective September 8, 2022, the board of directors designated the Investment Adviser as the Company’s valuation designee. Investments that are not publicly traded or for which market prices are not readily available will be valued based on the input of the Investment Adviser and independent third-party valuation firms engaged to review Company investments. These external reviews are used by the Company’s Investment Adviser, subject to the oversight of the board of directors, to review the Company’s internal valuation of investments during the year.
Investment Transactions	Investment Transactions
Foreign currency translation	Foreign currency translation (1) cash and cash equivalents, restricted cash and cash equivalents, fair value of investments, interest receivable, and other assets and liabilities — at the spot exchange rate on the last business day of the period; and (2) purchases and sales of investments, income and expenses — at the exchange rates prevailing on the respective dates of such transactions. Although net assets and fair values are presented based on the applicable foreign exchange rates described above, the Company does not isolate that portion of the results of operations resulting from changes in foreign exchange rates on investments from the fluctuations arising from changes in fair values of investments held. Such fluctuations are included with the net realized and unrealized gain or loss from investments. Fluctuations arising from the translation of assets other than investments and liabilities are included with the net change in unrealized appreciation (depreciation) on translation of assets and liabilities in foreign currencies on the consolidated statements of operations. Foreign security and currency transactions may involve certain considerations and risks not typically associated with investing in U.S. companies. These risks include, but are not limited to, currency fluctuations and revaluations and future adverse political, social and economic developments, which could cause investments in foreign markets to be less liquid and prices to be more volatile than those of comparable U.S. companies or U.S. government securities.
Revenue Recognition	Revenue Recognition Sales Investment Income Dividend income is recorded on the record date for private portfolio companies or on the ex-dividend date for publicly traded portfolio companies. Closing fees associated with investments in portfolio companies are deferred and recognized as interest income over the respective terms of the applicable loans. Upon the prepayment of a loan or debt security, any unamortized loan closing fees are recorded as part of interest income. Commitment fees are based upon the undrawn portion committed by the Company and are recorded as interest income on an accrual basis. Prepayment, amendment and other fees are recognized when earned, generally when such fees are receivable, and are included in fee income on the consolidated statements of operations. The Company may invest in loans that contain a PIK interest rate provision. PIK interest is accrued at the contractual rates and added to loan principal on the reset dates to the extent such amounts are expected to be collected. Non-accrual loans
Cash and Cash Equivalents	Cash and Cash Equivalents
Restricted Cash and Cash Equivalents	Restricted Cash and Cash Equivalents
Offering Costs	Offering Costs
Deferred Financing Costs	Deferred Financing Costs the consolidated statements of assets and liabilities as a direct reduction from the carrying amount of the related debt liability.
Income Taxes	Income Taxes The Company recognizes the financial statement benefit of a tax position only after determining that the relevant tax authority would more-likely-than-not sustain the position following an audit. For tax positions meeting the more-likely-than-not threshold, the amount recognized in the financial statement is the largest benefit or expense that has a greater than 50% likelihood of being realized upon ultimate settlement with the relevant tax authority. Any tax positions not deemed to satisfy the more-likely-than-not threshold are reversed and recorded as tax benefit or tax expense, as appropriate, in the current year. Management has analyzed the Company’s tax positions, and the Company has concluded that the Company did not have any unrecognized tax benefits or unrecognized tax liabilities related to uncertain tax positions as of September 30, 2022 and December 31, 2021. Penalties or interest that may be assessed related to any income taxes would be classified as general and administrative expenses on the consolidated statements of operations. The Company had no amounts accrued for interest or penalties as of September 30, 2022 or December 31, 2021. The Company does not expect the total amount of unrecognized tax benefits to significantly change in the next twelve months. The Company’s tax returns are subject to examination by federal, state and local taxing authorities. Because many types of transactions are susceptible to varying interpretations under U.S. federal and state income tax laws and regulations, the amounts reported in the accompanying consolidated financial statements may be subject to change at a later date by the respective taxing authorities. Tax returns for each of the federal tax years since 2018 remain subject to examination by the Internal Revenue Service. As of September 30, 2022 and December 31, 2021, the cost of investments for federal income tax purposes was $776,044 and $835,502 resulting in net unrealized depreciation of $11,490 and $16,293, respectively. This is comprised of gross unrealized appreciation of $12,146 and $10,770 and gross unrealized depreciation of $23,636 and $27,062, on a tax basis, as of September 30, 2022 and December 31, 2021, respectively.
Dividends and Distributions	Dividends and Distributions The Company maintains an “opt out” dividend reinvestment plan (“DRIP”) for common stockholders. As a result, if the Company declares a distribution or other dividend, stockholders’ cash distributions will be automatically reinvested in additional shares of common stock, unless they specifically “opt out” of the DRIP so as to receive cash distributions.
Earnings per Share	Earnings per Share
Risks and Uncertainties	Risks and Uncertainties Market risk reflects changes in the value of investments due to changes in interest rates, spreads or other market factors, including the value of the collateral underlying investments held by the Company. Refer to “COVID-19 Developments” section in Note 8. Management believes that the carrying value of the Company’s investments are fairly stated, taking into consideration these risks along with estimated collateral values, payment histories and other market information.
Reclassifications	Reclassifications
Recent Accounting Pronouncements	Recent Accounting Pronouncements Fair Value Measurement of Equity Securities Subject to Contractual Sale Restrictions In March 2020, the Financial Accounting Standards Board issued ASU 2020-04, Reference Rate Reform (Topic 848) Facilitation of the Effects of Reference Rate Reform on Financial Reporting

FORWARD CURRENCY CONTRACTS (Tab

FORWARD CURRENCY CONTRACTS (Tables)	9 Months Ended
	Sep. 30, 2022
FORWARD CURRENCY CONTRACTS
Schedule of forward currency contracts	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three months ended September 30, ​ ​ Nine months ended September 30, ​ ​ ​ 2022 ​ ​ 2021 ​ 2022 ​ ​ 2021 Realized gain (loss) on forward currency contracts ​ $ — ​ $ 1 ​ $ (8) ​ $ (3) Unrealized appreciation (depreciation) on forward currency contracts ​ ​ 10 ​ ​ 187 ​ ​ 10 ​ ​ 186 Total net realized and unrealized gains (losses) on forward currency contracts ​ $ 10 ​ $ 188 ​ $ 2 ​ $ 183
Schedule of unrealized appreciation or depreciation on forward currency contracts	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Counterparty Currency to be sold Currency to be purchased Settlement date Unrealized appreciation Unrealized depreciation Morgan Stanley ​ C$ 199 CAD ​ $ 155 USD ​ 10/28/22 ​ $ 10 ​ $ — Total ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ $ 10 ​ $ —
Schedule of notional exposure to foreign currency forward contracts	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three months ended September 30, ​ Nine months ended September 30, Average USD notional outstanding ​ 2022 ​ ​ 2021 ​ 2022 ​ ​ 2021 Forward currency contracts ​ $ 125 ​ $ 13,980 ​ $ 186 ​ $ 4,754
Schedule of master netting agreement	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ As of September 30, 2022 Counterparty ($ in thousands) Derivative Assets Subject to Master Netting Agreement Derivative Liabilities Subject to Master Netting Agreement Derivatives Available for Offset Non-cash Collateral Received Non-cash Collateral Pledged (1) Cash Collateral Received (1) Cash Collateral Pledged (1) Net Amount of Derivative Assets (2) Net Amount of Derivative Liabilities (3) Morgan Stanley ​ $ 10 ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ 10 ​ $ — Total ​ $ 10 ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ 10 ​ $ —

INVESTMENTS (Tables)

INVESTMENTS (Tables)	9 Months Ended
	Sep. 30, 2022
Schedule of Investments [Line Items]
Schedule of individual investments	Investments consisted of the following: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ As of September 30, 2022 ​ As of December 31, 2021 ​ Amortized Cost Fair Value Amortized Cost Fair Value First lien secured loans ​ $ 622,517 ​ $ 615,945 ​ $ 709,318 ​ $ 697,232 Second lien secured loans ​ 24,529 ​ 20,383 ​ 25,484 ​ 23,650 Subordinated unsecured loans ​ ​ 167 ​ 167 ​ ​ 167 ​ 167 Subordinated Note to STRS JV ​ 80,000 ​ 80,000 ​ 60,000 ​ 60,000 Equity (excluding STRS JV) ​ 26,193 ​ 25,993 ​ 21,991 ​ 22,552 Equity in STRS JV ​ 20,000 ​ 22,066 ​ 15,000 ​ 15,607 Total ​ $ 773,406 ​ $ 764,554 ​ $ 831,960 ​ $ 819,208 ​ ​ The following table shows the portfolio composition by industry grouping at fair value: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Industry ($ in thousands) ​ As of September 30, 2022 ​ As of December 31, 2021 ​ Advertising $ 219 — % $ 9,738 1.3 % Air Freight & Logistics ​ ​ 16,046 ​ 2.4 ​ ​ 21,379 ​ 2.9 ​ Alternative Carriers ​ ​ 11,993 ​ 1.8 ​ ​ — ​ — ​ Application Software ​ ​ 18,145 ​ 2.7 ​ ​ 22,590 ​ 3.0 ​ Asset Management & Custody Banks ​ ​ 10,169 ​ 1.5 ​ ​ — ​ — ​ Automotive Retail ​ ​ 14,594 ​ 2.2 ​ ​ 15,286 ​ 2.1 ​ Broadcasting ​ ​ 7,942 ​ 1.2 ​ ​ 8,027 ​ 1.1 ​ Building Products ​ ​ 25,317 ​ 3.8 ​ ​ 44,184 ​ 5.9 ​ Cable & Satellite ​ ​ 14,323 ​ 2.2 ​ ​ 14,526 ​ 2.0 ​ Commodity Chemicals ​ ​ 16,003 ​ 2.4 ​ ​ 15,172 ​ 2.0 ​ Construction & Engineering ​ ​ — ​ — ​ ​ 11,086 ​ 1.5 ​ Construction Materials ​ ​ 8,168 ​ 1.2 ​ ​ 7,673 ​ 1.0 ​ Consumer Finance ​ ​ — ​ — ​ ​ 9,628 ​ 1.3 ​ Data Processing & Outsourced Services ​ ​ 43,387 ​ 6.5 ​ ​ 32,864 ​ 4.4 ​ Department Stores ​ ​ — ​ — ​ ​ 13,538 ​ 1.8 ​ Distributors ​ ​ 3,618 ​ 0.5 ​ ​ 4,025 ​ 0.5 ​ Diversified Chemicals ​ ​ 13,941 ​ 2.1 ​ ​ 18,360 ​ 2.5 ​ Diversified Support Services ​ ​ 11,309 ​ 1.7 ​ ​ 11,618 ​ 1.6 ​ Education Services ​ ​ 13,403 ​ 2.0 ​ ​ 13,398 ​ 1.8 ​ Electric Utilities ​ ​ 10,408 ​ 1.6 ​ ​ 10,296 ​ 1.4 ​ Electronic Equipment & Instruments ​ ​ — ​ — ​ ​ 6,687 ​ 0.9 ​ Environmental & Facilities Services ​ ​ 18,769 ​ 2.8 ​ ​ 32,998 ​ 4.4 ​ Health Care Facilities ​ ​ 10,318 ​ 1.6 ​ ​ 25,576 ​ 3.4 ​ Health Care Services ​ ​ 32,756 ​ 4.9 ​ ​ 58,055 ​ 7.8 ​ Health Care Supplies ​ ​ 23,354 ​ 3.5 ​ ​ — ​ — ​ Heavy Electrical Equipment ​ ​ 13,897 ​ 2.1 ​ ​ 11,088 ​ 1.5 ​ Home Furnishings ​ ​ 25,311 ​ 3.8 ​ ​ 24,017 ​ 3.2 ​ Household Appliances ​ ​ 6,003 ​ 0.9 ​ ​ — ​ — ​ Household Products ​ ​ 11,414 ​ 1.7 ​ ​ 11,773 ​ 1.6 ​ Industrial Machinery ​ ​ 8,209 ​ 1.2 ​ ​ — ​ — ​ Interactive Media & Services ​ ​ 10,260 ​ 1.5 ​ ​ 20,157 ​ 2.7 ​ Internet & Direct Marketing Retail ​ ​ 40,312 ​ 6.1 ​ ​ 45,668 ​ 6.1 ​ Investment Banking & Brokerage ​ ​ 18,372 ​ 2.8 ​ ​ 19,603 ​ 2.6 ​ IT Consulting & Other Services ​ ​ 15,471 ​ 2.3 ​ ​ 19,162 ​ 2.6 ​ Leisure Facilities ​ ​ 22,089 ​ 3.3 ​ ​ 22,142 ​ 3.0 ​ Leisure Products ​ ​ 5,608 ​ 0.9 ​ ​ 3,072 ​ 0.4 ​ Life Sciences Tools & Services ​ ​ 4,912 ​ 0.8 ​ ​ 4,925 ​ 0.7 ​ Office Services & Supplies ​ ​ 25,039 ​ 3.8 ​ ​ 20,921 ​ 2.8 ​ Other Diversified Financial Services ​ ​ 3,823 ​ 0.7 ​ ​ 3,492 ​ 0.5 ​ Packaged Foods & Meats ​ ​ 10,922 ​ 1.6 ​ ​ 10,862 ​ 1.5 ​ Paper Packaging ​ ​ 8,499 ​ 1.4 ​ ​ — ​ — ​ Personal Products ​ ​ 13,566 ​ 2.1 ​ ​ 12,260 ​ 1.6 ​ Real Estate Operating Companies ​ ​ — ​ — ​ ​ 5,431 ​ 0.7 ​ Research & Consulting Services ​ ​ 22,316 ​ 3.4 ​ ​ 23,822 ​ 3.2 ​ Specialized Consumer Services ​ ​ 37,949 ​ 5.7 ​ ​ 36,225 ​ 4.9 ​ Specialized Finance (1) ​ ​ — ​ — ​ ​ — ​ — ​ Systems Software ​ ​ 17,525 ​ 2.7 ​ ​ 19,160 ​ 2.6 ​ Technology Hardware, Storage & Peripherals ​ ​ 16,809 ​ 2.6 ​ ​ 23,117 ​ 3.1 ​ Total (1) ​ $ 662,488 ​ 100.0 % $ 743,601 ​ 100.0 % (1) Excludes investments in STRS JV.
Schedule of forward currency contracts	Forward Currency Contracts ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Counterparty Currency to be sold ​ Currency to be purchased ​ Settlement date Unrealized appreciation Unrealized depreciation Morgan Stanley ​ C$ 348 CAD ​ $ 270 USD ​ 10/28/22 ​ $ 18 ​ $ — Morgan Stanley ​ £ 282 GBP ​ $ 340 USD ​ 10/28/22 ​ ​ 25 ​ ​ — Morgan Stanley ​ € 1,383 EUR ​ $ 1,394 USD ​ 10/28/22 ​ ​ 36 ​ ​ — Total ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ $ 79 ​ $ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Counterparty Currency to be sold Currency to be purchased Settlement date Unrealized appreciation Unrealized depreciation Morgan Stanley ​ C$ 856 CAD ​ $ 692 USD ​ 1/27/2022 ​ $ 15 ​ $ — Morgan Stanley ​ £ 175 GBP ​ $ 241 USD ​ 1/27/2022 ​ ​ 4 ​ ​ — Total ​ ​ ​ ​ ​ ​ ​ ​ ​ $ 19 ​ $ —
Schedule of selected Balance Sheet Information	​ ​ ​ ​ ​ ​ ​ ​ Selected Balance Sheet Information ($ in thousands) ​ As of September 30, 2022 ​ As of December 31, 2021 Assets ​ ​ Investments, at fair value (amortized cost of $285,614 and $260,472, respectively) ​ $ 280,877 ​ $ 259,510 Cash and cash equivalents ​ 23,715 ​ 13,004 Interest receivable ​ ​ 1,433 ​ ​ 735 Unrealized appreciation on foreign currency forward contracts ​ ​ 79 ​ ​ 19 Other assets ​ 288 ​ 255 Total assets ​ $ 306,392 ​ $ 273,523 Liabilities ​ ​ Credit facility ​ $ 149,322 ​ $ 145,003 Note payable to members ​ 120,000 ​ 100,000 Interest payable on credit facility ​ 576 ​ 282 Interest payable on notes to members ​ 2,630 ​ 1,575 Other liabilities ​ 764 ​ 651 Total liabilities ​ 273,292 ​ 247,511 Members’ equity ​ 33,100 ​ 26,012 Total liabilities and members’ equity ​ $ 306,392 ​ $ 273,523
Schedule of selected Statement of Operations Information	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended ​ Nine Months Ended Selected Statement of Operations Information ($ in thousands) September 30, 2022 September 30, 2021 September 30, 2022 September 30, 2021 Interest income ​ $ 7,858 ​ $ 4,972 ​ $ 20,985 ​ $ 13,554 Total investment income ​ $ 7,858 ​ $ 4,972 ​ $ 20,985 ​ $ 13,554 Interest expense on credit facility ​ 2,034 ​ 1,079 ​ 4,919 ​ 3,037 Interest expense on notes to members ​ 2,630 ​ 1,511 ​ 6,611 ​ 3,937 Administrative fee ​ 161 ​ 117 ​ 475 ​ 312 Other expenses ​ 128 ​ 150 ​ 513 ​ 379 Total expenses ​ $ 4,953 ​ $ 2,857 ​ $ 12,518 ​ $ 7,665 Net investment income ​ 2,905 ​ 2,115 ​ 8,467 ​ 5,889 Net realized gains (losses) on investments and foreign currency transactions ​ 130 ​ 8 ​ 250 ​ (51) Net change in unrealized appreciation (depreciation) on investments and foreign currency transactions ​ (286) ​ 874 ​ 1,306 ​ 1,209 Net increase in members’ equity resulting from operations ​ $ 2,749 ​ $ 2,997 ​ $ 10,023 ​ $ 7,047
STRS JV
Schedule of Investments [Line Items]
Schedule of individual investments	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Dividends and ​ Beginning ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Net Change in ​ Ending Fair ​ ​ ​ ​ interest ​ Fair Value at ​ ​ ​ ​ ​ ​ ​ Net ​ Unrealized ​ Value at ​ ​ Type of ​ included in ​ December 31, ​ ​ ​ ​ ​ ​ ​ Realized ​ Appreciation ​ September 30, Affiliated Person (1) ​ Asset income 2021 Purchases Sales Gain (Loss) (Depreciation) 2022 Non-controlled affiliates ​ ​ ​ ​ ​ ​ ​ ​ Arcole Holding Corporation ​ Equity ​ $ 261 ​ $ 6,874 ​ $ — ​ $ — ​ $ — ​ $ (579) ​ $ 6,295 PlayMonster LLC ​ First Lien Secured Revolving Loan ​ 13 ​ — ​ 1,088 ​ (1,088) ​ — ​ — ​ — Playmonster Group LLC ​ First Lien Secured Loan ​ 215 ​ — ​ 3,565 ​ — ​ — ​ (56) ​ 3,509 Playmonster Group Equity, Inc. (d/b/a PlayMonster) ​ Preferred Equity ​ — ​ — ​ 3,600 ​ — ​ — ​ (1,501) ​ 2,099 Playmonster Group Equity, Inc. (d/b/a PlayMonster) ​ Common Equity ​ — ​ — ​ 460 ​ — ​ — ​ (460) ​ — Total Non-controlled affiliates ​ ​ ​ $ 489 ​ $ 6,874 ​ $ 8,713 ​ $ (1,088) ​ $ — ​ $ (2,596) ​ $ 11,903 Controlled affiliates ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ WHF STRS Ohio Senior Loan Fund LLC* Subordinated Note ​ $ 4,339 ​ $ 60,000 ​ $ 20,000 ​ $ — ​ $ — ​ $ — ​ $ 80,000 WHF STRS Ohio Senior Loan Fund LLC* Equity ​ 5,042 ​ 15,607 ​ 5,000 ​ — ​ — ​ 1,459 ​ 22,066 Total Controlled affiliates ​ $ 9,381 ​ $ 75,607 ​ $ 25,000 ​ $ — ​ $ — ​ $ 1,459 ​ $ 102,066 * The Company and STRS Ohio are the members of STRS JV, a joint venture formed as a Delaware limited liability company that is not consolidated by either member for financial reporting purposes. The members make investments in STRS JV in the form of limited liability company (“LLC”) equity interests and interest-bearing subordinated notes as STRS JV makes investments, and all portfolio and other material decisions regarding STRS JV must be submitted to STRS JV’s board of managers which is comprised of an equal number of members appointed by each of the Company and STRS Ohio. Because management of STRS JV is shared equally between the Company and STRS Ohio, the Company does not believe it controls STRS JV for purposes of the 1940 Act or otherwise. (1) Refer to the consolidated schedule of investments for the principal amount, industry classification and other security detail of each portfolio company. The following table presents the schedule of investments in and advances to affiliated and controlled persons (as defined by the 1940 Act) as of and for the year ended December 31, 2021: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Dividends and ​ Beginning Fair ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Net Change in ​ Ending Fair ​ ​ ​ ​ interest ​ Value at ​ ​ ​ ​ ​ ​ ​ Net ​ Unrealized ​ Value at ​ ​ Type of ​ included in ​ December 31, ​ ​ ​ ​ ​ ​ ​ Realized ​ Appreciation ​ December 31, Affiliated Person (1) Asset income 2020 Purchases Sales Gain (Loss) (Depreciation) 2021 Non-controlled affiliates ​ ​ ​ ​ ​ ​ ​ ​ Arcole Holding Corporation ​ Equity ​ $ 897 ​ $ 6,448 ​ $ — ​ $ — ​ $ — ​ $ 426 ​ $ 6,874 NMFC Senior Loan Program I LLC Units ​ Equity ​ 293 ​ 9,269 ​ — ​ (10,000) ​ — ​ 761 ​ — Total Non-controlled affiliates ​ ​ ​ $ 1,190 ​ $ 15,717 ​ $ — ​ $ (10,000) ​ $ — ​ $ 1,187 ​ $ 6,874 Controlled affiliates ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ WHF STRS Ohio Senior Loan Fund LLC* Subordinated Note ​ $ 3,307 ​ $ 41,073 ​ $ 18,927 ​ $ — ​ $ — ​ $ — ​ $ 60,000 WHF STRS Ohio Senior Loan Fund LLC* Equity ​ 4,907 ​ 10,167 ​ 4,732 ​ — ​ — ​ 708 ​ 15,607 Total Controlled affiliates ​ $ 8,214 ​ $ 51,240 ​ $ 23,659 ​ $ — ​ $ — ​ $ 708 ​ $ 75,607 * The Company and STRS Ohio are the members of STRS JV, a joint venture formed as a Delaware LLC that is not consolidated by either member for financial reporting purposes. The members make investments in STRS JV in the form of LLC equity interests and interest-bearing subordinated notes as STRS JV makes investments, and all portfolio and other material decisions regarding STRS JV must be submitted to STRS JV’s board of managers which is comprised of an equal number of members appointed by each of the Company and STRS Ohio. Because management of STRS JV is shared equally between the Company and STRS Ohio, the Company does not believe it controls STRS JV for purposes of the 1940 Act or otherwise. (1) Refer to the consolidated schedule of investments for the principal amount, industry classification and other security detail of each portfolio company.

FAIR VALUE MEASUREMENTS (Tables

FAIR VALUE MEASUREMENTS (Tables)	9 Months Ended
	Sep. 30, 2022
FAIR VALUE MEASUREMENTS
Schedule of investments measured at fair value	The following table presents investments (as shown on the consolidated schedule of investments) that were measured at fair value as of September 30, 2022: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Level 1 Level 2 Level 3 Total First lien secured loans ​ $ — ​ $ — ​ $ 615,945 ​ $ 615,945 Second lien secured loans ​ — ​ — ​ 20,383 ​ 20,383 Subordinated unsecured loans ​ ​ — ​ — ​ 167 ​ 167 Subordinated Note to STRS JV ​ — ​ — ​ 80,000 ​ 80,000 Equity (excluding STRS JV) ​ — ​ — ​ 25,993 ​ 25,993 Equity in STRS JV (1) ​ — ​ — ​ — ​ 22,066 Total investments ​ $ — ​ $ — ​ $ 742,488 ​ $ 764,554 (1) The Company’s equity investment in STRS JV is measured using the net asset value per share as a practical expedient for fair value, and thus has not been classified in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the consolidated statements of assets and liabilities. The following table presents investments (as shown on the consolidated schedule of investments) that were measured at fair value as of December 31, 2021: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Level 1 Level 2 Level 3 ​ Total First lien secured loans ​ $ — ​ $ — ​ $ 697,232 ​ $ 697,232 Second lien secured loans ​ — ​ — ​ 23,650 ​ 23,650 Subordinated Note to STRS JV ​ ​ — ​ — ​ 167 ​ 167 Subordinated Note to STRS JV ​ — ​ — ​ 60,000 ​ ​ 60,000 Equity (excluding STRS JV) ​ — ​ — ​ 22,552 ​ 22,552 Equity in STRS JV (1) ​ — ​ — ​ — ​ 15,607 Total investments ​ $ — ​ $ — ​ $ 803,601 ​ $ 819,208 (1) The Company’s equity investment in STRS JV is measured using the net asset value per share as a practical expedient for fair value, and thus has not been classified in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the consolidated statements of assets and liabilities.
Schedule of changes in investments measured at fair value using Level 3 inputs	The following table presents the changes in investments measured at fair value using Level 3 inputs for the three and nine months ended September 30, 2022: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ First Lien Second Lien ​ Subordinated ​ ​ ​ ​ ​ ​ Secured ​ Secured ​ Subordinated ​ Notes to STRS ​ ​ ​ ​ Total Three months ended September 30, 2022 ​ Loans ​ Loans ​ Notes ​ JV ​ Equity ​ Investments Fair value, beginning of period ​ $ 614,859 ​ $ 22,063 $ 167 ​ $ 80,000 ​ $ 27,111 ​ $ 744,200 Funding of investments ​ 52,893 ​ — ​ — ​ — ​ 408 ​ 53,301 Non-cash interest income ​ 594 ​ 3 ​ — ​ — ​ — ​ 597 Accretion of discount ​ 1,039 ​ 21 ​ — ​ — ​ — ​ 1,060 Proceeds from paydowns and sales ​ (48,549) ​ — ​ — ​ — ​ (1,011) ​ (49,560) Conversions ​ — ​ — ​ — ​ — ​ — ​ — Realized gains (losses) ​ 45 ​ — ​ — ​ — ​ 154 ​ 199 Net unrealized (depreciation) appreciation ​ (4,936) ​ (1,704) ​ — ​ — ​ (669) ​ (7,309) Fair value, end of period ​ $ 615,945 ​ $ 20,383 $ 167 ​ $ 80,000 ​ $ 25,993 ​ $ 742,488 Change in unrealized appreciation (depreciation) on investments still held as of September 30, 2022 ​ $ (4,689) ​ $ (1,702) ​ $ — ​ $ — ​ $ (384) ​ $ (6,775) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ First Lien Second Lien ​ Subordinated ​ ​ ​ ​ ​ ​ Secured ​ Secured ​ Subordinated ​ Notes to STRS ​ ​ ​ ​ Total Nine months ended September 30, 2022 ​ Loans ​ Loans ​ Notes ​ JV ​ Equity ​ Investments Fair value, beginning of period ​ $ 697,232 ​ $ 23,650 $ 167 ​ $ 60,000 ​ $ 22,552 ​ $ 803,601 Funding of investments ​ 222,667 ​ — ​ — ​ 20,000 ​ 1,085 ​ 243,752 Non-cash interest income ​ 1,548 ​ 5 ​ — ​ — ​ — ​ 1,553 Accretion of discount (premium) ​ 3,972 ​ 64 ​ — ​ — ​ — ​ 4,036 Proceeds from paydowns and sales ​ (293,935) ​ — ​ — ​ — ​ (2,862) ​ (296,797) Conversions ​ (4,060) ​ — ​ — ​ — ​ 4,060 ​ — Realized gains (losses) ​ (16,994) ​ (1,024) ​ — ​ — ​ 1,919 ​ (16,099) Net unrealized (depreciation) appreciation ​ 5,515 ​ (2,312) ​ — ​ — ​ (761) ​ 2,442 Fair value, end of period ​ $ 615,945 ​ $ 20,383 $ 167 ​ $ 80,000 ​ $ 25,993 ​ $ 742,488 Change in unrealized appreciation (depreciation) on investments still held as of September 30, 2022 ​ $ (6,691) ​ $ (3,336) ​ $ — ​ $ — ​ $ (600) ​ $ (10,627) ​ ​ The following table presents the changes in investments measured at fair value using Level 3 inputs for the three and nine months ended September 30, 2021: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ First Lien Second Lien ​ ​ Subordinated ​ ​ ​ ​ ​ ​ Secured ​ Secured ​ Subordinated ​ Notes to STRS ​ ​ ​ ​ Total Three months ended September 30, 2021 ​ Loans ​ Loans ​ Notes ​ JV ​ Equity ​ Investments Fair value, beginning of period ​ $ 562,837 ​ $ 29,714 $ — ​ $ 49,809 ​ $ 16,033 ​ $ 658,393 Funding of investments ​ 135,497 ​ — ​ 167 ​ 7,488 ​ 2,278 ​ 145,430 Non-cash interest income ​ 173 ​ 1 ​ — ​ — ​ — ​ 174 Accretion of discount ​ 2,115 ​ 29 ​ — ​ — ​ — ​ 2,144 Proceeds from paydowns and sales ​ (133,361) ​ — ​ — ​ — ​ — ​ (133,361) Realized gains ​ 120 ​ — ​ — ​ — ​ (11) ​ 109 Net unrealized (depreciation) appreciation ​ (2,385) ​ (82) ​ — ​ — ​ 1,888 ​ (579) Fair value, end of period ​ $ 564,996 ​ $ 29,662 ​ $ 167 ​ $ 57,297 ​ $ 20,188 ​ $ 672,310 Change in unrealized appreciation (depreciation) on investments still held as of September 30, 2021 ​ $ 216 ​ $ 112 ​ $ — ​ $ — ​ $ 2,931 ​ $ 3,259 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ First Lien Second Lien ​ ​ Subordinated ​ ​ ​ ​ ​ ​ Secured ​ Secured ​ Subordinated ​ Notes to STRS ​ ​ ​ ​ Total Nine months ended September 30, 2021 ​ Loans ​ Loans ​ Notes ​ JV ​ Equity ​ Investments Fair value, beginning of period ​ $ 588,580 ​ $ 27,596 $ — ​ $ 41,073 ​ $ 23,319 ​ $ 680,568 Funding of investments ​ 310,749 ​ 14,550 ​ 498 ​ 16,224 ​ 2,938 ​ 344,959 Non-cash interest income ​ 857 ​ 3 ​ — ​ — ​ — ​ 860 Accretion of discount ​ 5,549 ​ 125 ​ — ​ — ​ (25) ​ 5,649 Proceeds from paydowns and sales ​ (341,177) ​ (12,670) ​ (331) ​ — ​ (9,442) ​ (363,620) Realized losses ​ 8,288 ​ — ​ — ​ — ​ (574) ​ 7,714 Net unrealized (depreciation) appreciation ​ (7,850) ​ 58 ​ — ​ — ​ 3,972 ​ (3,820) Fair value, end of period ​ $ 564,996 ​ $ 29,662 ​ $ 167 ​ $ 57,297 ​ $ 20,188 ​ $ 672,310 Change in unrealized appreciation (depreciation) on investments still held as of September 30, 2021 ​ $ 1,516 ​ $ 113 ​ $ — ​ $ — ​ $ 3,211 ​ $ 4,840
Schedule of Quantitative information about Level 3 fair value measurements	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Fair Value as of ​ Valuation ​ Unobservable ​ Range Investment Type ​ September 30, 2022 ​ Techniques ​ Inputs ​ (Weighted Average) (1) First lien secured loans ​ $ 406,569 ​ Discounted cash flows ​ Discount rate ​ 7.5% – 19.9% (12.4%) ​ ​ ​ 37,014 ​ Recent transaction ​ Transaction price ​ 82.0 – 99.1 (91.8) ​ ​ ​ 111,055 ​ Discounted cash flows and Recent transaction ​ Discount rate ​ 7.6% – 13.5% (12.6%) ​ ​ ​ ​ ​ ​ ​ Transaction price ​ 92.4 – 100.0 (97.9) ​ ​ ​ 30,790 ​ Discounted cash flows and Market quote ​ Discount Rate ​ 10.5% – 11.8% (11.4%) ​ ​ ​ ​ ​ ​ ​ Market Quote ​ 85.2 – 95.1 (90.7) ​ ​ ​ 30,517 ​ Expected repayment ​ Transaction price ​ 100.0 ​ ​ $ 615,945 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Second lien secured loans ​ $ 3,274 ​ Discounted cash flows ​ Discount rate ​ 17.4% ​ ​ ​ 4,912 ​ Discounted cash flows and Recent transaction ​ Transaction price ​ 98.6 ​ ​ ​ ​ ​ ​ ​ Discount rate ​ 12.2% ​ ​ ​ 12,197 ​ Discounted cash flows and Market quote ​ Discount Rate ​ 18.2% ​ ​ ​ ​ ​ ​ ​ Market Quote ​ 77.8 ​ ​ $ 20,383 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Subordinated Notes ​ $ 80,000 ​ Enterprise value ​ – ​ – ​ ​ ​ 167 ​ Discounted cash flows ​ Discount Rate ​ 4.1% ​ ​ $ 80,167 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Preferred Equity ​ $ 2,217 ​ Discounted cash flows ​ Discount rate ​ 24.3% – 25.5% (24.4%) ​ ​ ​ ​ ​ ​ ​ EBITDA Multiple ​ 9.0x ​ ​ ​ 816 ​ Discounted cash flows and Enterprise value ​ Discount Rate ​ 17.0% ​ ​ ​ ​ ​ ​ ​ EBITDA Multiple ​ 3.6x - 8.5x (6.1x) ​ ​ ​ ​ ​ ​ ​ Discount for lack of marketability ​ 15.0% ​ ​ ​ 853 ​ Enterprise value ​ Discount Rate ​ 11.7% ​ ​ $ 3,886 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Common Equity ​ $ 1,614 ​ Discounted cash flows ​ Discount rate ​ 19.3% – 21.3% (21.1%) ​ ​ ​ ​ ​ ​ ​ EBITDA Multiple ​ 7.5x ​ ​ ​ 9,523 ​ Discounted cash flows and Enterprise value ​ Discount Rate ​ 12.0% – 19.4% (18.1%) ​ ​ ​ ​ ​ ​ ​ EBITDA Multiple ​ 4.8 - 12.1 (9.3x) ​ ​ ​ 361 ​ Enterprise value ​ EBITDA Multiple ​ 13.3x - 17.1x (15.2x) ​ ​ ​ ​ ​ ​ ​ Discount for lack of marketability ​ 10.0% ​ ​ ​ 219 ​ Collateral value and Recent transaction ​ Transaction price ​ $1.30 per share ​ ​ ​ ​ ​ ​ ​ EBITDA Multiple ​ 8.0x ​ ​ ​ ​ ​ ​ ​ Discount for lack of marketability ​ 15.0% ​ ​ ​ 2,471 ​ Collateral value ​ EBITDA Multiple ​ 6.0x – 10.0x (8.0x) ​ ​ ​ ​ ​ ​ ​ Discount for lack of marketability ​ 15.0% ​ ​ ​ 400 ​ Recent transaction ​ Transaction price ​ $1.00 per share ​ ​ ​ 1,264 ​ Recent transaction and Enterprise value ​ Transaction price ​ $10.0 - 1,000.0 (482.4 per share) ​ ​ ​ ​ ​ ​ ​ EBITDA Multiple ​ 5.0x – 12.3x (8.8x) ​ ​ ​ ​ ​ ​ ​ Discount for lack of marketability ​ 15.0% ​ ​ $ 15,852 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Warrant ​ ​ 3,823 ​ Discounted cash flows and Option-pricing method ​ Discount rate ​ 19.3% ​ ​ ​ ​ ​ ​ ​ EBITDA multiple ​ 10.2x ​ ​ ​ ​ ​ ​ ​ Discount for lack of marketability ​ 15.0% ​ ​ ​ 2,432 ​ Discounted cash flows ​ Discount Rate ​ 0.5% ​ ​ ​ ​ ​ ​ ​ EBITDA Multiple ​ 0.3x ​ ​ ​ ​ ​ ​ ​ Volatility ​ 0.0% ​ ​ ​ ​ ​ ​ ​ Discount for lack of marketability ​ 0.4% ​ ​ $ 6,255 ​ ​ ​ ​ ​ ​ Total Level 3 Investments ​ $ 742,488 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ (1) Unobservable inputs were weighted by the relative fair value of the investments. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Fair Value as of ​ Valuation ​ Unobservable ​ Range Investment Type ​ December 31, 2021 ​ Techniques ​ Inputs ​ (Weighted Average) (1) First lien secured loans ​ $ 358,921 ​ Discounted cash flows ​ Discount rate ​ 4.5% – 21.8% (9.8%) ​ ​ ​ ​ ​ ​ ​ Exit EBITDA multiple ​ 5.5x – 15.0x (8.3x) ​ ​ ​ 209,892 ​ Recent transaction ​ Transaction price ​ 94.5 – 99.1 (97.9) ​ ​ ​ 113,808 ​ Discounted cash flows and Recent transaction ​ Discount rate ​ 7.2% – 10.3% (8.6%) ​ ​ ​ ​ ​ ​ ​ Transaction price ​ 97.5 – 98.8 (98.4) ​ ​ ​ ​ ​ ​ ​ Exit EBITDA multiple ​ 7.0x – 11.0x (9.5x) ​ ​ ​ 7,542 ​ Guideline public companies ​ LTM EBITDA multiple ​ 5.1x ​ ​ ​ 7,069 ​ Expected repayment ​ - ​ - ​ ​ $ 697,232 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Second lien secured loans ​ $ 18,725 ​ Discounted cash flows ​ Discount rate ​ 11.5% – 22.3% (14.2%) ​ ​ ​ ​ ​ ​ ​ Exit EBITDA multiple ​ 6.5x – 8.5x (8.0x) ​ ​ ​ 4,925 ​ Recent transaction ​ Transaction price ​ 98.5 ​ ​ $ 23,650 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Subordinated Notes ​ $ 60,000 ​ Enterprise value ​ - ​ - ​ ​ ​ 167 ​ Recent transaction ​ Transaction price ​ 100.0 ​ ​ $ 60,167 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Preferred Equity ​ $ 1,018 ​ Similar transactions ​ LTM EBITDA multiple ​ 9.7x ​ ​ ​ ​ ​ ​ ​ Discount for lack of marketability ​ 15.0% ​ ​ ​ 786 ​ Discounted cash flows and Guideline public companies ​ Discount Rate ​ 17.3% ​ ​ ​ ​ ​ ​ ​ Exit EBITDA Multiple ​ 11.0x ​ ​ ​ ​ ​ ​ ​ LTM EBITDA Multiple ​ 7.9x ​ ​ ​ ​ ​ ​ ​ NFY EBITDA Multiple ​ 7.5x ​ ​ ​ ​ ​ ​ ​ Discount for lack of marketability ​ 10.0% ​ ​ ​ 1,007 ​ Recent transaction ​ Transaction price ​ $1.00 – $56.30 ($47.13) per share ​ ​ $ 2,811 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Common Equity ​ $ 3,602 ​ Discounted cash flows ​ Discount rate ​ 13.0% – 22.7% (15.0%) ​ ​ ​ ​ ​ ​ ​ Exit EBITDA Multiple ​ 8.6x – 10.0x (9.6x) ​ ​ ​ ​ ​ ​ ​ Discount for lack of marketability ​ 10.0% – 15.0% (10.3%) ​ ​ ​ 8,124 ​ Discounted cash flows, Guideline public companies and Expected repayment ​ Discount rate ​ 14.0% – 19.0% (18.2%) ​ ​ ​ ​ ​ ​ ​ Exit EBITDA Multiple ​ 8.0x – 11.0x (10.5x) ​ ​ ​ ​ ​ ​ ​ NFY EBITDA Multiple ​ 8.6x – 10.8x (8.9x) ​ ​ ​ ​ ​ ​ ​ Discount for lack of marketability ​ 10.0% ​ ​ ​ ​ ​ ​ ​ Transaction price ​ $1.00 per share ​ ​ ​ 2,052 ​ Similar transactions ​ LTM EBITDA Multiple ​ 6.0x – 13.4x (10.5x) ​ ​ ​ 1,502 ​ Recent transaction ​ Transaction price ​ $1.00 – $1,000.00 ($289.95) per share ​ ​ $ 15,280 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Warrant ​ ​ 4,461 ​ Discounted cash flows and Option-pricing method ​ Discount rate ​ 22.7% – 29.5% (29.2%) ​ ​ ​ ​ ​ ​ ​ Exit EBITDA multiple ​ 5.5x – 8.6x (5.9x) ​ ​ ​ ​ ​ ​ ​ Volatility ​ 3.5% – 8.7% (3.6%) ​ ​ ​ ​ ​ ​ ​ Discount for lack of marketability ​ 15.0% ​ ​ $ 4,461 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total Level 3 Investments ​ $ 803,601 ​ ​ ​ ​ ​ ​ (1) Unobservable inputs were weighted by the relative fair value of the investments.
Schedule of principal amount and fair value of the Company's borrowings	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ As of September 30, 2022 ​ As of December 31, 2021 ​ ​ Fair ​ Principal Amount ​ ​ ​ ​ Principal Amount ​ ​ ​ ​ Value Level Outstanding Fair Value Outstanding Fair Value JPM Credit Facility 3 ​ $ 246,101 ​ $ 243,552 ​ $ 291,637 ​ $ 302,147 6.000% 2023 Notes 3 ​ 30,000 ​ 29,860 ​ 30,000 ​ 31,802 5.375% 2025 Notes 3 ​ 40,000 ​ 37,355 ​ 40,000 ​ 40,687 5.375% 2026 Notes ​ 3 ​ ​ 10,000 ​ ​ 9,089 ​ ​ 10,000 ​ ​ 10,091 4.000% 2026 Notes 3 ​ 75,000 ​ 67,132 ​ 75,000 ​ 74,957 5.625% 2027 Notes 3 ​ 10,000 ​ 8,983 ​ 10,000 ​ 10,097 4.250% 2028 Notes ​ 3 ​ ​ 25,000 ​ 21,642 ​ ​ 25,000 ​ 24,861 ​ ​ ​ ​ $ 436,101 ​ $ 417,613 ​ $ 481,637 ​ $ 494,642

BORROWINGS (Tables)

BORROWINGS (Tables)	9 Months Ended
	Sep. 30, 2022
BORROWINGS
Schedule of borrowings outstanding and available	Total borrowings outstanding and available as of September 30, 2022, were as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Maturity Rate Principal Amount Outstanding Amortized Cost Available JPM Credit Facility 11/22/2025 L+2.35 % $ 246,101 ​ $ 243,552 ​ $ 88,899 6.000% 2023 Notes 8/7/2023 6.00 % 30,000 ​ 29,849 ​ — 5.375% 2025 Notes 10/20/2025 5.375 % 40,000 ​ 39,596 ​ — 5.375% 2026 Notes 12/4/2026 5.375 % 10,000 ​ 9,878 ​ — 4.000% 2026 Notes 12/15/2026 4.00 % 75,000 ​ 73,567 ​ — 5.625% 2027 Notes 12/4/2027 5.625 % 10,000 ​ 9,870 ​ — 4.250% 2028 Notes ​ 12/6/2028 ​ 4.25 % ​ 25,000 ​ ​ 24,680 ​ ​ — Total debt ​ ​ ​ ​ $ 436,101 ​ $ 430,992 ​ $ 88,899 ​ Total borrowings outstanding and available as of December 31, 2021, were as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Maturity Rate Principal Amount Outstanding Amortized Cost Available JPM Credit Facility 11/22/2025 L+2.35 % $ 291,637 ​ $ 288,985 ​ $ 43,363 6.000% 2023 Notes 8/7/2023 6.00 % 30,000 ​ 29,717 ​ — 5.375% 2025 Notes 10/20/2025 5.375 % 40,000 ​ 39,497 ​ — 5.375% 2026 Notes 12/4/2026 5.375 % 10,000 ​ 9,856 ​ — 4.000% 2026 Notes 12/15/2026 4.00 % 75,000 ​ 73,404 ​ — 5.625% 2027 Notes 12/4/2027 5.625 % 10,000 ​ 9,851 ​ — 4.250% 2028 Notes ​ 12/6/2028 ​ 4.25 % ​ 25,000 ​ ​ 24,648 ​ ​ — Total debt ​ ​ ​ ​ $ 481,637 ​ $ 475,958 ​ $ 43,363

RELATED PARTY TRANSACTIONS (Tab

RELATED PARTY TRANSACTIONS (Tables)	9 Months Ended
	Sep. 30, 2022
RELATED PARTY TRANSACTIONS
Schedule of management fee expenses	The following table details our management fee expenses for the three and nine months ended September 30, 2022 and 2021: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three months ended September 30, ​ ​ Nine months ended September 30, Management Fee ($ in thousands) ​ 2022 ​ ​ 2021 ​ 2022 ​ ​ 2021 Base management fee ​ $ 3,881 ​ $ 3,508 ​ $ 11,741 ​ $ 10,209 Base management fee waived ​ ​ — ​ ​ — ​ ​ — ​ ​ — Total management fees ​ $ 3,881 ​ $ 3,508 ​ $ 11,741 ​ $ 10,209
Schedule of performance-based incentive fees	The following table provides a breakdown of the performance-based incentive fees for the three and nine months ended September 30, 2022 and 2021: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three months ended September 30, ​ ​ Nine months ended September 30, Performance-based Incentive Fee ($ in thousands) ​ 2022 ​ ​ 2021 ​ 2022 ​ ​ 2021 Income incentive fee ​ $ 2,159 ​ $ 1,942 ​ $ 6,094 ​ $ 5,616 Capital gains incentive fee ​ ​ (1,132) ​ ​ 127 ​ ​ (1,803) ​ ​ 1,123 Performance-based incentive fees waived ​ ​ — ​ ​ — ​ ​ — ​ ​ — Total performance-based incentive fees ​ $ 1,027 ​ $ 2,069 ​ $ 4,291 ​ $ 6,739

COMMITMENTS AND CONTINGENCIES (

COMMITMENTS AND CONTINGENCIES (Tables)	9 Months Ended
	Sep. 30, 2022
COMMITMENTS AND CONTINGENCIES
Schedule of unfunded commitments	​ ​ ​ ​ ​ ​ ​ ​ Unfunded Commitments (1) ($ in thousands) As of September 30, 2022 As of December 31, 2021 Revolving Loan Commitments: ​ ​ ​ ​ ​ ​ ABB/Con-cise Optical Group LLC (d/b/a ABB Optical Group, LLC) ​ $ 158 ​ $ — Bridgepoint Healthcare, LLC ​ ​ 1,588 ​ ​ 1,588 Camp Facility Services Holdings, LLC (d/b/a Camp Construction Services, Inc.) ​ ​ — ​ ​ 2,031 Claridge Products and Equipment, LLC ​ ​ 56 ​ ​ 491 Coastal Television Broadcasting Group LLC ​ ​ 309 ​ ​ 309 EducationDynamics, LLC ​ ​ 960 ​ ​ 1,199 Epiphany Business Services, LLC (d/b/a Epiphany Dermatology, PA) ​ ​ — ​ ​ 438 I&I Sales Group, LLC (d/b/a Avision Sales Group) ​ ​ — ​ ​ 619 HC Salon Holdings, Inc. (d/b/a Hair Cuttery) ​ ​ 700 ​ ​ 700 HRG Management, LLC (d/b/a HomeRiver Group, LLC) ​ ​ — ​ ​ 1,083 Industrial Specialty Services USA LLC ​ ​ 295 ​ ​ 1,182 Inspired Beauty Brands, Inc. ​ ​ 531 ​ ​ 531 ITS Buyer Inc. (d/b/a ITS Logistics, LLC) ​ ​ — ​ ​ 592 IvyRehab Intermediate II, LLC (d/b/a Ivy Rehab) ​ ​ — ​ ​ 403 Juniper Landscaping Holdings LLC ​ ​ — ​ ​ 597 LHS Borrower, LLC (d/b/a Leaf Home, LLC) ​ ​ — ​ ​ 560 LMG Holdings, Inc. ​ ​ — ​ ​ 414 Max Solutions Inc. (1) ​ ​ 161 ​ ​ — Max Solutions Inc. ​ ​ 1,212 ​ ​ — Motivational Marketing, LLC (d/b/a Motivational Fulfillment) ​ ​ 1,182 ​ ​ 1,182 MSI Information Services, Inc. ​ ​ 750 ​ ​ — Naviga Inc. (f/k/a Newscycle Solutions, Inc.) ​ ​ 34 ​ ​ 132 PFB Holdco, Inc. (d/b/a PFB Corporation) (1) ​ ​ 882 ​ ​ 963 PFB Holdco, Inc. (d/b/a PFB Corporation) ​ ​ 296 ​ ​ 296 PG Dental New Jersey Parent, LLC ​ ​ 352 ​ ​ 232 Power Service Group CR Acquisition Inc. (d/b/a Power Plant Services) ​ ​ 3,030 ​ ​ 3,030 RLJ Pro-Vac, Inc. (d/b/a Pro-Vac) ​ ​ — ​ ​ 1,013 Sleep OpCo LLC (d/b/a Brooklyn Bedding LLC) ​ ​ 2,646 ​ ​ 2,646 Telestream Holdings Corporation ​ ​ 397 ​ ​ 795 The Kyjen Company, LLC (d/b/a Outward Hound) ​ ​ 262 ​ ​ 554 Trimlite Buyer LLC (d/b/a Trimlite LLC) ​ ​ — ​ ​ 1,473 Total unfunded revolving loan commitments ​ ​ 15,801 ​ ​ 25,053 ​ ​ ​ ​ ​ ​ ​ Delayed Draw Loan Commitments: ​ ​ ​ ​ ​ ​ BBQ Buyer, LLC (d/b/a BBQ Guys) ​ ​ — ​ ​ 854 Bridgepoint Healthcare, LLC ​ ​ 794 ​ ​ 794 Camp Facility Services Holdings, LLC (d/b/a Camp Construction Services, Inc.) ​ ​ 4,063 ​ ​ 4,063 DCA Investment Holding, LLC (d/b/a Dental Care Alliance, LLC) ​ ​ — ​ ​ 1,062 EducationDynamics, LLC ​ ​ 1,709 ​ ​ 1,709 Empire Office, Inc. ​ ​ — ​ ​ 4,926 Grupo HIMA San Pablo, Inc. ​ ​ — ​ ​ 667 HRG Management, LLC (d/b/a HomeRiver Group, LLC) ​ ​ — ​ ​ 1,514 I&I Sales Group, LLC (d/b/a Avision Sales Group) ​ ​ — ​ ​ 2,699 IvyRehab Intermediate II, LLC (d/b/a Ivy Rehab) ​ ​ — ​ ​ 1,188 Juniper Landscaping Holdings LLC ​ ​ — ​ ​ 2,387 JZ Capital Partners Ltd. ​ ​ 5,714 ​ ​ — Max Solutions Inc. ​ ​ 2,755 ​ ​ — PlayMonster LLC ​ ​ — ​ ​ 2,867 Power Service Group CR Acquisition Inc. (d/b/a Power Plant Services) ​ ​ 2,090 ​ ​ — Solar Holdings Bidco Limited (1)(2) ​ ​ 3,700 ​ ​ — Source Code Holdings, LLC (d/b/a Source Code Corporation) ​ ​ — ​ ​ 2,185 Telestream Holdings Corporation ​ ​ 346 ​ ​ — True Blue Car Wash, LLC ​ ​ 59 ​ ​ 1,145 Total unfunded delayed draw loan commitments ​ ​ 21,230 ​ ​ 28,060 Total Unfunded Commitments ​ $ 37,031 ​ $ 53,113 (1) Unfunded commitments denominated in non-USD currencies have been converted to USD using the exchange rate as of the applicable reporting date. (2) Principal amount is non-USD denominated and is based in British pounds. At the option of the borrower, amounts borrowed under the delayed draw term loan commitment can be US dollars, Canadian dollars or British pounds.

STOCKHOLDERS' EQUITY (Tables)

STOCKHOLDERS' EQUITY (Tables)	9 Months Ended
	Sep. 30, 2022
STOCKHOLDERS' EQUITY
Schedule of stockholder's equity	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three months ended September 30, Nine months ended September 30, ($ in thousands except share and per share amounts) 2022 2021 2022 2021 Shares Issued from Equity Offering ​ ​ — ​ — ​ ​ — ​ — Shares Issued from ATM Program ​ — ​ 94,897 ​ ​ 16,678 ​ 256,952 Shares Issued from DRIP ​ — ​ 119,381 ​ ​ 63,743 ​ 133,890 Total Shares Issued ​ ​ — ​ ​ 214,278 ​ ​ 80,421 ​ ​ 390,842 Proceeds, before offering expenses ​ $ — ​ $ 3,320 ​ $ 1,225 ​ $ 6,113 Average Price Per Share (1) ​ $ — ​ $ 15.49 ​ $ 15.23 ​ $ 15.64

FINANCIAL HIGHLIGHTS (Tables)

FINANCIAL HIGHLIGHTS (Tables)	9 Months Ended
	Sep. 30, 2022
FINANCIAL HIGHLIGHTS
Schedule of financial highlights	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Nine months ended September 30, ​ ​ 2022 2021 Per share data: (1) ​ ​ ​ Net asset value, beginning of period ​ $ 15.10 $ 15.23 ​ Investment operations: ​ ​ ​ Net investment income ​ 1.13 ​ 1.03 ​ Net realized and unrealized gains(losses) on investments and foreign currency transactions ​ ​ (0.40) ​ ​ 0.27 ​ Net increase in net assets resulting from operations ​ 0.73 ​ 1.30 ​ Distributions declared from net investment income ​ (1.07) ​ (1.07) ​ Net asset value, end of period ​ $ 14.76 $ 15.46 ​ Total annualized return based on market value (2) ​ (37.95) % ​ 15.82 % Total annualized return based on net asset value ​ 6.49 % ​ 11.26 % Net assets, end of period ​ $ 343,019 ​ $ 323,724 ​ Per share market value at end of period ​ $ 11.10 ​ $ 15.22 ​ Shares outstanding end of period ​ 23,243,088 ​ 20,936,874 ​ Ratios/Supplemental Data: (3) ​ ​ ​ Ratio of expenses before incentive fees to average net assets (4) ​ 11.95 % 10.70 % Ratio of incentive fees to average net assets ​ 1.64 % 2.81 % Ratio of total expenses to average net assets (4) ​ 13.59 % 13.51 % Ratio of net investment income to average net assets (4) ​ 10.05 % 8.91 % Portfolio turnover ratio ​ 28.41 % 49.34 % (1) Based on actual number of shares outstanding at the end of the period or the weighted average shares outstanding for the period, unless otherwise noted, as appropriate. (2) Total return is based on the change in market price per share during the period and takes into account distributions, if any, reinvested in accordance with the DRIP. (3) With the exception of the portfolio turnover rate, ratios are reported on an annualized basis. (4) Calculated using total expenses, including income tax provision.

CHANGE IN NET ASSETS RESULTIN_2

CHANGE IN NET ASSETS RESULTING FROM OPERATIONS PER COMMON SHARE (Tables)	9 Months Ended
	Sep. 30, 2022
CHANGE IN NET ASSETS RESULTING FROM OPERATIONS PER COMMON SHARE
Schedule of computation of basic and diluted per share net increase in net assets resulting from operations	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended September 30, ​ Nine Months Ended September 30, ($ in thousands except share and per share amounts) 2022 2021 2022 2021 Net increase in net assets resulting from operations ​ $ 3,845 ​ $ 8,275 ​ $ 16,901 ​ $ 26,951 Weighted average shares outstanding ​ 23,243,088 ​ 20,851,435 ​ 23,224,990 ​ 20,677,545 Basic and diluted per share net increase in net assets resulting from operations ​ $ 0.17 ​ $ 0.40 ​ $ 0.73 ​ $ 1.30

ORGANIZATION (Details)

ORGANIZATION (Details) - LIBOR	9 Months Ended
	Sep. 30, 2022
Minimum [Member]
Debt Instrument [Line Items]
Term of interest	3 years
Maximum [Member]
Debt Instrument [Line Items]
Term of interest	6 years

SUMMARY OF SIGNIFICANT ACCOUN_3

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional information (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2022	Dec. 31, 2021
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Percentage of investment owned	100%
Unrecognized tax benefits	$ 0	$ 0
Accrued for interest or penalties	0	0
Cost of investments for federal income tax	776,044	835,502
Net unrealized depreciation	11,490	16,293
Gross unrealized appreciation	12,146	10,770
Gross unrealized depreciation	$ 23,636	$ 27,062

FORWARD CURRENCY CONTRACTS - Fo

FORWARD CURRENCY CONTRACTS - Forward Currency Contracts (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
FORWARD CURRENCY CONTRACTS
Realized gain (loss) on forward currency contracts	$ (6)	$ (206)	$ (348)	$ (209)
Foreign currency forward contracts
FORWARD CURRENCY CONTRACTS
Realized gain (loss) on forward currency contracts		1	(8)	(3)
Unrealized appreciation (depreciation) on forward currency contracts	10	187	10	186
Total net realized and unrealized gains (losses) on forward currency contracts	$ 10	$ 188	$ 2	$ 183

FORWARD CURRENCY CONTRACTS - Un

FORWARD CURRENCY CONTRACTS - Unrealized Appreciation or Depreciation On Forward Currency Contracts (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2022 USD ($)
Fair value
Unrealized appreciation	$ 10
Morgan Stanley
Fair value
Unrealized appreciation	$ 10
Morgan Stanley | CAD
Fair value
Currency to be sold	199
Morgan Stanley | USD
Fair value
Currency to be purchased	155

FORWARD CURRENCY CONTRACTS - No

FORWARD CURRENCY CONTRACTS - Notional Exposure to Foreign Currency Forward Contracts (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
FORWARD CURRENCY CONTRACTS
Forward currency contracts	$ 10	$ 187	$ 10	$ 186
Foreign currency forward contracts
FORWARD CURRENCY CONTRACTS
Forward currency contracts	$ 125	$ 13,980	$ 186	$ 4,754

FORWARD CURRENCY CONTRACTS - Co

FORWARD CURRENCY CONTRACTS - Collateral Received or Pledged (Details) $ in Thousands	Sep. 30, 2022 USD ($)
FORWARD CURRENCY CONTRACTS
Net Amount of Derivative Assets	$ 10
Morgan Stanley
FORWARD CURRENCY CONTRACTS
Derivative Assets Subject to Master Netting Agreement	10
Net Amount of Derivative Assets	10
Morgan Stanley | Foreign currency forward contracts
FORWARD CURRENCY CONTRACTS
Derivative Assets Subject to Master Netting Agreement	10
Net Amount of Derivative Assets	$ 10

INVESTMENTS - Schedule of Inves

INVESTMENTS - Schedule of Investments (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Investments
Investments, amortized cost	$ 773,406	$ 831,960
Investments	764,554	819,208
First lien secured loans
Investments
Investments, amortized cost	622,517	709,318
Investments	615,945	697,232
Second lien secured loans
Investments
Investments, amortized cost	24,529	25,484
Investments	20,383	23,650
Subordinated Notes
Investments
Investments, amortized cost	167	167
Investments	167	167
Subordinated Note to STRS JV
Investments
Investments, amortized cost	80,000	60,000
Investments	80,000	60,000
Equity (excluding STRS JV)
Investments
Investments, amortized cost	26,193	21,991
Investments	25,993	22,552
Equity in STRS JV
Investments
Investments, amortized cost	20,000	15,000
Investments	$ 22,066	$ 15,607

INVESTMENTS - Portfolio by Indu

INVESTMENTS - Portfolio by Industry Grouping (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Investments
Investments	$ 764,554	$ 819,208
Percent of net assets	222.86%	234.24%
Advertising
Investments
Investments	$ 9,782
Air Freight & Logistics
Investments
Investments	3,557
Application Software
Investments
Investments	13,411	$ 13,518
Building Products
Investments
Investments	14,305	16,603
Construction & Engineering
Investments
Investments	8,625	13,975
Data Processing & Outsourced Services
Investments
Investments	14,507	16,160
Diversified Support Services
Investments
Investments	11,741	10,489
Electronic Equipment & Instruments
Investments
Investments	13,485	6,687
Environmental & Facilities Services
Investments
Investments	18,641	6,872
Household Appliances
Investments
Investments	7,773
Industrial Machinery
Investments
Investments	15,276	6,815
Internet & Direct Marketing Retail
Investments
Investments	19,114	15,353
Investment Banking & Brokerage
Investments
Investments	5,687	10,054
Leisure Products
Investments
Investments	9,044	8,930
Packaged Foods & Meats
Investments
Investments	11,998	25,606
Personal Products
Investments
Investments	3,698	4,273
Real Estate Operating Companies
Investments
Investments	10,722	4,780
Research & Consulting Services
Investments
Investments	8,832	8,901
Systems Software
Investments
Investments		9,898
Technology Hardware, Storage & Peripherals
Investments
Investments	14,991	14,725
Investments Excluding STRS JV's
Investments
Investments	$ 662,488	$ 743,601
Percent of net assets	100%	100%
Investments Excluding STRS JV's | Advertising
Investments
Investments	$ 219	$ 9,738
Percent of net assets		1.30%
Investments Excluding STRS JV's | Air Freight & Logistics
Investments
Investments	$ 16,046	$ 21,379
Percent of net assets	2.40%	2.90%
Investments Excluding STRS JV's | Alternative Carriers
Investments
Investments	$ 11,993
Percent of net assets	1.80%
Investments Excluding STRS JV's | Application Software
Investments
Investments	$ 18,145	$ 22,590
Percent of net assets	2.70%	3%
Investments Excluding STRS JV's | Asset Management & Custody Banks
Investments
Investments	$ 10,169
Percent of net assets	1.50%
Investments Excluding STRS JV's | Automotive Retail
Investments
Investments	$ 14,594	$ 15,286
Percent of net assets	2.20%	2.10%
Investments Excluding STRS JV's | Broadcasting
Investments
Investments	$ 7,942	$ 8,027
Percent of net assets	1.20%	1.10%
Investments Excluding STRS JV's | Building Products
Investments
Investments	$ 25,317	$ 44,184
Percent of net assets	3.80%	5.90%
Investments Excluding STRS JV's | Cable & Satellite
Investments
Investments	$ 14,323	$ 14,526
Percent of net assets	2.20%	2%
Investments Excluding STRS JV's | Commodity Chemicals
Investments
Investments	$ 16,003	$ 15,172
Percent of net assets	2.40%	2%
Investments Excluding STRS JV's | Construction & Engineering
Investments
Investments		$ 11,086
Percent of net assets		1.50%
Investments Excluding STRS JV's | Construction Materials
Investments
Investments	$ 8,168	$ 7,673
Percent of net assets	1.20%	1%
Investments Excluding STRS JV's | Consumer Finance
Investments
Investments		$ 9,628
Percent of net assets		1.30%
Investments Excluding STRS JV's | Data Processing & Outsourced Services
Investments
Investments	$ 43,387	$ 32,864
Percent of net assets	6.50%	4.40%
Investments Excluding STRS JV's | Department Stores
Investments
Investments		$ 13,538
Percent of net assets		1.80%
Investments Excluding STRS JV's | Distributors
Investments
Investments	$ 3,618	$ 4,025
Percent of net assets	0.50%	0.50%
Investments Excluding STRS JV's | Diversified Chemicals
Investments
Investments	$ 13,941	$ 18,360
Percent of net assets	2.10%	2.50%
Investments Excluding STRS JV's | Diversified Support Services
Investments
Investments	$ 11,309	$ 11,618
Percent of net assets	1.70%	1.60%
Investments Excluding STRS JV's | Education Services
Investments
Investments	$ 13,403	$ 13,398
Percent of net assets	2%	1.80%
Investments Excluding STRS JV's | Electric Utilities
Investments
Investments	$ 10,408	$ 10,296
Percent of net assets	1.60%	1.40%
Investments Excluding STRS JV's | Electronic Equipment & Instruments
Investments
Investments		$ 6,687
Percent of net assets		0.90%
Investments Excluding STRS JV's | Environmental & Facilities Services
Investments
Investments	$ 18,769	$ 32,998
Percent of net assets	2.80%	4.40%
Investments Excluding STRS JV's | Health Care Facilities
Investments
Investments	$ 10,318	$ 25,576
Percent of net assets	1.60%	3.40%
Investments Excluding STRS JV's | Health Care Services
Investments
Investments	$ 32,756	$ 58,055
Percent of net assets	4.90%	7.80%
Investments Excluding STRS JV's | Health Care Supplies
Investments
Investments	$ 23,354
Percent of net assets	3.50%
Investments Excluding STRS JV's | Heavy Electrical Equipment
Investments
Investments	$ 13,897	$ 11,088
Percent of net assets	2.10%	1.50%
Investments Excluding STRS JV's | Home Furnishings
Investments
Investments	$ 25,311	$ 24,017
Percent of net assets	3.80%	3.20%
Investments Excluding STRS JV's | Household Appliances
Investments
Investments	$ 6,003
Percent of net assets	0.90%
Investments Excluding STRS JV's | Household Products
Investments
Investments	$ 11,414	$ 11,773
Percent of net assets	1.70%	1.60%
Investments Excluding STRS JV's | Industrial Machinery
Investments
Investments	$ 8,209
Percent of net assets	1.20%
Investments Excluding STRS JV's | Interactive Media & Services
Investments
Investments	$ 10,260	$ 20,157
Percent of net assets	1.50%	2.70%
Investments Excluding STRS JV's | Internet & Direct Marketing Retail
Investments
Investments	$ 40,312	$ 45,668
Percent of net assets	6.10%	6.10%
Investments Excluding STRS JV's | Investment Banking & Brokerage
Investments
Investments	$ 18,372	$ 19,603
Percent of net assets	2.80%	2.60%
Investments Excluding STRS JV's | IT Consulting & Other Services
Investments
Investments	$ 15,471	$ 19,162
Percent of net assets	2.30%	2.60%
Investments Excluding STRS JV's | Leisure Facilities
Investments
Investments	$ 22,089	$ 22,142
Percent of net assets	3.30%	3%
Investments Excluding STRS JV's | Leisure Products
Investments
Investments	$ 5,608	$ 3,072
Percent of net assets	0.90%	0.40%
Investments Excluding STRS JV's | Life Sciences Tools & Services
Investments
Investments	$ 4,912	$ 4,925
Percent of net assets	0.80%	0.70%
Investments Excluding STRS JV's | Office Services & Supplies
Investments
Investments	$ 25,039	$ 20,921
Percent of net assets	3.80%	2.80%
Investments Excluding STRS JV's | Other Diversified Financial Services
Investments
Investments	$ 3,823	$ 3,492
Percent of net assets	0.70%	0.50%
Investments Excluding STRS JV's | Packaged Foods & Meats
Investments
Investments	$ 10,922	$ 10,862
Percent of net assets	1.60%	1.50%
Investments Excluding STRS JV's | Paper Packaging
Investments
Investments	$ 8,499
Percent of net assets	1.40%
Investments Excluding STRS JV's | Personal Products
Investments
Investments	$ 13,566	$ 12,260
Percent of net assets	2.10%	1.60%
Investments Excluding STRS JV's | Real Estate Operating Companies
Investments
Investments		$ 5,431
Percent of net assets		0.70%
Investments Excluding STRS JV's | Research & Consulting Services
Investments
Investments	$ 22,316	$ 23,822
Percent of net assets	3.40%	3.20%
Investments Excluding STRS JV's | Specialized Consumer Services
Investments
Investments	$ 37,949	$ 36,225
Percent of net assets	5.70%	4.90%
Investments Excluding STRS JV's | Systems Software
Investments
Investments	$ 17,525	$ 19,160
Percent of net assets	2.70%	2.60%
Investments Excluding STRS JV's | Technology Hardware, Storage & Peripherals
Investments
Investments	$ 16,809	$ 23,117
Percent of net assets	2.60%	3.10%

INVESTMENTS - Affiliated and Co

INVESTMENTS - Affiliated and Controlled Persons (Details) $ in Thousands, $ in Thousands	3 Months Ended			9 Months Ended			12 Months Ended
	Sep. 30, 2022 USD ($)	Dec. 31, 2021 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2022 CAD ($)	Sep. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2021 CAD ($)	Jun. 24, 2022 USD ($)	Jan. 24, 2022 USD ($)
Investments in and Advances to Affiliates [Line Items]
Weighted average remaining term of debt investments				3 years 6 months	3 years 6 months		3 years 9 months 18 days	3 years 9 months 18 days
Fair value of non-accrual loans	$ 0	$ 10,046		$ 0			$ 10,046
Cost of investment	773,406	831,960		773,406			831,960
Realized investment gain		562		(15,537)		$ 7,714
Schedule of investments in and advances to affiliated and controlled persons
Beginning Fair Value				819,208
Net Change in Unrealized Appreciation (Depreciation)				4,159		(2,234)
Ending Fair Value	764,554	819,208		764,554			819,208
PlayMonster LLC | First Lien Secured Term Loan and First Lien Secured Delayed Draw Loan [Member]
Investments in and Advances to Affiliates [Line Items]
Cost of investment										$ 7,045
PlayMonster LLC | First Lien Revolving Loan Investment [Member]
Investments in and Advances to Affiliates [Line Items]
Cost of investment									$ 437
Non-controlled affiliate company investments
Investments in and Advances to Affiliates [Line Items]
Realized investment gain				1,725
Schedule of investments in and advances to affiliated and controlled persons
Dividends and interest included in income				489			1,190
Beginning Fair Value				6,874		15,717	15,717
Purchases				8,713
Sales				(1,088)			(10,000)
Net Change in Unrealized Appreciation (Depreciation)	(389)		$ 792	(2,596)		1,112	1,187
Ending Fair Value	11,903	6,874		11,903			6,874
Controlled affiliate company investments
Schedule of investments in and advances to affiliated and controlled persons
Dividends and interest included in income				9,381			8,214
Beginning Fair Value				75,607		51,240	51,240
Purchases				25,000			23,659
Net Change in Unrealized Appreciation (Depreciation)	(212)		$ 860	1,459		591	708
Ending Fair Value	102,066	75,607		102,066			75,607
Investment, Identifier [Axis]: ABB/Con-cise Optical Group LLC First Lien Secured Revolving Loan
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 2,058			$ 2,058
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:ABBCon-ciseOpticalGroupLLCMember	whf:ABBCon-ciseOpticalGroupLLCMember
Investment type	whf:FirstLienSecuredRevolvingLoanMember			whf:FirstLienSecuredRevolvingLoanMember
Ending Fair Value	$ 2,073			$ 2,073
Investment, Identifier [Axis]: ABB/Con-cise Optical Group LLC First Lien Secured Term Loan
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 21,141			$ 21,141
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:ABBCon-ciseOpticalGroupLLCMember	whf:ABBCon-ciseOpticalGroupLLCMember
Investment type	whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Ending Fair Value	$ 21,281			$ 21,281
Investment, Identifier [Axis]: ALM Media, LLC First Lien Secured Term Loan
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 13,467	$ 14,011		$ 13,467			$ 14,011
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:ALMMediaLLCMember	whf:ALMMediaLLCMember		whf:ALMMediaLLCMember	whf:ALMMediaLLCMember
Investment type	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Beginning Fair Value				$ 13,996
Ending Fair Value	$ 13,458	$ 13,996		13,458			$ 13,996
Investment, Identifier [Axis]: AST Applications Software Technology LLC First Lien Secured Term Loan
Investments in and Advances to Affiliates [Line Items]
Cost of investment		$ 3,943					$ 3,943
Schedule of investments in and advances to affiliated and controlled persons
Issuer name							whf:ASTApplicationsSoftwareTechnologyLLCMember	whf:ASTApplicationsSoftwareTechnologyLLCMember
Investment type		whf:FirstLienSecuredTermLoanMember					whf:FirstLienSecuredTermLoanMember
Beginning Fair Value				3,958
Ending Fair Value		$ 3,958					$ 3,958
Investment, Identifier [Axis]: ATSG Inc First Lien Secured Term Loan
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 13,649	$ 13,736		$ 13,649			$ 13,736
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:ATSGIncMember	whf:ATSGIncMember		whf:ATSGIncMember	whf:ATSGIncMember
Investment type	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Beginning Fair Value				$ 13,736
Ending Fair Value	$ 13,653	$ 13,736		13,653			$ 13,736
Investment, Identifier [Axis]: Access USA Shipping, LLC First Lien Secured Term Loan
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 4,699	$ 4,906		$ 4,699			$ 4,906
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:AccessUSAShippingLLCMember	whf:AccessUSAShippingLLCMember		whf:AccessUSAShippingLLCMember	whf:AccessUSAShippingLLCMember
Investment type	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Beginning Fair Value				$ 4,937
Ending Fair Value	$ 4,718	$ 4,937		4,718			$ 4,937
Investment, Identifier [Axis]: Aeyon LLC First Lien Secured Term Loan
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 8,777			$ 8,777
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:AeyonLLCMember	whf:AeyonLLCMember
Investment type	whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Ending Fair Value	$ 8,858			$ 8,858
Investment, Identifier [Axis]: American Crafts, LC First Lien Secured Delayed Draw Loan
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 1,344			$ 1,344
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:AmericanCraftsLCMember	whf:AmericanCraftsLCMember
Investment type	whf:FirstLienSecuredDelayedDrawLoanMember			whf:FirstLienSecuredDelayedDrawLoanMember
Ending Fair Value	$ 1,195			$ 1,195
Investment, Identifier [Axis]: American Crafts, LC First Lien Secured Term Loan
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 8,050	$ 8,325		$ 8,050			$ 8,325
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:AmericanCraftsLCMember	whf:AmericanCraftsLCMember		whf:AmericanCraftsLCMember	whf:AmericanCraftsLCMember
Investment type	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Beginning Fair Value				$ 8,325
Ending Fair Value	$ 7,114	$ 8,325		7,114			$ 8,325
Investment, Identifier [Axis]: Arcole Holding Corporation Shares
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 6,944	$ 6,944		$ 6,944			$ 6,944
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:ArcoleHoldingCorporationMember	whf:ArcoleHoldingCorporationMember		whf:ArcoleHoldingCorporationMember	whf:ArcoleHoldingCorporationMember
Investment type	Common Stock	Common Stock		Common Stock			Common Stock
Dividends and interest included in income				$ 261			$ 897
Beginning Fair Value				6,874		6,448	6,448
Net Change in Unrealized Appreciation (Depreciation)				(579)			426
Ending Fair Value	$ 6,295	$ 6,874		6,295			6,874
Investment, Identifier [Axis]: Arcstor Midco, LLC First Lien Secured Term Loan
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 18,970	$ 19,018		$ 18,970			$ 19,018
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:ArcstorMidcoLLCMember	whf:ArcstorMidcoLLCMember		whf:ArcstorMidcoLLCMember	whf:ArcstorMidcoLLCMember
Investment type	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Beginning Fair Value				$ 19,160
Ending Fair Value	$ 17,525	$ 19,160		17,525			$ 19,160
Investment, Identifier [Axis]: Atlas Purchaser, Inc First Lien Secured Term Loan
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 2,595			$ 2,595
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:AtlasPurchaserIncMember	whf:AtlasPurchaserIncMember
Investment type	whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Ending Fair Value	$ 2,562			$ 2,562
Investment, Identifier [Axis]: Atlas Purchaser, Inc Second Lien Secured Term Loan
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 14,628	$ 14,586		$ 14,628			$ 14,586
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:AtlasPurchaserIncMember	whf:AtlasPurchaserIncMember		whf:AtlasPurchaserIncMember	whf:AtlasPurchaserIncMember
Investment type	whf:SecondLienSecuredTermLoanMember	whf:SecondLienSecuredTermLoanMember		whf:SecondLienSecuredTermLoanMember			whf:SecondLienSecuredTermLoanMember
Beginning Fair Value				$ 14,700
Ending Fair Value	$ 12,197	$ 14,700		12,197			$ 14,700
Investment, Identifier [Axis]: Avision Holdings, LLC Class A LLC Interests
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 251	$ 250		$ 251			$ 250
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:AvisionHoldingsLLCMember	whf:AvisionHoldingsLLCMember		whf:AvisionHoldingsLLCMember	whf:AvisionHoldingsLLCMember
Investment type	whf:ClassALLCInterestsMember	whf:ClassALLCInterestsMember		whf:ClassALLCInterestsMember			whf:ClassALLCInterestsMember
Beginning Fair Value				$ 250
Ending Fair Value	$ 219	$ 250		219			$ 250
Investment, Identifier [Axis]: BBQ Buyer, LLC First Lien Secured Delayed Draw Loan
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 2,553	$ 2,523		$ 2,553			$ 2,523
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:BBQBuyerLLCMember	whf:BBQBuyerLLCMember		whf:BBQBuyerLLCMember	whf:BBQBuyerLLCMember
Investment type	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember		whf:FirstLienSecuredDelayedDrawLoanMember			whf:FirstLienSecuredDelayedDrawLoanMember
Beginning Fair Value				$ 2,523
Ending Fair Value	$ 2,559	$ 2,523		2,559			$ 2,523
Investment, Identifier [Axis]: BBQ Buyer, LLC First Lien Secured Term Loan
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 12,533	$ 12,388		$ 12,533			$ 12,388
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:BBQBuyerLLCMember	whf:BBQBuyerLLCMember		whf:BBQBuyerLLCMember	whf:BBQBuyerLLCMember
Investment type	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Beginning Fair Value				$ 12,623
Ending Fair Value	$ 12,616	$ 12,623		12,616			$ 12,623
Investment, Identifier [Axis]: BBQ Buyer, LLC Shares
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 1,100	$ 1,100		$ 1,100			$ 1,100
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:BBQBuyerLLCMember	whf:BBQBuyerLLCMember		whf:BBQBuyerLLCMember	whf:BBQBuyerLLCMember
Investment type	Common Stock	Common Stock		Common Stock			Common Stock
Beginning Fair Value				$ 2,442
Ending Fair Value	$ 1,954	$ 2,442		1,954			$ 2,442
Investment, Identifier [Axis]: BL Products Parent, LP Class A Units
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 667			$ 667
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:BLProductsParentLPMember	whf:BLProductsParentLPMember
Investment type	whf:ClassAUnitsMember			whf:ClassAUnitsMember
Ending Fair Value	$ 668			$ 668
Investment, Identifier [Axis]: BLP Buyer, Inc., First Lien Secured Revolving Loan, Floor 1.00%, Spread L plus 6.25%, Rate 7.44%, Due 2/1/27
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 269			$ 269
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:BLProductsParentLPMember	whf:BLProductsParentLPMember
Investment type	whf:FirstLienSecuredRevolvingLoanMember			whf:FirstLienSecuredRevolvingLoanMember
Ending Fair Value	$ 271			$ 271
Investment, Identifier [Axis]: BLP Buyer, Inc., First Lien Secured Revolving Loan, Floor 1.00%, Spread L plus 6.25%, Rate 7.54%, Due 2/1/27
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 8,066			$ 8,066
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:BLProductsParentLPMember	whf:BLProductsParentLPMember
Investment type	whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Ending Fair Value	$ 8,080			$ 8,080
Investment, Identifier [Axis]: BPII-JL Group Holdings LP Class A Units
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 825	$ 825		$ 825			$ 825
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:BPII-JLGroupHoldingsLPMember	whf:BPII-JLGroupHoldingsLPMember		whf:BPII-JLGroupHoldingsLPMember	whf:BPII-JLGroupHoldingsLPMember
Investment type	whf:ClassAUnitsMember	whf:ClassAUnitsMember		whf:ClassAUnitsMember			whf:ClassAUnitsMember
Beginning Fair Value				$ 825
Ending Fair Value	$ 661	$ 825		$ 661			$ 825
Investment, Identifier [Axis]: Bridgepoint Healthcare, LLC First Lien Secured Delayed Draw Loan
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:BridgepointHealthcareLLCMember	whf:BridgepointHealthcareLLCMember		whf:BridgepointHealthcareLLCMember	whf:BridgepointHealthcareLLCMember
Investment type	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember		whf:FirstLienSecuredDelayedDrawLoanMember			whf:FirstLienSecuredDelayedDrawLoanMember
Ending Fair Value	$ (11)			$ (11)
Investment, Identifier [Axis]: Bridgepoint Healthcare, LLC First Lien Secured Revolving Loan
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:BridgepointHealthcareLLCMember	whf:BridgepointHealthcareLLCMember		whf:BridgepointHealthcareLLCMember	whf:BridgepointHealthcareLLCMember
Investment type	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember		whf:FirstLienSecuredRevolvingLoanMember			whf:FirstLienSecuredRevolvingLoanMember
Ending Fair Value	$ (8)			$ (8)
Investment, Identifier [Axis]: Bridgepoint Healthcare, LLC First Lien Secured Term Loan
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 10,392	$ 10,770		$ 10,392			$ 10,770
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:BridgepointHealthcareLLCMember	whf:BridgepointHealthcareLLCMember		whf:BridgepointHealthcareLLCMember	whf:BridgepointHealthcareLLCMember
Investment type	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Beginning Fair Value				$ 10,769
Ending Fair Value	$ 10,337	$ 10,769		10,337			$ 10,769
Investment, Identifier [Axis]: Bulk Midco, LLC First Lien Secured Term Loan
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 14,891	$ 14,936		$ 14,891			$ 14,936
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:BulkMidcoLLCMember	whf:BulkMidcoLLCMember		whf:BulkMidcoLLCMember	whf:BulkMidcoLLCMember
Investment type	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Beginning Fair Value				$ 14,526
Ending Fair Value	$ 14,323	$ 14,526		14,323			$ 14,526
Investment, Identifier [Axis]: CHS Therapy, LLC First Lien Secured Term Loan A
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 7,079	$ 7,175		$ 7,079			$ 7,175
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:CHSTherapyLLCMember	whf:CHSTherapyLLCMember		whf:CHSTherapyLLCMember	whf:CHSTherapyLLCMember
Investment type	whf:FirstLienSecuredTermLoanAMember	whf:FirstLienSecuredTermLoanAMember		whf:FirstLienSecuredTermLoanAMember			whf:FirstLienSecuredTermLoanAMember
Beginning Fair Value				$ 7,242
Ending Fair Value	$ 7,125	$ 7,242		7,125			$ 7,242
Investment, Identifier [Axis]: CHS Therapy, LLC First Lien Secured Term Loan C
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 869	$ 879		$ 869			$ 879
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:CHSTherapyLLCMember	whf:CHSTherapyLLCMember		whf:CHSTherapyLLCMember	whf:CHSTherapyLLCMember
Investment type	whf:FirstLienSecuredTermLoanCMember	whf:FirstLienSecuredTermLoanCMember		whf:FirstLienSecuredTermLoanCMember			whf:FirstLienSecuredTermLoanCMember
Beginning Fair Value				$ 891
Ending Fair Value	$ 877	$ 891		877			$ 891
Investment, Identifier [Axis]: CX Holdco LLC Common Units
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 972	$ 972		$ 972			$ 972
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:CXHoldcoLLCMember	whf:CXHoldcoLLCMember		whf:CXHoldcoLLCMember	whf:CXHoldcoLLCMember
Investment type	whf:CommonUnitsMember	whf:CommonUnitsMember		whf:CommonUnitsMember			whf:CommonUnitsMember
Beginning Fair Value				$ 972
Ending Fair Value	$ 1,457	$ 972		$ 1,457			$ 972
Investment, Identifier [Axis]: Camp Facility Services Holdings, LLC First Lien Secured Delayed Draw Loan
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:CampFacilityServicesHoldingsLLCMember	whf:CampFacilityServicesHoldingsLLCMember		whf:CampFacilityServicesHoldingsLLCMember	whf:CampFacilityServicesHoldingsLLCMember
Investment type	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember		whf:FirstLienSecuredDelayedDrawLoanMember			whf:FirstLienSecuredDelayedDrawLoanMember
Beginning Fair Value				$ (1)
Ending Fair Value	$ (24)	$ (1)		(24)			$ (1)
Investment, Identifier [Axis]: Camp Facility Services Holdings, LLC First Lien Secured Revolving Loan
Schedule of investments in and advances to affiliated and controlled persons
Issuer name							whf:CampFacilityServicesHoldingsLLCMember	whf:CampFacilityServicesHoldingsLLCMember
Investment type		whf:FirstLienSecuredRevolvingLoanMember					whf:FirstLienSecuredRevolvingLoanMember
Investment, Identifier [Axis]: Camp Facility Services Holdings, LLC First Lien Secured Term Loan
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 11,628	$ 12,745		$ 11,628			$ 12,745
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:CampFacilityServicesHoldingsLLCMember	whf:CampFacilityServicesHoldingsLLCMember		whf:CampFacilityServicesHoldingsLLCMember	whf:CampFacilityServicesHoldingsLLCMember
Investment type	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Beginning Fair Value				$ 12,742
Ending Fair Value	$ 11,558	$ 12,742		11,558			$ 12,742
Investment, Identifier [Axis]: Camp Facility Services Parent, LLC Preferred Units
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 840	$ 840		$ 840			$ 840
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:CampFacilityServicesParentLLCMember	whf:CampFacilityServicesParentLLCMember		whf:CampFacilityServicesParentLLCMember	whf:CampFacilityServicesParentLLCMember
Investment type	whf:PreferredUnitsMember	whf:PreferredUnitsMember		whf:PreferredUnitsMember			whf:PreferredUnitsMember
Beginning Fair Value				$ 840
Ending Fair Value	$ 853	$ 840		853			$ 840
Investment, Identifier [Axis]: Cennox Holdings Limited, First Lien Secured Term Loan, Floor 1.00%, Spread L plus 6.00%, Rate 7.00%, Due 5/4/2026
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 3,868	$ 3,889		$ 3,868			$ 3,889
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:CennoxHoldingsLimitedMember	whf:CennoxHoldingsLimitedMember		whf:CennoxHoldingsLimitedMember	whf:CennoxHoldingsLimitedMember
Investment type	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Beginning Fair Value				$ 3,877
Ending Fair Value	$ 3,140	$ 3,877		3,140			$ 3,877
Investment, Identifier [Axis]: Cennox Holdings Limited, First lien Secured Revolving Loan, Floor 1.00%, Spread L plus 6.00%, Rate 7.00%, Due 5/4/2026
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 9,845	$ 1,173		$ 9,845			$ 1,173
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:CennoxHoldingsLimitedMember	whf:CennoxHoldingsLimitedMember		whf:CennoxHoldingsLimitedMember	whf:CennoxHoldingsLimitedMember
Investment type	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredRevolvingLoanMember		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredRevolvingLoanMember
Beginning Fair Value				$ 1,169
Ending Fair Value	$ 9,205	$ 1,169		9,205			$ 1,169
Investment, Identifier [Axis]: Cennox, Inc., First Lien Secured Delayed Draw Loan, Floor 1.00%, Spread L plus 6.00%, Rate 7.00%, Due 5/4/2026
Investments in and Advances to Affiliates [Line Items]
Cost of investment		$ 8,755					$ 8,755
Schedule of investments in and advances to affiliated and controlled persons
Issuer name							whf:CennoxInc.Member	whf:CennoxInc.Member
Investment type		whf:FirstLienSecuredDelayedDrawLoanMember					whf:FirstLienSecuredDelayedDrawLoanMember
Beginning Fair Value				8,915
Ending Fair Value		$ 8,915					$ 8,915
Investment, Identifier [Axis]: Cennox, Inc., First Lien Secured Revolving Loan, Floor 1.00%, Spread L plus 6.00%, Rate 7.00%, Due 5/4/2026
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 680	$ 551		$ 680			$ 551
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:CennoxHoldingsLimitedMember	whf:CennoxHoldingsLimitedMember		whf:CennoxInc.Member	whf:CennoxInc.Member
Investment type	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember		whf:FirstLienSecuredRevolvingLoanMember			whf:FirstLienSecuredRevolvingLoanMember
Beginning Fair Value				$ 569
Ending Fair Value	$ 502	$ 569		502			$ 569
Investment, Identifier [Axis]: Cennox, Inc., First Lien Secured Term Loan, Floor 1.00%, Spread L plus 6.00%, Rate 7.00%, Due 5/4/2026
Investments in and Advances to Affiliates [Line Items]
Cost of investment		$ 8,365					$ 8,365
Schedule of investments in and advances to affiliated and controlled persons
Issuer name							whf:CennoxInc.Member	whf:CennoxInc.Member
Investment type		whf:FirstLienSecuredTermLoanMember					whf:FirstLienSecuredTermLoanMember
Beginning Fair Value				8,438
Ending Fair Value		$ 8,438					$ 8,438
Investment, Identifier [Axis]: Claridge Products and Equipment, LLC First Lien Secured Revolving Loan
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 918	$ 207		$ 918			$ 207
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:ClaridgeProductsandEquipmentLLCMember	whf:ClaridgeProductsandEquipmentLLCMember		whf:ClaridgeProductsandEquipmentLLCMember	whf:ClaridgeProductsandEquipmentLLCMember
Investment type	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember		whf:FirstLienSecuredRevolvingLoanMember			whf:FirstLienSecuredRevolvingLoanMember
Beginning Fair Value				$ 204
Ending Fair Value	$ 888	$ 204		888			$ 204
Investment, Identifier [Axis]: Claridge Products and Equipment, LLC First Lien Secured Term Loan
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 7,484	$ 7,518		$ 7,484			$ 7,518
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:ClaridgeProductsandEquipmentLLCMember	whf:ClaridgeProductsandEquipmentLLCMember		whf:ClaridgeProductsandEquipmentLLCMember	whf:ClaridgeProductsandEquipmentLLCMember
Investment type	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Beginning Fair Value				$ 7,469
Ending Fair Value	$ 7,280	$ 7,469		7,280			$ 7,469
Investment, Identifier [Axis]: CleanChoice Energy, Inc First Lien Secured Term Loan
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 10,331	$ 10,299		$ 10,331			$ 10,299
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:CleanChoiceEnergyIncMember	whf:CleanChoiceEnergyIncMember		whf:CleanChoiceEnergyIncMember	whf:CleanChoiceEnergyIncMember
Investment type	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Beginning Fair Value				$ 10,296
Ending Fair Value	$ 10,408	$ 10,296		$ 10,408			$ 10,296
Investment, Identifier [Axis]: Coastal Television Broadcasting Group LLC First Lien Secured Revolving Loan
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:CoastalTelevisionBroadcastingGroupLLCMember	whf:CoastalTelevisionBroadcastingGroupLLCMember		whf:CoastalTelevisionBroadcastingGroupLLCMember	whf:CoastalTelevisionBroadcastingGroupLLCMember
Investment type	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember		whf:FirstLienSecuredRevolvingLoanMember			whf:FirstLienSecuredRevolvingLoanMember
Ending Fair Value	$ (4)			$ (4)
Investment, Identifier [Axis]: Coastal Television Broadcasting Group LLC First Lien Secured Term Loan
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 8,052	$ 8,027		$ 8,052			$ 8,027
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:CoastalTelevisionBroadcastingGroupLLCMember	whf:CoastalTelevisionBroadcastingGroupLLCMember		whf:CoastalTelevisionBroadcastingGroupLLCMember	whf:CoastalTelevisionBroadcastingGroupLLCMember
Investment type	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Beginning Fair Value				$ 8,027
Ending Fair Value	$ 7,946	$ 8,027		7,946			$ 8,027
Investment, Identifier [Axis]: Crown Brands LLC First Lien Secured Term Loan
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 357			$ 357
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:CrownBrandsLLCMember	whf:CrownBrandsLLCMember
Investment type	whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Ending Fair Value	$ 344			$ 344
Investment, Identifier [Axis]: Crown Brands LLC Second Lien Secured Delayed Draw Loan
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 651	$ 650		$ 651			$ 650
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:CrownBrandsLLCMember	whf:CrownBrandsLLCMember		whf:CrownBrandsLLCMember	whf:CrownBrandsLLCMember
Investment type	whf:SecondLienSecuredDelayedDrawLoanMember	whf:SecondLienSecuredDelayedDrawLoanMember		whf:SecondLienSecuredDelayedDrawLoanMember			whf:SecondLienSecuredDelayedDrawLoanMember
Beginning Fair Value				$ 520
Ending Fair Value	$ 423	$ 520		423			$ 520
Investment, Identifier [Axis]: Crown Brands LLC Second Lien Secured Term Loan
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 4,318	$ 4,299		$ 4,318			$ 4,299
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:CrownBrandsLLCMember	whf:CrownBrandsLLCMember		whf:CrownBrandsLLCMember	whf:CrownBrandsLLCMember
Investment type	whf:SecondLienSecuredTermLoanMember	whf:SecondLienSecuredTermLoanMember		whf:SecondLienSecuredTermLoanMember			whf:SecondLienSecuredTermLoanMember
Beginning Fair Value				$ 3,505
Ending Fair Value	$ 2,851	$ 3,505		2,851			$ 3,505
Investment, Identifier [Axis]: DCA Investment Holding, LLC First Lien Secured Delayed Draw Loan
Investments in and Advances to Affiliates [Line Items]
Cost of investment		$ 672					$ 672
Schedule of investments in and advances to affiliated and controlled persons
Issuer name							whf:DCAInvestmentHoldingLLCMember	whf:DCAInvestmentHoldingLLCMember
Investment type		whf:FirstLienSecuredDelayedDrawLoanMember					whf:FirstLienSecuredDelayedDrawLoanMember
Beginning Fair Value				688
Ending Fair Value		$ 688					$ 688
Investment, Identifier [Axis]: DCA Investment Holding, LLC First Lien Secured Term Loan
Investments in and Advances to Affiliates [Line Items]
Cost of investment		$ 6,933					$ 6,933
Schedule of investments in and advances to affiliated and controlled persons
Issuer name							whf:DCAInvestmentHoldingLLCMember	whf:DCAInvestmentHoldingLLCMember
Investment type		whf:FirstLienSecuredTermLoanMember					whf:FirstLienSecuredTermLoanMember
Beginning Fair Value				6,988
Ending Fair Value		$ 6,988					$ 6,988
Investment, Identifier [Axis]: Drew Foam Companies Inc First Lien Secured Term Loan
Investments in and Advances to Affiliates [Line Items]
Cost of investment		$ 7,094					$ 7,094
Schedule of investments in and advances to affiliated and controlled persons
Issuer name							whf:DrewFoamCompaniesIncMember	whf:DrewFoamCompaniesIncMember
Investment type		whf:FirstLienSecuredTermLoanMember					whf:FirstLienSecuredTermLoanMember
Beginning Fair Value				7,183
Ending Fair Value		$ 7,183					$ 7,183
Investment, Identifier [Axis]: Drew Foam Companies Inc, First Lien Secured Term Loan, Floor 1.00%, Spread L plus 6.00%, Rate 7.00%, Due 11/5/2025
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 14,125	$ 7,096		$ 14,125			$ 7,096
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:DrewFoamCompaniesIncMember	whf:DrewFoamCompaniesIncMember		whf:DrewFoamCompaniesIncMember	whf:DrewFoamCompaniesIncMember
Investment type	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Beginning Fair Value				$ 7,183
Ending Fair Value	$ 14,305	$ 7,183		14,305			$ 7,183
Investment, Identifier [Axis]: E-Phoenix Acquisition Co. Inc., First Lien Secured Term Loan, Floor 1.00%, Spread L plus 5.75%, Rate 6.75%, Due 6/23/2027
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 8,799	$ 8,852		$ 8,799			$ 8,852
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:E-PhoenixAcquisitionCo.Inc.Member	whf:E-PhoenixAcquisitionCo.Inc.Member		whf:E-PhoenixAcquisitionCo.Inc.Member	whf:E-PhoenixAcquisitionCo.Inc.Member
Investment type	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Beginning Fair Value				$ 8,901
Ending Fair Value	$ 8,832	$ 8,901		8,832			$ 8,901
Investment, Identifier [Axis]: Eddy Acquisitions, LLC Preferred Units
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 167	$ 167		$ 167			$ 167
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:EddyAcquisitionsLLCMember	whf:EddyAcquisitionsLLCMember		whf:EddyAcquisitionsLLCMember	whf:EddyAcquisitionsLLCMember
Investment type	whf:PreferredUnitsMember	whf:PreferredUnitsMember		whf:PreferredUnitsMember			whf:PreferredUnitsMember
Beginning Fair Value				$ 167
Ending Fair Value	$ 118	$ 167		118			$ 167
Investment, Identifier [Axis]: Education Networks of America, Inc First Lien Secured Term Loan
Investments in and Advances to Affiliates [Line Items]
Cost of investment		$ 4,511					$ 4,511
Schedule of investments in and advances to affiliated and controlled persons
Issuer name							whf:EducationNetworksofAmericaIncMember	whf:EducationNetworksofAmericaIncMember
Investment type		whf:FirstLienSecuredTermLoanMember					whf:FirstLienSecuredTermLoanMember
Beginning Fair Value				$ 4,508
Ending Fair Value		$ 4,508					$ 4,508
Investment, Identifier [Axis]: EducationDynamics, LLC First Lien Secured Delayed Draw Loan
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:EducationDynamicsLLCMember	whf:EducationDynamicsLLCMember		whf:EducationDynamicsLLCMember	whf:EducationDynamicsLLCMember
Investment type	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember		whf:FirstLienSecuredDelayedDrawLoanMember			whf:FirstLienSecuredDelayedDrawLoanMember
Ending Fair Value	$ (3)			$ (3)
Investment, Identifier [Axis]: EducationDynamics, LLC First Lien Secured Revolving Loan
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 236			$ 236
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:EducationDynamicsLLCMember	whf:EducationDynamicsLLCMember		whf:EducationDynamicsLLCMember	whf:EducationDynamicsLLCMember
Investment type	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember		whf:FirstLienSecuredRevolvingLoanMember			whf:FirstLienSecuredRevolvingLoanMember
Ending Fair Value	$ 234			$ 234
Investment, Identifier [Axis]: EducationDynamics, LLC First Lien Secured Term Loan
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 12,912	$ 13,068		$ 12,912			$ 13,068
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:EducationDynamicsLLCMember	whf:EducationDynamicsLLCMember		whf:EducationDynamicsLLCMember	whf:EducationDynamicsLLCMember
Investment type	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Beginning Fair Value				$ 13,064
Ending Fair Value	$ 12,887	$ 13,064		12,887			$ 13,064
Investment, Identifier [Axis]: EducationDynamics, LLC Subordinated Unsecured Term Loan
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 167	$ 167		$ 167			$ 167
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:EducationDynamicsLLCMember	whf:EducationDynamicsLLCMember		whf:EducationDynamicsLLCMember	whf:EducationDynamicsLLCMember
Investment type	whf:SubordinatedUnsecuredTermLoanMember	whf:SubordinatedUnsecuredTermLoanMember		whf:SubordinatedUnsecuredTermLoanMember			whf:SubordinatedUnsecuredTermLoanMember
Beginning Fair Value				$ 167
Ending Fair Value	$ 167	$ 167		167			$ 167
Investment, Identifier [Axis]: Empire Office, Inc First Lien Secured Delayed Draw Loan
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 4,792			$ 4,792
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:EmpireOfficeIncMember	whf:EmpireOfficeIncMember		whf:EmpireOfficeIncMember	whf:EmpireOfficeIncMember
Investment type	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember		whf:FirstLienSecuredDelayedDrawLoanMember			whf:FirstLienSecuredDelayedDrawLoanMember
Beginning Fair Value				$ 7
Ending Fair Value	$ 4,820	$ 7		4,820			$ 7
Investment, Identifier [Axis]: Empire Office, Inc First Lien Secured Term Loan
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 11,923	$ 12,507		$ 11,923			$ 12,507
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:EmpireOfficeIncMember	whf:EmpireOfficeIncMember		whf:EmpireOfficeIncMember	whf:EmpireOfficeIncMember
Investment type	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Beginning Fair Value				$ 12,589
Ending Fair Value	$ 11,910	$ 12,589		11,910			$ 12,589
Investment, Identifier [Axis]: Epiphany Business Services, LLC First Lien Secured Delayed Draw Loan
Investments in and Advances to Affiliates [Line Items]
Cost of investment		$ 3,008					$ 3,008
Schedule of investments in and advances to affiliated and controlled persons
Issuer name							whf:EpiphanyBusinessServicesLLCMember	whf:EpiphanyBusinessServicesLLCMember
Investment type		whf:FirstLienSecuredDelayedDrawLoanMember					whf:FirstLienSecuredDelayedDrawLoanMember
Beginning Fair Value				3,027
Ending Fair Value		$ 3,027					$ 3,027
Investment, Identifier [Axis]: Epiphany Business Services, LLC First Lien Secured Revolving Loan
Schedule of investments in and advances to affiliated and controlled persons
Issuer name							whf:EpiphanyBusinessServicesLLCMember	whf:EpiphanyBusinessServicesLLCMember
Investment type		whf:FirstLienSecuredRevolvingLoanMember					whf:FirstLienSecuredRevolvingLoanMember
Beginning Fair Value				3
Ending Fair Value		$ 3					$ 3
Investment, Identifier [Axis]: Epiphany Business Services, LLC First Lien Secured Term Loan
Investments in and Advances to Affiliates [Line Items]
Cost of investment		$ 4,214					$ 4,214
Schedule of investments in and advances to affiliated and controlled persons
Issuer name							whf:EpiphanyBusinessServicesLLCMember	whf:EpiphanyBusinessServicesLLCMember
Investment type		whf:FirstLienSecuredTermLoanMember					whf:FirstLienSecuredTermLoanMember
Beginning Fair Value				4,235
Ending Fair Value		$ 4,235					$ 4,235
Investment, Identifier [Axis]: Escalon Services Inc First Lien Secured Term Loan
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 16,599	$ 7,490		$ 16,599			$ 7,490
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:EscalonServicesIncMember	whf:EscalonServicesIncMember		whf:EscalonServicesIncMember	whf:EscalonServicesIncMember
Investment type	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Beginning Fair Value				$ 8,046
Ending Fair Value	$ 17,797	$ 8,046		17,797			$ 8,046
Investment, Identifier [Axis]: Escalon Services Inc Warrants
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 476	$ 476		$ 476			$ 476
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:EscalonServicesIncMember	whf:EscalonServicesIncMember		whf:EscalonServicesIncMember	whf:EscalonServicesIncMember
Investment type	Warrant	Warrant		Warrant			Warrant
Beginning Fair Value				$ 893
Ending Fair Value	$ 2,368	$ 893		2,368			$ 893
Investment, Identifier [Axis]: FR Flow Control CB LLC, First Lien Secured Term Loan B, Floor 1.00%, Spread L plus 5.50%, Rate 6.50%, Due 6/28/2026
Investments in and Advances to Affiliates [Line Items]
Cost of investment		$ 6,727					$ 6,727
Schedule of investments in and advances to affiliated and controlled persons
Issuer name							whf:FRFlowControlCBLLCMember	whf:FRFlowControlCBLLCMember
Investment type		whf:FirstLienSecuredTermLoanBMember					whf:FirstLienSecuredTermLoanBMember
Beginning Fair Value				6,815
Ending Fair Value		$ 6,815					$ 6,815
Investment, Identifier [Axis]: Flexitallic Group SAS First Lien Secured Term Loan
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 15,777	$ 15,047		$ 15,777			$ 15,047
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:FlexitallicGroupSASMember	whf:FlexitallicGroupSASMember		whf:FlexitallicGroupSASMember	whf:FlexitallicGroupSASMember
Investment type	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Beginning Fair Value				$ 15,172
Ending Fair Value	$ 16,003	$ 15,172		16,003			$ 15,172
Investment, Identifier [Axis]: Future Payment Technologies, LP First Lien Secured Term Loan
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 23,074	$ 23,811		$ 23,074			$ 23,811
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:FuturePaymentTechnologiesLPMember	whf:FuturePaymentTechnologiesLPMember		whf:FuturePaymentTechnologiesLPMember	whf:FuturePaymentTechnologiesLPMember
Investment type	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Beginning Fair Value				$ 23,925
Ending Fair Value	$ 23,222	$ 23,925		$ 23,222			$ 23,925
Investment, Identifier [Axis]: Geo Logic Systems Ltd., First Lien Secured Revolving Loan, Floor 1.00%, Spread C plus 6.50%, Rate 7.50%, Due 12/19/2024
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:GeoLogicSystemsLtdMember	whf:GeoLogicSystemsLtdMember		whf:GeoLogicSystemsLtdMember	whf:GeoLogicSystemsLtdMember
Investment type	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember		whf:FirstLienSecuredRevolvingLoanMember			whf:FirstLienSecuredRevolvingLoanMember
Beginning Fair Value				$ 4
Ending Fair Value	$ 2	$ 4		2			$ 4
Investment, Identifier [Axis]: Geo Logic Systems Ltd., First Lien Secured Term Loan, Floor 1.00%, Spread C plus 6.50%, Rate 7.50%, Due 12/19/2024
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 15,497	$ 15,766		$ 15,497			$ 15,766
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:GeoLogicSystemsLtdMember	whf:GeoLogicSystemsLtdMember		whf:GeoLogicSystemsLtdMember	whf:GeoLogicSystemsLtdMember
Investment type	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Beginning Fair Value				$ 16,156
Ending Fair Value	$ 14,505	$ 16,156		14,505			$ 16,156
Investment, Identifier [Axis]: Grupo HIMA San Pablo, Inc Amended Term Loan
Investments in and Advances to Affiliates [Line Items]
Cost of investment		$ 1,704					$ 1,704
Schedule of investments in and advances to affiliated and controlled persons
Issuer name							whf:GrupoHIMASanPabloIncMember	whf:GrupoHIMASanPabloIncMember
Investment type		whf:AmendedTermLoanMember					whf:AmendedTermLoanMember
Beginning Fair Value				1,708
Ending Fair Value		$ 1,708					$ 1,708
Investment, Identifier [Axis]: Grupo HIMA San Pablo, Inc First Lien Secured Term Loan A
Investments in and Advances to Affiliates [Line Items]
Cost of investment		$ 3,476					$ 3,476
Schedule of investments in and advances to affiliated and controlled persons
Issuer name							whf:GrupoHIMASanPabloIncMember	whf:GrupoHIMASanPabloIncMember
Investment type		whf:FirstLienSecuredTermLoanAMember					whf:FirstLienSecuredTermLoanAMember
Beginning Fair Value				1,169
Ending Fair Value		$ 1,169					$ 1,169
Investment, Identifier [Axis]: Grupo HIMA San Pablo, Inc First Lien Secured Term Loan B
Investments in and Advances to Affiliates [Line Items]
Cost of investment		$ 12,185					$ 12,185
Schedule of investments in and advances to affiliated and controlled persons
Issuer name							whf:GrupoHIMASanPabloIncMember	whf:GrupoHIMASanPabloIncMember
Investment type		whf:FirstLienSecuredTermLoanBMember					whf:FirstLienSecuredTermLoanBMember
Beginning Fair Value				4,097
Ending Fair Value		$ 4,097					$ 4,097
Investment, Identifier [Axis]: Grupo HIMA San Pablo, Inc Second Lien Secured Term Loan
Investments in and Advances to Affiliates [Line Items]
Cost of investment		$ 1,024					$ 1,024
Schedule of investments in and advances to affiliated and controlled persons
Issuer name							whf:GrupoHIMASanPabloIncMember	whf:GrupoHIMASanPabloIncMember
Investment type		whf:SecondLienSecuredTermLoanMember					whf:SecondLienSecuredTermLoanMember
Investment, Identifier [Axis]: Grupo HIMA San Pablo, Inc Superpriority Delayed Draw Loan
Investments in and Advances to Affiliates [Line Items]
Cost of investment		$ 568					$ 568
Schedule of investments in and advances to affiliated and controlled persons
Issuer name							whf:GrupoHIMASanPabloIncMember	whf:GrupoHIMASanPabloIncMember
Investment type		whf:SuperpriorityDelayedDrawLoanMember					whf:SuperpriorityDelayedDrawLoanMember
Beginning Fair Value				$ 568
Ending Fair Value		$ 568					$ 568
Investment, Identifier [Axis]: HC Salon Holdings, Inc First Lien Secured Revolving Loan
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:HCSalonHoldingsIncMember	whf:HCSalonHoldingsIncMember		whf:HCSalonHoldingsIncMember	whf:HCSalonHoldingsIncMember
Investment type	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember		whf:FirstLienSecuredRevolvingLoanMember			whf:FirstLienSecuredRevolvingLoanMember
Ending Fair Value	$ 11			$ 11
Investment, Identifier [Axis]: HC Salon Holdings, Inc First Lien Secured Term Loan
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 11,365	$ 11,417		$ 11,365			$ 11,417
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:HCSalonHoldingsIncMember	whf:HCSalonHoldingsIncMember		whf:HCSalonHoldingsIncMember	whf:HCSalonHoldingsIncMember
Investment type	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Beginning Fair Value				$ 11,416
Ending Fair Value	$ 11,550	$ 11,416		11,550			$ 11,416
Investment, Identifier [Axis]: HRG Management, LLC First Lien Secured Delayed Draw Loan
Investments in and Advances to Affiliates [Line Items]
Cost of investment		$ 644					$ 644
Schedule of investments in and advances to affiliated and controlled persons
Issuer name							whf:HRGManagementLLCMember	whf:HRGManagementLLCMember
Investment type		whf:FirstLienSecuredDelayedDrawLoanMember					whf:FirstLienSecuredDelayedDrawLoanMember
Beginning Fair Value				651
Ending Fair Value		$ 651					$ 651
Investment, Identifier [Axis]: HRG Management, LLC First Lien Secured Revolving Loan
Schedule of investments in and advances to affiliated and controlled persons
Issuer name							whf:HRGManagementLLCMember	whf:HRGManagementLLCMember
Investment type		whf:FirstLienSecuredRevolvingLoanMember					whf:FirstLienSecuredRevolvingLoanMember
Investment, Identifier [Axis]: HRG Management, LLC First Lien Secured Term Loan
Investments in and Advances to Affiliates [Line Items]
Cost of investment		$ 4,781					$ 4,781
Schedule of investments in and advances to affiliated and controlled persons
Issuer name							whf:HRGManagementLLCMember	whf:HRGManagementLLCMember
Investment type		whf:FirstLienSecuredTermLoanMember					whf:FirstLienSecuredTermLoanMember
Beginning Fair Value				4,780
Ending Fair Value		$ 4,780					$ 4,780
Investment, Identifier [Axis]: HRG Management, LLC, First Lien Secured Delayed Draw Loan, Floor 1.00%, Spread L plus 6.25%, Rate 7.29%, Due 10/19/2026
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 1,257			$ 1,257
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				HRG Management, LLC (d/b/a HomeRiver Group, LLC)	HRG Management, LLC (d/b/a HomeRiver Group, LLC)
Investment type	whf:FirstLienSecuredDelayedDrawLoanMember			whf:FirstLienSecuredDelayedDrawLoanMember
Ending Fair Value	$ 1,242			$ 1,242
Investment, Identifier [Axis]: HRG Management, LLC, First Lien Secured Revolving Loan, Floor 1.00%, Spread L plus 6.25%, Rate 7.29%, Due 10/19/2026
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				HRG Management, LLC (d/b/a HomeRiver Group, LLC)	HRG Management, LLC (d/b/a HomeRiver Group, LLC)
Investment type	whf:FirstLienSecuredRevolvingLoanMember			whf:FirstLienSecuredRevolvingLoanMember
Ending Fair Value	$ (4)			$ (4)
Investment, Identifier [Axis]: HRG Management, LLC, First Lien Secured Term Loan, Floor 1.00%, Spread L plus 6.25%, Rate 7.25%, Due 10/19/2026
Investments in and Advances to Affiliates [Line Items]
Cost of investment		$ 4,781					$ 4,781
Schedule of investments in and advances to affiliated and controlled persons
Issuer name							HRG Management, LLC (d/b/a HomeRiver Group, LLC)	HRG Management, LLC (d/b/a HomeRiver Group, LLC)
Investment type		whf:FirstLienSecuredTermLoanMember					whf:FirstLienSecuredTermLoanMember
Beginning Fair Value				4,780
Ending Fair Value		$ 4,780					$ 4,780
Investment, Identifier [Axis]: HRG Management, LLC, First Lien Secured Term Loan, Floor 1.00%, Spread L plus 6.25%, Rate 7.29%, Due 10/19/2026
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 9,520			$ 9,520
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				HRG Management, LLC (d/b/a HomeRiver Group, LLC)	HRG Management, LLC (d/b/a HomeRiver Group, LLC)
Investment type	whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Ending Fair Value	$ 9,484			$ 9,484
Investment, Identifier [Axis]: Hollander Intermediate LLC First Lien Secured Term Loan
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 4,849			$ 4,849
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:HollanderIntermediateLlcMember	whf:HollanderIntermediateLlcMember
Investment type	whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Ending Fair Value	$ 4,671			$ 4,671
Investment, Identifier [Axis]: Honors Holdings, LLC First Lien Secured Delayed Draw Loan
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 4,618	$ 4,611		$ 4,618			$ 4,611
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:HonorsHoldingsLLCMember	whf:HonorsHoldingsLLCMember		whf:HonorsHoldingsLLCMember	whf:HonorsHoldingsLLCMember
Investment type	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember		whf:FirstLienSecuredDelayedDrawLoanMember			whf:FirstLienSecuredDelayedDrawLoanMember
Beginning Fair Value				$ 4,578
Ending Fair Value	$ 4,603	$ 4,578		4,603			$ 4,578
Investment, Identifier [Axis]: Honors Holdings, LLC First Lien Secured Term Loan
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 9,337	$ 9,315		$ 9,337			$ 9,315
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:HonorsHoldingsLLCMember	whf:HonorsHoldingsLLCMember		whf:HonorsHoldingsLLCMember	whf:HonorsHoldingsLLCMember
Investment type	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Beginning Fair Value				$ 9,296
Ending Fair Value	$ 9,346	$ 9,296		9,346			$ 9,296
Investment, Identifier [Axis]: I And I Sales Group, LLC First Lien Secured Delayed Draw Loan
Investments in and Advances to Affiliates [Line Items]
Cost of investment		$ 388					$ 388
Schedule of investments in and advances to affiliated and controlled persons
Issuer name							whf:IAndISalesGroupLLCMember	whf:IAndISalesGroupLLCMember
Investment type		whf:FirstLienSecuredDelayedDrawLoanMember					whf:FirstLienSecuredDelayedDrawLoanMember
Beginning Fair Value				388
Ending Fair Value		$ 388					$ 388
Investment, Identifier [Axis]: I And I Sales Group, LLC First Lien Secured Revolving Loan
Schedule of investments in and advances to affiliated and controlled persons
Issuer name							whf:IAndISalesGroupLLCMember	whf:IAndISalesGroupLLCMember
Investment type		whf:FirstLienSecuredRevolvingLoanMember					whf:FirstLienSecuredRevolvingLoanMember
Investment, Identifier [Axis]: I And I Sales Group, LLC First Lien Secured Term Loan
Investments in and Advances to Affiliates [Line Items]
Cost of investment		$ 9,102					$ 9,102
Schedule of investments in and advances to affiliated and controlled persons
Issuer name							whf:IAndISalesGroupLLCMember	whf:IAndISalesGroupLLCMember
Investment type		whf:FirstLienSecuredTermLoanMember					whf:FirstLienSecuredTermLoanMember
Beginning Fair Value				9,100
Ending Fair Value		$ 9,100					$ 9,100
Investment, Identifier [Axis]: I&I Sales Group, LLC First Lien Secured Delayed Draw Loan
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 702			$ 702
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:IAndISalesGroupLLCMember	whf:IAndISalesGroupLLCMember
Investment type	whf:FirstLienSecuredDelayedDrawLoanMember			whf:FirstLienSecuredDelayedDrawLoanMember
Ending Fair Value	$ 707			$ 707
Investment, Identifier [Axis]: I&I Sales Group, LLC First Lien Secured Revolving Loan
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:IAndISalesGroupLLCMember	whf:IAndISalesGroupLLCMember
Investment type	whf:FirstLienSecuredRevolvingLoanMember			whf:FirstLienSecuredRevolvingLoanMember
Ending Fair Value	$ 1			$ 1
Investment, Identifier [Axis]: I&I Sales Group, LLC First Lien Secured Term Loan
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 9,061			$ 9,061
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:IAndISalesGroupLLCMember	whf:IAndISalesGroupLLCMember
Investment type	whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Ending Fair Value	$ 9,074			$ 9,074
Investment, Identifier [Axis]: IDIG Parent, LLC, First Lien Secured Delayed Draw Loan, Floor 1.00%, Spread L plus 6.00%, Rate 7.00%, Due 12/15/2026
Investments in and Advances to Affiliates [Line Items]
Cost of investment		$ 1,397					$ 1,397
Schedule of investments in and advances to affiliated and controlled persons
Issuer name							whf:IDIGParentLLCMember	whf:IDIGParentLLCMember
Investment type		whf:FirstLienSecuredDelayedDrawLoanMember					whf:FirstLienSecuredDelayedDrawLoanMember
Beginning Fair Value				1,411
Ending Fair Value		$ 1,411					$ 1,411
Investment, Identifier [Axis]: IDIG Parent, LLC, First Lien Secured Revolving Loan, Floor 1.00%, Spread L plus 6.00%, Rate 7.00%, Due 12/15/2026
Schedule of investments in and advances to affiliated and controlled persons
Issuer name							whf:IDIGParentLLCMember	whf:IDIGParentLLCMember
Investment type		whf:FirstLienSecuredRevolvingLoanMember					whf:FirstLienSecuredRevolvingLoanMember
Beginning Fair Value				5
Ending Fair Value		$ 5					$ 5
Investment, Identifier [Axis]: IDIG Parent, LLC, First Lien Secured Term Loan, Floor 1.00%, Spread L plus 6.00%, Rate 7.00%, Due 12/15/2026
Investments in and Advances to Affiliates [Line Items]
Cost of investment		$ 8,404					$ 8,404
Schedule of investments in and advances to affiliated and controlled persons
Issuer name							whf:IDIGParentLLCMember	whf:IDIGParentLLCMember
Investment type		whf:FirstLienSecuredTermLoanMember					whf:FirstLienSecuredTermLoanMember
Beginning Fair Value				8,482
Ending Fair Value		$ 8,482					$ 8,482
Investment, Identifier [Axis]: ITS Buyer Inc First Lien Secured Revolving Loan
Schedule of investments in and advances to affiliated and controlled persons
Issuer name							whf:ITSBuyerIncMember	whf:ITSBuyerIncMember
Investment type		whf:FirstLienSecuredRevolvingLoanMember					whf:FirstLienSecuredRevolvingLoanMember
Investment, Identifier [Axis]: ITS Buyer Inc First Lien Secured Term Loan
Investments in and Advances to Affiliates [Line Items]
Cost of investment		$ 3,540					$ 3,540
Schedule of investments in and advances to affiliated and controlled persons
Issuer name							whf:ITSBuyerIncMember	whf:ITSBuyerIncMember
Investment type		whf:FirstLienSecuredTermLoanMember					whf:FirstLienSecuredTermLoanMember
Beginning Fair Value				$ 3,539
Ending Fair Value		$ 3,539					$ 3,539
Investment, Identifier [Axis]: ITS Buyer Inc. First Lien Secured Revolving Loan
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:ITSBuyerIncMember	whf:ITSBuyerIncMember
Investment type	whf:FirstLienSecuredRevolvingLoanMember			whf:FirstLienSecuredRevolvingLoanMember
Ending Fair Value	$ 4			$ 4
Investment, Identifier [Axis]: ITS Buyer Inc. First Lien Secured Term Loan
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 3,531			$ 3,531
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:ITSBuyerIncMember	whf:ITSBuyerIncMember
Investment type	whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Ending Fair Value	$ 3,553			$ 3,553
Investment, Identifier [Axis]: ImageOne Industries, LLC Common A Units
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 2			$ 2
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:ImageOneIndustriesLLCMember	whf:ImageOneIndustriesLLCMember		whf:ImageOneIndustriesLLCMember	whf:ImageOneIndustriesLLCMember
Investment type	whf:CommonAUnitsMember	whf:CommonAUnitsMember		whf:CommonAUnitsMember			whf:CommonAUnitsMember
Beginning Fair Value				$ 158
Ending Fair Value	$ 84	$ 158		84			$ 158
Investment, Identifier [Axis]: Industrial Specialty Services USA LLC First Lien Secured Revolving Loan
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 871			$ 871
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:IndustrialSpecialtyServicesUSALLCMember	whf:IndustrialSpecialtyServicesUSALLCMember		whf:IndustrialSpecialtyServicesUSALLCMember	whf:IndustrialSpecialtyServicesUSALLCMember
Investment type	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember		whf:FirstLienSecuredRevolvingLoanMember			whf:FirstLienSecuredRevolvingLoanMember
Ending Fair Value	$ 861			$ 861
Investment, Identifier [Axis]: Industrial Specialty Services USA LLC First Lien Secured Term Loan
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 11,715	$ 11,767		$ 11,715			$ 11,767
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:IndustrialSpecialtyServicesUSALLCMember	whf:IndustrialSpecialtyServicesUSALLCMember		whf:IndustrialSpecialtyServicesUSALLCMember	whf:IndustrialSpecialtyServicesUSALLCMember
Investment type	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Beginning Fair Value				$ 11,767
Ending Fair Value	$ 11,612	$ 11,767		$ 11,612			$ 11,767
Investment, Identifier [Axis]: Inspired Beauty Brands, Inc First Lien Secured Revolving Loan
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:InspiredBeautyBrandsIncMember	whf:InspiredBeautyBrandsIncMember		whf:InspiredBeautyBrandsIncMember	whf:InspiredBeautyBrandsIncMember
Investment type	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember		whf:FirstLienSecuredRevolvingLoanMember			whf:FirstLienSecuredRevolvingLoanMember
Beginning Fair Value				$ 8
Ending Fair Value	$ (6)	$ 8		(6)			$ 8
Investment, Identifier [Axis]: Inspired Beauty Brands, Inc First Lien Secured Term Loan
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 11,650	$ 12,055		$ 11,650			$ 12,055
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:InspiredBeautyBrandsIncMember	whf:InspiredBeautyBrandsIncMember		whf:InspiredBeautyBrandsIncMember	whf:InspiredBeautyBrandsIncMember
Investment type	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Beginning Fair Value				$ 12,252
Ending Fair Value	$ 11,509	$ 12,252		11,509			$ 12,252
Investment, Identifier [Axis]: IvyRehab Intermediate II, LLC First Lien Secured Delayed Draw Loan
Investments in and Advances to Affiliates [Line Items]
Cost of investment		$ 2,517					$ 2,517
Schedule of investments in and advances to affiliated and controlled persons
Issuer name							whf:IvyRehabIntermediateIILLCMember	whf:IvyRehabIntermediateIILLCMember
Investment type		whf:FirstLienSecuredDelayedDrawLoanMember					whf:FirstLienSecuredDelayedDrawLoanMember
Beginning Fair Value				2,534
Ending Fair Value		$ 2,534					$ 2,534
Investment, Identifier [Axis]: IvyRehab Intermediate II, LLC First Lien Secured Revolving Loan
Investments in and Advances to Affiliates [Line Items]
Cost of investment		$ 139					$ 139
Schedule of investments in and advances to affiliated and controlled persons
Issuer name							whf:IvyRehabIntermediateIILLCMember	whf:IvyRehabIntermediateIILLCMember
Investment type		whf:FirstLienSecuredRevolvingLoanMember					whf:FirstLienSecuredRevolvingLoanMember
Beginning Fair Value				147
Ending Fair Value		$ 147					$ 147
Investment, Identifier [Axis]: IvyRehab Intermediate II, LLC First Lien Secured Term Loan
Investments in and Advances to Affiliates [Line Items]
Cost of investment		$ 17,121					$ 17,121
Schedule of investments in and advances to affiliated and controlled persons
Issuer name							whf:IvyRehabIntermediateIILLCMember	whf:IvyRehabIntermediateIILLCMember
Investment type		whf:FirstLienSecuredTermLoanMember					whf:FirstLienSecuredTermLoanMember
Beginning Fair Value				17,366
Ending Fair Value		$ 17,366					$ 17,366
Investment, Identifier [Axis]: JVMC Holdings Corp First Lien Secured Term Loan
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 12,043	$ 12,674		$ 12,043			$ 12,674
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:JVMCHoldingsCorpMember	whf:JVMCHoldingsCorpMember		whf:JVMCHoldingsCorpMember	whf:JVMCHoldingsCorpMember
Investment type	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Beginning Fair Value				$ 12,729
Ending Fair Value	$ 12,077	$ 12,729		$ 12,077			$ 12,729
Investment, Identifier [Axis]: JZ Capital Partners Ltd First Lien Secured Delayed Draw Loan
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:JZCapitalPartnersLtdMember	whf:JZCapitalPartnersLtdMember
Investment type	whf:FirstLienSecuredDelayedDrawLoanMember			whf:FirstLienSecuredDelayedDrawLoanMember
Ending Fair Value	$ 22			$ 22
Investment, Identifier [Axis]: JZ Capital Partners Ltd First Lien Secured Term Loan
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 10,108			$ 10,108
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:JZCapitalPartnersLtdMember	whf:JZCapitalPartnersLtdMember
Investment type	whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Ending Fair Value	$ 10,147			$ 10,147
Investment, Identifier [Axis]: Juniper Landscaping Holdings LLC First Lien Secured Delayed Draw Loan
Schedule of investments in and advances to affiliated and controlled persons
Issuer name							whf:JuniperLandscapingHoldingsLLCMember	whf:JuniperLandscapingHoldingsLLCMember
Investment type		whf:FirstLienSecuredDelayedDrawLoanMember					whf:FirstLienSecuredDelayedDrawLoanMember
Investment, Identifier [Axis]: Juniper Landscaping Holdings LLC First Lien Secured Delayed Draw Loan Due 12/29/2026
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:JuniperLandscapingHoldingsLLCMember	whf:JuniperLandscapingHoldingsLLCMember
Investment type	whf:FirstLienSecuredDelayedDrawLoanMember			whf:FirstLienSecuredDelayedDrawLoanMember
Ending Fair Value	$ (3)			$ (3)
Investment, Identifier [Axis]: Juniper Landscaping Holdings LLC First Lien Secured Revolving Loan
Investments in and Advances to Affiliates [Line Items]
Cost of investment		$ 586					$ 586
Schedule of investments in and advances to affiliated and controlled persons
Issuer name							whf:JuniperLandscapingHoldingsLLCMember	whf:JuniperLandscapingHoldingsLLCMember
Investment type		whf:FirstLienSecuredRevolvingLoanMember					whf:FirstLienSecuredRevolvingLoanMember
Beginning Fair Value				$ 586
Ending Fair Value		$ 586					$ 586
Investment, Identifier [Axis]: Juniper Landscaping Holdings LLC First Lien Secured Revolving Loan Due 12/29/2026
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:JuniperLandscapingHoldingsLLCMember	whf:JuniperLandscapingHoldingsLLCMember
Investment type	whf:FirstLienSecuredRevolvingLoanMember			whf:FirstLienSecuredRevolvingLoanMember
Ending Fair Value	$ (1)			$ (1)
Investment, Identifier [Axis]: Juniper Landscaping Holdings LLC First Lien Secured Term Loan
Investments in and Advances to Affiliates [Line Items]
Cost of investment		$ 11,221					$ 11,221
Schedule of investments in and advances to affiliated and controlled persons
Issuer name							whf:JuniperLandscapingHoldingsLLCMember	whf:JuniperLandscapingHoldingsLLCMember
Investment type		whf:FirstLienSecuredTermLoanMember					whf:FirstLienSecuredTermLoanMember
Beginning Fair Value				11,220
Ending Fair Value		$ 11,220					$ 11,220
Investment, Identifier [Axis]: Juniper Landscaping Holdings LLC First Lien Secured Term Loan Due 12/29/2026
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 11,165			$ 11,165
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:JuniperLandscapingHoldingsLLCMember	whf:JuniperLandscapingHoldingsLLCMember
Investment type	whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Ending Fair Value	$ 11,151			$ 11,151
Investment, Identifier [Axis]: Keras Holdings, LLC Shares
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 496	$ 496		$ 496			$ 496
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:KerasHoldingsLLCMember	whf:KerasHoldingsLLCMember		whf:KerasHoldingsLLCMember	whf:KerasHoldingsLLCMember
Investment type	Common Stock	Common Stock		Common Stock			Common Stock
Beginning Fair Value				$ 496
Ending Fair Value	$ 361	$ 496		361			$ 496
Investment, Identifier [Axis]: LHS Borrower, LLC First Lien Secured Revolving Loan
Schedule of investments in and advances to affiliated and controlled persons
Issuer name							whf:LHSBorrowerLLCMember	whf:LHSBorrowerLLCMember
Investment type		whf:FirstLienSecuredRevolvingLoanMember					whf:FirstLienSecuredRevolvingLoanMember
Beginning Fair Value				4
Ending Fair Value		$ 4					$ 4
Investment, Identifier [Axis]: LHS Borrower, LLC First Lien Secured Term Loan
Investments in and Advances to Affiliates [Line Items]
Cost of investment		$ 9,346					$ 9,346
Schedule of investments in and advances to affiliated and controlled persons
Issuer name							whf:LHSBorrowerLLCMember	whf:LHSBorrowerLLCMember
Investment type		whf:FirstLienSecuredTermLoanMember					whf:FirstLienSecuredTermLoanMember
Beginning Fair Value				9,416
Ending Fair Value		$ 9,416					$ 9,416
Investment, Identifier [Axis]: LHS Borrower, LLC, First Lien Secured Revolving Loan, Floor 1.00%, Spread L plus 6.75%, Rate 7.75%, Due 9/30/2025
Schedule of investments in and advances to affiliated and controlled persons
Issuer name							whf:LHSBorrowerLLCMember	whf:LHSBorrowerLLCMember
Investment type		whf:FirstLienSecuredRevolvingLoanMember					whf:FirstLienSecuredRevolvingLoanMember
Beginning Fair Value				4
Ending Fair Value		$ 4					$ 4
Investment, Identifier [Axis]: LHS Borrower, LLC, First Lien Secured Term Loan, Floor 1.00%, Spread L plus 6.75%, Rate 7.75%, Due 9/30/2025
Investments in and Advances to Affiliates [Line Items]
Cost of investment		$ 9,345					$ 9,345
Schedule of investments in and advances to affiliated and controlled persons
Issuer name							whf:LHSBorrowerLLCMember	whf:LHSBorrowerLLCMember
Investment type		whf:FirstLienSecuredTermLoanMember					whf:FirstLienSecuredTermLoanMember
Beginning Fair Value				$ 9,416
Ending Fair Value		$ 9,416					$ 9,416
Investment, Identifier [Axis]: LINC Systems LLC First Lien Secured Revolving Loan Floor 1.00 Libor Plus 6.25 Rate Due 2242026
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:LINCSystemsLLCMember	whf:LINCSystemsLLCMember
Investment type	whf:FirstLienSecuredRevolvingLoanMember			whf:FirstLienSecuredRevolvingLoanMember
Ending Fair Value	$ 10			$ 10
Investment, Identifier [Axis]: LINC Systems LLC First Lien Secured Term Loan Floor 1.00 Libor Plus 6.25 Rate Due 2242026
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 9,909			$ 9,909
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:LINCSystemsLLCMember	whf:LINCSystemsLLCMember
Investment type	whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Ending Fair Value	$ 10,058			$ 10,058
Investment, Identifier [Axis]: LINC Systems, LLC, First Lien Secured Delayed Draw Loan, Floor 1.50%, Spread L plus 6.25%, Rate 7.25%, Due 2/24/2026
Investments in and Advances to Affiliates [Line Items]
Cost of investment		$ 9,951					$ 9,951
Schedule of investments in and advances to affiliated and controlled persons
Issuer name							whf:LINCSystemsLLCMember	whf:LINCSystemsLLCMember
Investment type		whf:FirstLienSecuredTermLoanMember					whf:FirstLienSecuredTermLoanMember
Beginning Fair Value				10,101
Ending Fair Value		$ 10,101					$ 10,101
Investment, Identifier [Axis]: LINC Systems, LLC, First Lien Secured Revolving Loan, Floor 1.50%, Spread L plus 6.25%, Rate 7.25%, Due 2/24/2026
Schedule of investments in and advances to affiliated and controlled persons
Issuer name							whf:LINCSystemsLLCMember	whf:LINCSystemsLLCMember
Investment type		whf:FirstLienSecuredRevolvingLoanMember					whf:FirstLienSecuredRevolvingLoanMember
Beginning Fair Value				12
Ending Fair Value		$ 12					$ 12
Investment, Identifier [Axis]: LMG Holdings, Inc First Lien Secured Revolving Loan
Schedule of investments in and advances to affiliated and controlled persons
Issuer name							whf:LMGHoldingsIncMember	whf:LMGHoldingsIncMember
Investment type		whf:FirstLienSecuredRevolvingLoanMember					whf:FirstLienSecuredRevolvingLoanMember
Investment, Identifier [Axis]: LMG Holdings, Inc First Lien Secured Term Loan
Investments in and Advances to Affiliates [Line Items]
Cost of investment		$ 6,684					$ 6,684
Schedule of investments in and advances to affiliated and controlled persons
Issuer name							whf:LMGHoldingsIncMember	whf:LMGHoldingsIncMember
Investment type		whf:FirstLienSecuredTermLoanMember					whf:FirstLienSecuredTermLoanMember
Beginning Fair Value				6,687
Ending Fair Value		$ 6,687					$ 6,687
Investment, Identifier [Axis]: LMG Holdings, Inc., First Lien Secured Revolving Loan, Floor 1.00%, Spread L plus 6.50%, Rate 7.50%, Due 4/30/2026
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 261			$ 261
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:LMGHoldingsIncMember	whf:LMGHoldingsIncMember		whf:LMGHoldingsIncMember	whf:LMGHoldingsIncMember
Investment type	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember		whf:FirstLienSecuredRevolvingLoanMember			whf:FirstLienSecuredRevolvingLoanMember
Ending Fair Value	$ 256			$ 256
Investment, Identifier [Axis]: LMG Holdings, Inc., First Lien Secured Term Loan, Floor 1.00%, Spread L plus 6.50%, Rate 7.50%, Due 4/30/2026
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 13,303	$ 6,680		$ 13,303			$ 6,680
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:LMGHoldingsIncMember	whf:LMGHoldingsIncMember		whf:LMGHoldingsIncMember	whf:LMGHoldingsIncMember
Investment type	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Beginning Fair Value				$ 6,687
Ending Fair Value	$ 13,229	$ 6,687		13,229			$ 6,687
Investment, Identifier [Axis]: LSCS Holdings, Inc Second Lien Secured Term Loan
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 4,932	$ 4,925		$ 4,932			$ 4,925
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:LSCSHoldingsIncMember	whf:LSCSHoldingsIncMember		whf:LSCSHoldingsIncMember	whf:LSCSHoldingsIncMember
Investment type	whf:SecondLienSecuredTermLoanMember	whf:SecondLienSecuredTermLoanMember		whf:SecondLienSecuredTermLoanMember			whf:SecondLienSecuredTermLoanMember
Beginning Fair Value				$ 4,925
Ending Fair Value	$ 4,912	$ 4,925		4,912			$ 4,925
Investment, Identifier [Axis]: Lab Logistics, LLC First Lien Secured Delayed Draw Loan
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 5,135	$ 5,166		$ 5,135			$ 5,166
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:LabLogisticsLLCMember	whf:LabLogisticsLLCMember		whf:LabLogisticsLLCMember	whf:LabLogisticsLLCMember
Investment type	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember		whf:FirstLienSecuredDelayedDrawLoanMember			whf:FirstLienSecuredDelayedDrawLoanMember
Beginning Fair Value				$ 5,183
Ending Fair Value	$ 5,144	$ 5,183		5,144			$ 5,183
Investment, Identifier [Axis]: Lab Logistics, LLC First Lien Secured Term Loan
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 5,446	$ 1,140		$ 5,446			$ 1,140
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:LabLogisticsLLCMember	whf:LabLogisticsLLCMember		whf:LabLogisticsLLCMember	whf:LabLogisticsLLCMember
Investment type	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Beginning Fair Value				$ 1,155
Ending Fair Value	$ 5,495	$ 1,155		5,495			$ 1,155
Investment, Identifier [Axis]: Lab Logistics, LLC Preferred Units
Investments in and Advances to Affiliates [Line Items]
Cost of investment		$ 857					$ 857
Schedule of investments in and advances to affiliated and controlled persons
Issuer name							whf:LabLogisticsLLCMember	whf:LabLogisticsLLCMember
Investment type		whf:PreferredUnitsMember					whf:PreferredUnitsMember
Beginning Fair Value				1,018
Ending Fair Value		$ 1,018					$ 1,018
Investment, Identifier [Axis]: Lenny & Larry's, LLC First Lien Secured Term Loan
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 11,175	$ 11,084		$ 11,175			$ 11,084
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:LennyLarrysLLCMember	whf:LennyLarrysLLCMember		whf:LennyLarrysLLCMember	whf:LennyLarrysLLCMember
Investment type	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Beginning Fair Value				$ 10,862
Ending Fair Value	$ 10,922	$ 10,862		10,922			$ 10,862
Investment, Identifier [Axis]: Lift Brands, Inc First Lien Secured Term Loan A
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 5,541	$ 5,570		$ 5,541			$ 5,570
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:LiftBrandsIncMember	whf:LiftBrandsIncMember		whf:LiftBrandsIncMember	whf:LiftBrandsIncMember
Investment type	whf:FirstLienSecuredTermLoanAMember	whf:FirstLienSecuredTermLoanAMember		whf:FirstLienSecuredTermLoanAMember			whf:FirstLienSecuredTermLoanAMember
Beginning Fair Value				$ 5,546
Ending Fair Value	$ 5,533	$ 5,546		5,533			$ 5,546
Investment, Identifier [Axis]: Lift Brands, Inc First Lien Secured Term Loan B
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 1,314	$ 1,259		$ 1,314			$ 1,259
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:LiftBrandsIncMember	whf:LiftBrandsIncMember		whf:LiftBrandsIncMember	whf:LiftBrandsIncMember
Investment type	whf:FirstLienSecuredTermLoanBMember	whf:FirstLienSecuredTermLoanBMember		whf:FirstLienSecuredTermLoanBMember			whf:FirstLienSecuredTermLoanBMember
Beginning Fair Value				$ 1,239
Ending Fair Value	$ 1,302	$ 1,239		1,302			$ 1,239
Investment, Identifier [Axis]: Luxury Brand Holdings, Inc First Lien Secured Term Loan
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 5,816	$ 5,844		$ 5,816			$ 5,844
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:LuxuryBrandHoldingsIncMember	whf:LuxuryBrandHoldingsIncMember		whf:LuxuryBrandHoldingsIncMember	whf:LuxuryBrandHoldingsIncMember
Investment type	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Beginning Fair Value				$ 5,940
Ending Fair Value	$ 5,854	$ 5,940		$ 5,854			$ 5,940
Investment, Identifier [Axis]: MEP-TS Midco, LLC, First Lien Secured Revolving Loan, Floor 1.00%, Spread L plus 6.00%, Rate 7.00%, Due 12/31/2026
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:MEP-TSMidcoLLCMember	whf:MEP-TSMidcoLLCMember		whf:MEP-TSMidcoLLCMember	whf:MEP-TSMidcoLLCMember
Investment type	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember		whf:FirstLienSecuredRevolvingLoanMember			whf:FirstLienSecuredRevolvingLoanMember
Beginning Fair Value				$ 28
Ending Fair Value	$ 24	$ 28		24			$ 28
Investment, Identifier [Axis]: MEP-TS Midco, LLC, First Lien Secured Term Loan, Floor 1.00%, Spread L plus 6.00%, Rate 7.00%, Due 12/31/2026
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 13,183	$ 13,247		$ 13,183			$ 13,247
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:MEP-TSMidcoLLCMember	whf:MEP-TSMidcoLLCMember		whf:MEP-TSMidcoLLCMember	whf:MEP-TSMidcoLLCMember
Investment type	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Beginning Fair Value				$ 13,490
Ending Fair Value	$ 13,387	$ 13,490		13,387			$ 13,490
Investment, Identifier [Axis]: MSI Information Services, Inc First Lien Secured Revolving Loan
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 295			$ 295
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:MSIInformationServicesIncMember	whf:MSIInformationServicesIncMember
Investment type	whf:FirstLienSecuredRevolvingLoanMember			whf:FirstLienSecuredRevolvingLoanMember
Ending Fair Value	$ 286			$ 286
Investment, Identifier [Axis]: MSI Information Services, Inc First Lien Secured Term Loan
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 7,711			$ 7,711
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:MSIInformationServicesIncMember	whf:MSIInformationServicesIncMember
Investment type	whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Ending Fair Value	$ 7,647			$ 7,647
Investment, Identifier [Axis]: Manchester Acquisition Sub LLC First Lien Secured Term Loan
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 7,575	$ 11,348		$ 7,575			$ 11,348
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:ManchesterAcquisitionSubLLCMember	whf:ManchesterAcquisitionSubLLCMember		whf:ManchesterAcquisitionSubLLCMember	whf:ManchesterAcquisitionSubLLCMember
Investment type	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Beginning Fair Value				$ 11,340
Ending Fair Value	$ 7,246	$ 11,340		7,246			$ 11,340
Investment, Identifier [Axis]: Marlin DTC-LS Midco 2, LLC First Lien Secured Term Loan
Investments in and Advances to Affiliates [Line Items]
Cost of investment		$ 4,200					$ 4,200
Schedule of investments in and advances to affiliated and controlled persons
Issuer name							whf:MarlinDTC-LSMidco2LLCMember	whf:MarlinDTC-LSMidco2LLCMember
Investment type		whf:FirstLienSecuredTermLoanMember					whf:FirstLienSecuredTermLoanMember
Beginning Fair Value				$ 4,206
Ending Fair Value		$ 4,206					$ 4,206
Investment, Identifier [Axis]: Marlin DTC-LS Midco 2, LLC, First Lien Secured Revolving Loan, Floor 1.00%, Spread L plus 6.50%, Rate 7.50%, Due 7/1/2025
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:MarlinDTC-LSMidco2LLCMember	whf:MarlinDTC-LSMidco2LLCMember		whf:MarlinDTC-LSMidco2LLCMember	whf:MarlinDTC-LSMidco2LLCMember
Investment type	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember		whf:FirstLienSecuredRevolvingLoanMember			whf:FirstLienSecuredRevolvingLoanMember
Beginning Fair Value				$ 11
Ending Fair Value	$ 9	$ 11		9			$ 11
Investment, Identifier [Axis]: Marlin DTC-LS Midco 2, LLC, First Lien Secured Term Loan, Floor 1.00%, Spread L plus 6.50%, Rate 7.50%, Due 7/1/2025
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 18,901	$ 15,153		$ 18,901			$ 15,153
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:MarlinDTC-LSMidco2LLCMember	whf:MarlinDTC-LSMidco2LLCMember		whf:MarlinDTC-LSMidco2LLCMember	whf:MarlinDTC-LSMidco2LLCMember
Investment type	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Beginning Fair Value				$ 15,342
Ending Fair Value	$ 19,105	$ 15,342		19,105			$ 15,342
Investment, Identifier [Axis]: Max Solutions Inc. Common Stock
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 400			$ 400
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				Max Solutions Inc	Max Solutions Inc
Investment type	Common Stock			Common Stock
Ending Fair Value	$ 400			$ 400
Investment, Identifier [Axis]: Max Solutions Inc. First Lien Secured Delayed Draw Loan
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:LennyLarrysLLCMember	whf:LennyLarrysLLCMember
Investment type	whf:FirstLienSecuredDelayedDrawLoanMember			whf:FirstLienSecuredDelayedDrawLoanMember
Investment, Identifier [Axis]: Max Solutions Inc. First Lien Secured Revolving Loan
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:LennyLarrysLLCMember	whf:LennyLarrysLLCMember
Investment type	whf:FirstLienSecuredRevolvingLoanMember			whf:FirstLienSecuredRevolvingLoanMember
Investment, Identifier [Axis]: Max Solutions Inc. First Lien Secured Revolving Loan CAD
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:LennyLarrysLLCMember	whf:LennyLarrysLLCMember
Investment type	whf:FirstLienSecuredRevolvingLoanMember			whf:FirstLienSecuredRevolvingLoanMember
Investment, Identifier [Axis]: Max Solutions Inc. First Lien Secured Term Loan
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 8,099			$ 8,099
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:LennyLarrysLLCMember	whf:LennyLarrysLLCMember
Investment type	whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Ending Fair Value	$ 8,099			$ 8,099
Investment, Identifier [Axis]: Maxitransfers Blocker Corp First Lien Secured Revolving Loan
Investments in and Advances to Affiliates [Line Items]
Cost of investment		$ 1,019					$ 1,019
Schedule of investments in and advances to affiliated and controlled persons
Issuer name							whf:MaxitransfersBlockerCorpMember	whf:MaxitransfersBlockerCorpMember
Investment type		whf:FirstLienSecuredRevolvingLoanMember					whf:FirstLienSecuredRevolvingLoanMember
Beginning Fair Value				1,038
Ending Fair Value		$ 1,038					$ 1,038
Investment, Identifier [Axis]: Maxitransfers Blocker Corp First Lien Secured Term Loan
Investments in and Advances to Affiliates [Line Items]
Cost of investment		$ 8,436					$ 8,436
Schedule of investments in and advances to affiliated and controlled persons
Issuer name							whf:MaxitransfersBlockerCorpMember	whf:MaxitransfersBlockerCorpMember
Investment type		whf:FirstLienSecuredTermLoanMember					whf:FirstLienSecuredTermLoanMember
Beginning Fair Value				8,590
Ending Fair Value		$ 8,590					$ 8,590
Investment, Identifier [Axis]: Meta Buyer LLC, First Lien Secured Delayed Draw Loan, Floor 1.00%, Spread L plus 6.00%, Rate 7.97%, Due 11/1/2027
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 881			$ 881
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:MetaBuyerLLCMember	whf:MetaBuyerLLCMember		whf:MetaBuyerLLCMember	whf:MetaBuyerLLCMember
Investment type	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember		whf:FirstLienSecuredDelayedDrawLoanMember			whf:FirstLienSecuredDelayedDrawLoanMember
Ending Fair Value	$ 885			$ 885
Investment, Identifier [Axis]: Meta Buyer LLC, First Lien Secured Revolving Loan, Floor 1.00%, Spread L plus 6.00%, Rate 7.97%, Due 11/1/2027
Investments in and Advances to Affiliates [Line Items]
Cost of investment		$ 246					$ 246
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:MetaBuyerLLCMember	whf:MetaBuyerLLCMember		whf:MetaBuyerLLCMember	whf:MetaBuyerLLCMember
Investment type	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember		whf:FirstLienSecuredRevolvingLoanMember			whf:FirstLienSecuredRevolvingLoanMember
Beginning Fair Value				$ 246
Ending Fair Value	$ 6	$ 246		6			$ 246
Investment, Identifier [Axis]: Meta Buyer LLC, First lien Secured Term Loan, Floor 1.00%, Spread E plus 6.00%, Rate 7.00%, Due 11/1/2027
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 13,664	$ 13,737		$ 13,664			$ 13,737
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:MetaBuyerLLCMember	whf:MetaBuyerLLCMember		whf:MetaBuyerLLCMember	whf:MetaBuyerLLCMember
Investment type	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Beginning Fair Value				$ 13,843
Ending Fair Value	$ 11,844	$ 13,843		11,844			$ 13,843
Investment, Identifier [Axis]: Meta Buyer LLC, First lien Secured Term Loan, Floor 1.00%, Spread L plus 6.00%, Rate 7.33%, Due 11/1/2027
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 967	$ 972		$ 967			$ 972
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:MetaBuyerLLCMember	whf:MetaBuyerLLCMember		whf:MetaBuyerLLCMember	whf:MetaBuyerLLCMember
Investment type	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Beginning Fair Value				$ 972
Ending Fair Value	$ 971	$ 972		971			$ 972
Investment, Identifier [Axis]: Mikawaya Holdings, LLC, First Lien Secured Term Loan, Floor 1.25%, Spread L plus 5.50%, Rate 6.75%, Due 1/29/2025
Investments in and Advances to Affiliates [Line Items]
Cost of investment		$ 2,988					$ 2,988
Schedule of investments in and advances to affiliated and controlled persons
Issuer name							whf:MikawayaHoldingsLLCMember	whf:MikawayaHoldingsLLCMember
Investment type		whf:FirstLienSecuredTermLoanMember					whf:FirstLienSecuredTermLoanMember
Beginning Fair Value				3,026
Ending Fair Value		$ 3,026					$ 3,026
Investment, Identifier [Axis]: Mills Fleet Farm Group, LLC First Lien Secured Term Loan
Investments in and Advances to Affiliates [Line Items]
Cost of investment		$ 13,331					$ 13,331
Schedule of investments in and advances to affiliated and controlled persons
Issuer name							whf:MillsFleetFarmGroupLLCMember	whf:MillsFleetFarmGroupLLCMember
Investment type		whf:FirstLienSecuredTermLoanMember					whf:FirstLienSecuredTermLoanMember
Beginning Fair Value				13,538
Ending Fair Value		$ 13,538					$ 13,538
Investment, Identifier [Axis]: Motivational CIV, LLC Class B Units
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 1,250	$ 1,250		$ 1,250			$ 1,250
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:MotivationalCIVLLCMember	whf:MotivationalCIVLLCMember		whf:MotivationalCIVLLCMember	whf:MotivationalCIVLLCMember
Investment type	whf:ClassBUnitsMember	whf:ClassBUnitsMember		whf:ClassBUnitsMember			whf:ClassBUnitsMember
Beginning Fair Value				$ 1,250
Ending Fair Value	$ 606	$ 1,250		$ 606			$ 1,250
Investment, Identifier [Axis]: Motivational Marketing, LLC First Lien Secured Revolving Loan
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:MotivationalMarketingLLCMember	whf:MotivationalMarketingLLCMember		whf:MotivationalMarketingLLCMember	whf:MotivationalMarketingLLCMember
Investment type	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember		whf:FirstLienSecuredRevolvingLoanMember			whf:FirstLienSecuredRevolvingLoanMember
Beginning Fair Value				$ 7
Ending Fair Value	$ (22)	$ 7		(22)			$ 7
Investment, Identifier [Axis]: Motivational Marketing, LLC First Lien Secured Term Loan
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 10,956	$ 11,575		$ 10,956			$ 11,575
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:MotivationalMarketingLLCMember	whf:MotivationalMarketingLLCMember		whf:MotivationalMarketingLLCMember	whf:MotivationalMarketingLLCMember
Investment type	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Beginning Fair Value				$ 11,646
Ending Fair Value	$ 10,744	$ 11,646		10,744			$ 11,646
Investment, Identifier [Axis]: NMFC Senior Loan Program I LLC Units
Schedule of investments in and advances to affiliated and controlled persons
Issuer name							whf:ArcoleHoldingCorporationMember	whf:ArcoleHoldingCorporationMember
Investment type		Equity (excluding STRS JV)					Equity (excluding STRS JV)
Dividends and interest included in income							$ 293
Beginning Fair Value						9,269	9,269
Sales							(10,000)
Net Change in Unrealized Appreciation (Depreciation)							761
Investment, Identifier [Axis]: NNA Services, LLC First Lien Secured Term Loan
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 11,264	$ 11,459		$ 11,264			$ 11,459
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:NNAServicesLLCMember	whf:NNAServicesLLCMember		whf:NNAServicesLLCMember	whf:NNAServicesLLCMember
Investment type	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Beginning Fair Value				$ 11,460
Ending Fair Value	$ 11,165	$ 11,460		$ 11,165			$ 11,460
Investment, Identifier [Axis]: NPAV Lessor Corp., First Lien Secured Revolving Loan, Floor 1.00%, Spread SF plus 6.00%, Rate 7.60%, Due 1/21/2027
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:NPAVLessorCorp.Member	whf:NPAVLessorCorp.Member
Investment type	whf:FirstLienSecuredRevolvingLoanMember			whf:FirstLienSecuredRevolvingLoanMember
Ending Fair Value	$ (16)			$ (16)
Investment, Identifier [Axis]: NPAV Lessor Corp., First Lien Secured Term Loan, Floor 1.00%, Spread SF plus 6.00%, Rate 7.60%, Due 1/21/2027
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 8,791			$ 8,791
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:NPAVLessorCorp.Member	whf:NPAVLessorCorp.Member
Investment type	whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Ending Fair Value	$ 8,588			$ 8,588
Investment, Identifier [Axis]: Naviga Inc First Lien Secured Revolving Loan
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 267	$ 168		$ 267			$ 168
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:NavigaIncMember	whf:NavigaIncMember		whf:NavigaIncMember	whf:NavigaIncMember
Investment type	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember		whf:FirstLienSecuredRevolvingLoanMember			whf:FirstLienSecuredRevolvingLoanMember
Beginning Fair Value				$ 169
Ending Fair Value	$ 261	$ 169		261			$ 169
Investment, Identifier [Axis]: Naviga Inc First Lien Secured Term Loan
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 3,184	$ 3,195		$ 3,184			$ 3,195
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:NavigaIncMember	whf:NavigaIncMember		whf:NavigaIncMember	whf:NavigaIncMember
Investment type	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Beginning Fair Value				$ 3,213
Ending Fair Value	$ 3,125	$ 3,213		3,125			$ 3,213
Investment, Identifier [Axis]: Nelson Worldwide, LLC First Lien Secured Term Loan
Investments in and Advances to Affiliates [Line Items]
Cost of investment		$ 9,976					$ 9,976
Schedule of investments in and advances to affiliated and controlled persons
Issuer name							whf:NelsonWorldwideLLCMember	whf:NelsonWorldwideLLCMember
Investment type		whf:FirstLienSecuredTermLoanMember					whf:FirstLienSecuredTermLoanMember
Beginning Fair Value				9,826
Ending Fair Value		$ 9,826					$ 9,826
Investment, Identifier [Axis]: PFB Holdco, Inc Class A Units
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 423	$ 423		$ 423			$ 423
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:PFBHoldcoIncMember	whf:PFBHoldcoIncMember		whf:PFBHoldcoIncMember	whf:PFBHoldcoIncMember
Investment type	whf:ClassAUnitsMember	whf:ClassAUnitsMember		whf:ClassAUnitsMember			whf:ClassAUnitsMember
Beginning Fair Value					$ 427
Ending Fair Value	$ 603			$ 603				$ 427
Investment, Identifier [Axis]: PFB Holdco, Inc First Lien Secured Revolving Loan Floor 2.45
Schedule of investments in and advances to affiliated and controlled persons
Issuer name							whf:PFBHoldcoIncMember	whf:PFBHoldcoIncMember
Investment type		whf:FirstLienSecuredRevolvingLoanMember					whf:FirstLienSecuredRevolvingLoanMember
Investment, Identifier [Axis]: PFB Holdco, Inc First Lien Secured Revolving Loan Floor 3.25
Schedule of investments in and advances to affiliated and controlled persons
Issuer name							whf:PFBHoldcoIncMember	whf:PFBHoldcoIncMember
Investment type		whf:FirstLienSecuredRevolvingLoanMember					whf:FirstLienSecuredRevolvingLoanMember
Investment, Identifier [Axis]: PFB Holdco, Inc First Lien Secured Term Loan CDOR
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 6,889			$ 6,889
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:PFBHoldcoIncMember	whf:PFBHoldcoIncMember
Investment type	whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Ending Fair Value	$ 6,382			$ 6,382
Investment, Identifier [Axis]: PFB Holdco, Inc First Lien Secured Term Loan Floor 2.45
Investments in and Advances to Affiliates [Line Items]
Cost of investment		$ 6,923					$ 6,923
Schedule of investments in and advances to affiliated and controlled persons
Issuer name							whf:PFBHoldcoIncMember	whf:PFBHoldcoIncMember
Investment type		whf:FirstLienSecuredTermLoanMember					whf:FirstLienSecuredTermLoanMember
Beginning Fair Value				6,998
Ending Fair Value		$ 6,998					$ 6,998
Investment, Identifier [Axis]: PFB Holdco, Inc First Lien Secured Term Loan Floor 3.25
Investments in and Advances to Affiliates [Line Items]
Cost of investment		$ 2,154					$ 2,154
Schedule of investments in and advances to affiliated and controlled persons
Issuer name							whf:PFBHoldcoIncMember	whf:PFBHoldcoIncMember
Investment type		whf:FirstLienSecuredTermLoanMember					whf:FirstLienSecuredTermLoanMember
Beginning Fair Value				$ 2,154
Ending Fair Value		$ 2,154					$ 2,154
Investment, Identifier [Axis]: PFB Holdco, Inc. First Lien Secured Revolving Loan CDOR
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:PFBHoldcoIncMember	whf:PFBHoldcoIncMember
Investment type	whf:FirstLienSecuredRevolvingLoanMember			whf:FirstLienSecuredRevolvingLoanMember
Ending Fair Value	$ 2			$ 2
Investment, Identifier [Axis]: PFB Holdco, Inc. First Lien Secured Revolving Loan LIBOR
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:PFBHoldcoIncMember	whf:PFBHoldcoIncMember
Investment type	whf:FirstLienSecuredRevolvingLoanMember			whf:FirstLienSecuredRevolvingLoanMember
Ending Fair Value	$ 1			$ 1
Investment, Identifier [Axis]: PFB Holdco, Inc. First Lien Secured Term Loan LIBOR
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 2,144			$ 2,144
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:PFBHoldcoIncMember	whf:PFBHoldcoIncMember
Investment type	whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Ending Fair Value	$ 2,154			$ 2,154
Investment, Identifier [Axis]: PG Dental New Jersey Parent, LLC First Lien Secured Revolving Loan
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 347	$ 689		$ 347			$ 689
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:PGDentalNewJerseyParentLLCMember	whf:PGDentalNewJerseyParentLLCMember		whf:PGDentalNewJerseyParentLLCMember	whf:PGDentalNewJerseyParentLLCMember
Investment type	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember		whf:FirstLienSecuredRevolvingLoanMember			whf:FirstLienSecuredRevolvingLoanMember
Beginning Fair Value				$ 631
Ending Fair Value	$ 308	$ 631		308			$ 631
Investment, Identifier [Axis]: PG Dental New Jersey Parent, LLC First Lien Secured Term Loan
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 14,640	$ 15,178		$ 14,640			$ 15,178
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:PGDentalNewJerseyParentLLCMember	whf:PGDentalNewJerseyParentLLCMember		whf:PGDentalNewJerseyParentLLCMember	whf:PGDentalNewJerseyParentLLCMember
Investment type	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Beginning Fair Value				$ 14,212
Ending Fair Value	$ 13,807	$ 14,212		$ 13,807			$ 14,212
Investment, Identifier [Axis]: PPS CR Acquisition, Inc First Lien Secured Delayed Draw Loan
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:PPSCRAcquisitionIncMember	whf:PPSCRAcquisitionIncMember
Investment type	whf:FirstLienSecuredDelayedDrawLoanMember			whf:FirstLienSecuredDelayedDrawLoanMember
Ending Fair Value	$ (1)			$ (1)
Investment, Identifier [Axis]: PPS CR Acquisition, Inc First Lien Secured Revolving Loan
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 103	$ 103		$ 103			$ 103
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:PPSCRAcquisitionIncMember	whf:PPSCRAcquisitionIncMember		whf:PPSCRAcquisitionIncMember	whf:PPSCRAcquisitionIncMember
Investment type	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember		whf:FirstLienSecuredRevolvingLoanMember			whf:FirstLienSecuredRevolvingLoanMember
Beginning Fair Value				$ 113
Ending Fair Value	$ 63	$ 113		63			$ 113
Investment, Identifier [Axis]: PPS CR Acquisition, Inc First Lien Secured Term Loan
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 13,942	$ 10,924		$ 13,942			$ 10,924
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:PPSCRAcquisitionIncMember	whf:PPSCRAcquisitionIncMember		whf:PPSCRAcquisitionIncMember	whf:PPSCRAcquisitionIncMember
Investment type	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Beginning Fair Value				$ 10,975
Ending Fair Value	$ 13,835	$ 10,975		13,835			$ 10,975
Investment, Identifier [Axis]: PS Lightwave, Inc., First Lien Secured Delayed Draw Loan, Floor 1.50%, Spread L plus 6.75%, Rate 8.25%, Due 3/10/2025
Schedule of investments in and advances to affiliated and controlled persons
Issuer name							whf:PSLightwaveInc.Member	whf:PSLightwaveInc.Member
Investment type		whf:FirstLienSecuredDelayedDrawLoanMember					whf:FirstLienSecuredDelayedDrawLoanMember
Beginning Fair Value				5
Ending Fair Value		$ 5					$ 5
Investment, Identifier [Axis]: PS Lightwave, Inc., First Lien Secured Term Loan, Floor 1.50%, Spread L plus 6.75%, Rate 8.25%, Due 3/10/2025
Investments in and Advances to Affiliates [Line Items]
Cost of investment		$ 7,207					$ 7,207
Schedule of investments in and advances to affiliated and controlled persons
Issuer name							whf:PSLightwaveInc.Member	whf:PSLightwaveInc.Member
Investment type		whf:FirstLienSecuredTermLoanMember					whf:FirstLienSecuredTermLoanMember
Beginning Fair Value				7,230
Ending Fair Value		$ 7,230					$ 7,230
Investment, Identifier [Axis]: Patagonia Hold co Llc First Lien Secured Term Loans
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 12,040			$ 12,040
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:PatagoniaHoldcoLLCMember	whf:PatagoniaHoldcoLLCMember
Investment type	whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Ending Fair Value	$ 11,993			$ 11,993
Investment, Identifier [Axis]: Pennsylvania Machine Works, LLC, First Lien Secured Term Loan, Floor 1.00%, Spread SF plus 6.25%, Rate 8.57%, Due 3/8/27
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 6,833			$ 6,833
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:PennsylvaniaMachineWorksLLCMember	whf:PennsylvaniaMachineWorksLLCMember
Investment type	whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Ending Fair Value	$ 6,925			$ 6,925
Investment, Identifier [Axis]: PlayMonster LLC First Lien Secured Delayed Draw Loan
Investments in and Advances to Affiliates [Line Items]
Cost of investment		$ 221					$ 221
Schedule of investments in and advances to affiliated and controlled persons
Issuer name							PlayMonster LLC	PlayMonster LLC
Investment type		whf:FirstLienSecuredDelayedDrawLoanMember					whf:FirstLienSecuredDelayedDrawLoanMember
Beginning Fair Value				$ (828)
Ending Fair Value		$ (828)					$ (828)
Investment, Identifier [Axis]: PlayMonster LLC First Lien Secured Term Loan
Investments in and Advances to Affiliates [Line Items]
Cost of investment		$ 5,894					$ 5,894
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				PlayMonster LLC	PlayMonster LLC		PlayMonster LLC	PlayMonster LLC
Investment type	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredRevolvingLoanMember			whf:FirstLienSecuredTermLoanMember
Dividends and interest included in income				$ 13
Beginning Fair Value				3,900
Purchases				1,088
Sales				$ (1,088)
Ending Fair Value		$ 3,900					$ 3,900
Investment, Identifier [Axis]: Playmonster Group Equity Inc Common Equity
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:PlaymonsterGroupLLCMember	whf:PlaymonsterGroupLLCMember
Investment type	Common Stock			Common Stock
Purchases				$ 460
Net Change in Unrealized Appreciation (Depreciation)				$ (460)
Investment, Identifier [Axis]: Playmonster Group Equity Inc Preferred Equity
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:PlaymonsterGroupLLCMember	whf:PlaymonsterGroupLLCMember
Investment type	us-gaap:PreferredStockMember			us-gaap:PreferredStockMember
Purchases				$ 3,600
Net Change in Unrealized Appreciation (Depreciation)				(1,501)
Ending Fair Value	$ 2,099			2,099
Investment, Identifier [Axis]: Playmonster Group Equity, Inc Common Stock
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 460			$ 460
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:PlaymonsterGroupEquityIncMember	whf:PlaymonsterGroupEquityIncMember
Investment type	Common Stock			Common Stock
Investment, Identifier [Axis]: Playmonster Group Equity, Inc. Preferred Stock
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 3,600			$ 3,600
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:PlaymonsterGroupEquityIncMember	whf:PlaymonsterGroupEquityIncMember
Investment type	us-gaap:PreferredStockMember			us-gaap:PreferredStockMember
Ending Fair Value	$ 2,099			$ 2,099
Investment, Identifier [Axis]: Playmonster Group LLC First Lien Secured Term Loan
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 3,565			$ 3,565
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:PlaymonsterGroupLLCMember	whf:PlaymonsterGroupLLCMember
Investment type	whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Dividends and interest included in income				$ 215
Purchases				3,565
Net Change in Unrealized Appreciation (Depreciation)				(56)
Ending Fair Value	$ 3,509			3,509
Investment, Identifier [Axis]: Potpourri Group, Inc First Lien Secured Term Loan
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 16,383	$ 16,955		$ 16,383			$ 16,955
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:PotpourriGroupIncMember	whf:PotpourriGroupIncMember		whf:PotpourriGroupIncMember	whf:PotpourriGroupIncMember
Investment type	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Beginning Fair Value				$ 17,148
Ending Fair Value	$ 16,513	$ 17,148		16,513			$ 17,148
Investment, Identifier [Axis]: Poultry Holdings LLC (HPP), First Lien Secured Term Loan, Floor 1.00%, Spread L plus 7.25%, Rate 8.25% (6.75% Cash + 1.50% PIK), Due 6/28/225
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 7,117	$ 7,676		$ 7,117			$ 7,676
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:PoultryHoldingsLLCMember	whf:PoultryHoldingsLLCMember		whf:PoultryHoldingsLLCMember	whf:PoultryHoldingsLLCMember
Investment type	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Beginning Fair Value				$ 6,993
Ending Fair Value	$ 6,914	$ 6,993		6,914			$ 6,993
Investment, Identifier [Axis]: Project Castle, Inc First Lien Secured Term Loan
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 7,521			$ 7,521
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:ProjectCastleIncMember	whf:ProjectCastleIncMember
Investment type	whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Ending Fair Value	$ 7,541			$ 7,541
Investment, Identifier [Axis]: Quest Events, LLC Preferred Units
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 331	$ 317		$ 331			$ 317
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:QuestEventsLLCMember	whf:QuestEventsLLCMember		whf:QuestEventsLLCMember	whf:QuestEventsLLCMember
Investment type	whf:PreferredUnitsMember	whf:PreferredUnitsMember		whf:PreferredUnitsMember			whf:PreferredUnitsMember
Ending Fair Value	$ 60			$ 60
Investment, Identifier [Axis]: Quest Events, LLC, First Lien Secured Revolving Loan, Floor 1.00%, Spread L plus 6.00%, Rate 7.00%, Due 12/28/2024
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 464	$ 925		$ 464			$ 925
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:QuestEventsLLCMember	whf:QuestEventsLLCMember		whf:QuestEventsLLCMember	whf:QuestEventsLLCMember
Investment type	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember		whf:FirstLienSecuredRevolvingLoanMember			whf:FirstLienSecuredRevolvingLoanMember
Beginning Fair Value				$ 760
Ending Fair Value	$ 424	$ 760		424			$ 760
Investment, Identifier [Axis]: Quest Events, LLC, First Lien Secured Term Loan, Floor 1.00%, Spread L plus 6.00%, Rate 7.00%, Due 12/28/2024
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 11,838	$ 11,848		$ 11,838			$ 11,848
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:QuestEventsLLCMember	whf:QuestEventsLLCMember		whf:QuestEventsLLCMember	whf:QuestEventsLLCMember
Investment type	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Beginning Fair Value				$ 9,729
Ending Fair Value	$ 11,317	$ 9,729		11,317			$ 9,729
Investment, Identifier [Axis]: RCKC Acquisitions LLC , First Lien Secured Delayed Draw Loan, Floor 1.00%, Spread L plus 6.25%, Rate 7.25%, Due 12/31/2026
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 2,967			$ 2,967
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:RCKCAcquisitionsLLCMember	whf:RCKCAcquisitionsLLCMember		whf:RCKCAcquisitionsLLCMember	whf:RCKCAcquisitionsLLCMember
Investment type	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember		whf:FirstLienSecuredDelayedDrawLoanMember			whf:FirstLienSecuredDelayedDrawLoanMember
Beginning Fair Value				$ (5)
Ending Fair Value	$ 2,969	$ (5)		2,969			$ (5)
Investment, Identifier [Axis]: RCKC Acquisitions LLC , First Lien Secured Revolving Loan, Floor 1.00%, Spread L plus 6.25%, Rate 7.25%, Due 12/31/2026
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 526	$ 804		$ 526			$ 804
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:RCKCAcquisitionsLLCMember	whf:RCKCAcquisitionsLLCMember		whf:RCKCAcquisitionsLLCMember	whf:RCKCAcquisitionsLLCMember
Investment type	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember		whf:FirstLienSecuredRevolvingLoanMember			whf:FirstLienSecuredRevolvingLoanMember
Beginning Fair Value				$ 814
Ending Fair Value	$ 525	$ 814		525			$ 814
Investment, Identifier [Axis]: RCKC Acquisitions LLC , First Lien Secured Term Loan, Floor 1.00%, Spread L plus 6.25%, Rate 7.25%, Due 12/312026
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 11,018	$ 11,074		$ 11,018			$ 11,074
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:RCKCAcquisitionsLLCMember	whf:RCKCAcquisitionsLLCMember		whf:RCKCAcquisitionsLLCMember	whf:RCKCAcquisitionsLLCMember
Investment type	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Beginning Fair Value				$ 11,151
Ending Fair Value	$ 11,011	$ 11,151		11,011			$ 11,151
Investment, Identifier [Axis]: RLJ Pro-Vac, Inc. First Lien Secured Term Loan
Investments in and Advances to Affiliates [Line Items]
Cost of investment		$ 8,600					$ 8,600
Schedule of investments in and advances to affiliated and controlled persons
Issuer name							whf:RLJPro-VacInc.Member	whf:RLJPro-VacInc.Member
Investment type		whf:FirstLienSecuredTermLoanMember					whf:FirstLienSecuredTermLoanMember
Beginning Fair Value				8,600
Ending Fair Value		$ 8,600					$ 8,600
Investment, Identifier [Axis]: RLJ Pro-Vac, Inc. First Lien Secured Term Loan First Lien Secured Revolving Loan
Schedule of investments in and advances to affiliated and controlled persons
Issuer name							whf:RLJPro-VacInc.Member	whf:RLJPro-VacInc.Member
Investment type		whf:FirstLienSecuredRevolvingLoanMember					whf:FirstLienSecuredRevolvingLoanMember
Investment, Identifier [Axis]: Road Safety Services, First Lien Secured Term Loan
Investments in and Advances to Affiliates [Line Items]
Cost of investment		$ 4,017					$ 4,017
Schedule of investments in and advances to affiliated and controlled persons
Issuer name							whf:RoadSafetyServicesIncMember	whf:RoadSafetyServicesIncMember
Investment type		whf:FirstLienSecuredTermLoanMember					whf:FirstLienSecuredTermLoanMember
Beginning Fair Value				4,017
Ending Fair Value		$ 4,017					$ 4,017
Investment, Identifier [Axis]: Road Safety Services, Inc., First Lien Secured Revolving Loan, Floor 3.25%, Spread P plus 5.50%, Rate 8.75%, Due 9/18/2023
Investments in and Advances to Affiliates [Line Items]
Cost of investment		$ 489					$ 489
Schedule of investments in and advances to affiliated and controlled persons
Issuer name							whf:RoadSafetyServicesIncMember	whf:RoadSafetyServicesIncMember
Investment type		whf:FirstLienSecuredRevolvingLoanMember					whf:FirstLienSecuredRevolvingLoanMember
Beginning Fair Value				501
Ending Fair Value		$ 501					$ 501
Investment, Identifier [Axis]: Road Safety Services, Inc., First Lien Secured Term Loan, Floor 1.00%, Spread L plus 6.50%, Rate 7.50%, Due 3/18/2025
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 8,534	$ 6,340		$ 8,534			$ 6,340
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:RoadSafetyServicesIncMember	whf:RoadSafetyServicesIncMember		whf:RoadSafetyServicesIncMember	whf:RoadSafetyServicesIncMember
Investment type	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Beginning Fair Value				$ 6,405
Ending Fair Value	$ 8,625	$ 6,405		8,625			$ 6,405
Investment, Identifier [Axis]: Ross-Simons Topco, LP Preferred Units
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 514	$ 600		$ 514			$ 600
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:Ross-SimonsTopcoLPMember	whf:Ross-SimonsTopcoLPMember		whf:Ross-SimonsTopcoLPMember	whf:Ross-SimonsTopcoLPMember
Investment type	whf:PreferredUnitsMember	whf:PreferredUnitsMember		whf:PreferredUnitsMember			whf:PreferredUnitsMember
Beginning Fair Value				$ 786
Ending Fair Value	$ 816	$ 786		$ 816			$ 786
Investment, Identifier [Axis]: SFS Global Holding Company Warrants
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:SFSGlobalHoldingCompanyMember	whf:SFSGlobalHoldingCompanyMember		whf:SFSGlobalHoldingCompanyMember	whf:SFSGlobalHoldingCompanyMember
Investment type	Warrant	Warrant		Warrant			Warrant
Investment, Identifier [Axis]: Sigue Corporation Warrants
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 2,890	$ 2,890		$ 2,890			$ 2,890
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:SigueCorporationMember	whf:SigueCorporationMember		whf:SigueCorporationMember	whf:SigueCorporationMember
Investment type	Warrant	Warrant		Warrant			Warrant
Beginning Fair Value				$ 3,492
Ending Fair Value	$ 3,823	$ 3,492		3,823			$ 3,492
Investment, Identifier [Axis]: Sklar Holdings, Inc First Lien Secured Term Loan
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 7,292	$ 7,295		$ 7,292			$ 7,295
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:SklarHoldingsIncMember	whf:SklarHoldingsIncMember		whf:SklarHoldingsIncMember	whf:SklarHoldingsIncMember
Investment type	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Beginning Fair Value				$ 7,020
Ending Fair Value	$ 6,695	$ 7,020		$ 6,695			$ 7,020
Investment, Identifier [Axis]: Sleep OpCo LLC First Lien Secured Revolving Loan
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:SleepOpCoLLCMember	whf:SleepOpCoLLCMember		whf:SleepOpCoLLCMember	whf:SleepOpCoLLCMember
Investment type	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember		whf:FirstLienSecuredRevolvingLoanMember			whf:FirstLienSecuredRevolvingLoanMember
Ending Fair Value	$ 10			$ 10
Investment, Identifier [Axis]: Sleep OpCo LLC First Lien Secured Term Loan
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 20,555	$ 19,651		$ 20,555			$ 19,651
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:SleepOpCoLLCMember	whf:SleepOpCoLLCMember		whf:SleepOpCoLLCMember	whf:SleepOpCoLLCMember
Investment type	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Beginning Fair Value				$ 19,645
Ending Fair Value	$ 20,630	$ 19,645		20,630			$ 19,645
Investment, Identifier [Axis]: Smalto Inc., First Lien Secured Revolving Loan, Floor 1.00%, Spread E plus 6.00%, Rate 7.25%, Due 4/29/27
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 437			$ 437
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:SmaltoInc.Member	whf:SmaltoInc.Member
Investment type	whf:FirstLienSecuredRevolvingLoanMember			whf:FirstLienSecuredRevolvingLoanMember
Ending Fair Value	$ 396			$ 396
Investment, Identifier [Axis]: Smalto Inc., First Lien Secured Revolving Loan, Floor 1.00%, Spread SF plus 6.00%, Rate 7.25%, Due 4/29/27
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 17			$ 17
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:SmaltoInc.Member	whf:SmaltoInc.Member
Investment type	whf:FirstLienSecuredRevolvingLoanMember			whf:FirstLienSecuredRevolvingLoanMember
Ending Fair Value	$ 17			$ 17
Investment, Identifier [Axis]: Smalto Inc., First Lien Secured Term Loan, Floor 1.00%, Spread E plus 6.25%, Rate 7.25%, Due 4/28/28
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 6,876			$ 6,876
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:SmaltoInc.Member	whf:SmaltoInc.Member
Investment type	whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Ending Fair Value	$ 6,364			$ 6,364
Investment, Identifier [Axis]: Smalto Inc., First Lien Secured Term Loan, Floor 1.00%, Spread SF plus 6.00%, Rate 7.18%, Due 4/28/28
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 995			$ 995
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:SmaltoInc.Member	whf:SmaltoInc.Member
Investment type	whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Ending Fair Value	$ 996			$ 996
Investment, Identifier [Axis]: Snap Fitness Holdings, Inc Class A Common Stock
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 1,941	$ 1,941		$ 1,941			$ 1,941
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:SnapFitnessHoldingsIncMember	whf:SnapFitnessHoldingsIncMember		whf:SnapFitnessHoldingsIncMember	whf:SnapFitnessHoldingsIncMember
Investment type	us-gaap:CommonClassAMember	us-gaap:CommonClassAMember		us-gaap:CommonClassAMember			us-gaap:CommonClassAMember
Beginning Fair Value				$ 188
Ending Fair Value	$ 157	$ 188		157			$ 188
Investment, Identifier [Axis]: Snap Fitness Holdings, Inc First Lien Secured Term Loan C
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 1,265	$ 1,265		$ 1,265			$ 1,265
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:SnapFitnessHoldingsIncMember	whf:SnapFitnessHoldingsIncMember		whf:SnapFitnessHoldingsIncMember	whf:SnapFitnessHoldingsIncMember
Investment type	whf:FirstLienSecuredTermLoanCMember	whf:FirstLienSecuredTermLoanCMember		whf:FirstLienSecuredTermLoanCMember			whf:FirstLienSecuredTermLoanCMember
Beginning Fair Value				$ 1,219
Ending Fair Value	$ 1,084	$ 1,219		1,084			$ 1,219
Investment, Identifier [Axis]: Snap Fitness Holdings, Inc Warrants
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 793	$ 793		$ 793			$ 793
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:SnapFitnessHoldingsIncMember	whf:SnapFitnessHoldingsIncMember		whf:SnapFitnessHoldingsIncMember	whf:SnapFitnessHoldingsIncMember
Investment type	Warrant	Warrant		Warrant			Warrant
Beginning Fair Value				$ 76
Ending Fair Value	$ 64	$ 76		$ 64			$ 76
Investment, Identifier [Axis]: Solar Holdings Bidco Limited First Lien Secured Delayed Draw Loan Interest Rate 8.94
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				Solar Holdings Bidco Limited	Solar Holdings Bidco Limited
Investment type	whf:FirstLienSecuredDelayedDrawLoanMember			whf:FirstLienSecuredDelayedDrawLoanMember
Ending Fair Value	$ (10)			$ (10)
Investment, Identifier [Axis]: Solar Holdings Bidco Limited First Lien Secured Delayed Draw Loan Interest Rate 9.74
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 51			$ 51
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				Solar Holdings Bidco Limited	Solar Holdings Bidco Limited
Investment type	whf:FirstLienSecuredDelayedDrawLoanMember			whf:FirstLienSecuredDelayedDrawLoanMember
Ending Fair Value	$ 51			$ 51
Investment, Identifier [Axis]: Solar Holdings Bidco Limited First Lien Secured Term Loan CDOR
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 2,726			$ 2,726
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				Solar Holdings Bidco Limited	Solar Holdings Bidco Limited
Investment type	whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Ending Fair Value	$ 2,704			$ 2,704
Investment, Identifier [Axis]: Solar Holdings Bidco Limited First Lien Secured Term Loan SF
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 2,706			$ 2,706
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				Solar Holdings Bidco Limited	Solar Holdings Bidco Limited
Investment type	whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Ending Fair Value	$ 2,706			$ 2,706
Investment, Identifier [Axis]: Solar Holdings Bidco Limited First Lien Secured Term Loan SONIA
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 182			$ 182
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				Solar Holdings Bidco Limited	Solar Holdings Bidco Limited
Investment type	whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Ending Fair Value	$ 184			$ 184
Investment, Identifier [Axis]: Source Code Holdings, LLC , First Lien Secured Delayed Draw Loan, Floor 1.00%, Spread L plus 6.50%, Rate 7.50%, Due 7/30/2027
Schedule of investments in and advances to affiliated and controlled persons
Issuer name							whf:SourceCodeHoldingsLLCMember	whf:SourceCodeHoldingsLLCMember
Investment type		whf:FirstLienSecuredDelayedDrawLoanMember					whf:FirstLienSecuredDelayedDrawLoanMember
Beginning Fair Value				1
Ending Fair Value		$ 1					$ 1
Investment, Identifier [Axis]: Source Code Holdings, LLC , First Lien Secured Term Loan, Floor 1.00%, Spread L plus 6.50%, Rate 7.50%, Due 7/30/2027
Investments in and Advances to Affiliates [Line Items]
Cost of investment		$ 7,487					$ 7,487
Schedule of investments in and advances to affiliated and controlled persons
Issuer name							whf:SourceCodeHoldingsLLCMember	whf:SourceCodeHoldingsLLCMember
Investment type		whf:FirstLienSecuredTermLoanMember					whf:FirstLienSecuredTermLoanMember
Beginning Fair Value				$ 7,489
Ending Fair Value		$ 7,489					$ 7,489
Investment, Identifier [Axis]: Source Code Holdings, LLC First Lien Secured Delayed Draw Loan
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:SourceCodeHoldingsLLCMember	whf:SourceCodeHoldingsLLCMember		whf:SourceCodeHoldingsLLCMember	whf:SourceCodeHoldingsLLCMember
Investment type	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember		whf:FirstLienSecuredDelayedDrawLoanMember			whf:FirstLienSecuredDelayedDrawLoanMember
Ending Fair Value	$ 21			$ 21
Investment, Identifier [Axis]: Source Code Holdings, LLC First Lien Secured Term Loan
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 14,899	$ 7,487		$ 14,899			$ 7,487
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:SourceCodeHoldingsLLCMember	whf:SourceCodeHoldingsLLCMember		whf:SourceCodeHoldingsLLCMember	whf:SourceCodeHoldingsLLCMember
Investment type	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Beginning Fair Value				$ 7,489
Ending Fair Value	$ 14,970	$ 7,489		14,970			$ 7,489
Investment, Identifier [Axis]: Stella and Chewy's LLC, First Lien Secured Delayed Draw Loan, Floor 1.00%, Spread L plus 6.75%, Rate 7.75%, Due 12/16/2025
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 1,354	$ 1,877		$ 1,354			$ 1,877
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:StellaandChewysLLCMember	whf:StellaandChewysLLCMember		whf:StellaandChewysLLCMember	whf:StellaandChewysLLCMember
Investment type	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember		whf:FirstLienSecuredDelayedDrawLoanMember			whf:FirstLienSecuredDelayedDrawLoanMember
Beginning Fair Value				$ 1,697
Ending Fair Value	$ 1,326	$ 1,697		1,326			$ 1,697
Investment, Identifier [Axis]: Stella and Chewy's LLC, First Lien Secured Term Loan, Floor 1.00%, Spread L plus 6.75%, Rate 7.75%, Due 12/16/2025
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 3,826	$ 5,228		$ 3,826			$ 5,228
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:StellaandChewysLLCMember	whf:StellaandChewysLLCMember		whf:StellaandChewysLLCMember	whf:StellaandChewysLLCMember
Investment type	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Beginning Fair Value				$ 4,967
Ending Fair Value	$ 3,758	$ 4,967		3,758			$ 4,967
Investment, Identifier [Axis]: Sunless, Inc First Lien Secured Term Loan
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 2,053			$ 2,053
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:SunlessInc.Member	whf:SunlessInc.Member
Investment type	whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Ending Fair Value	$ 2,063			$ 2,063
Investment, Identifier [Axis]: Sunless, Inc., First Lien Secured Revolving Loan, Floor 1.00%, Spread L plus 6.00%, Rate 7.00%, Due 8/13/2024
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:SunlessInc.Member	whf:SunlessInc.Member		whf:SunlessIncMember	whf:SunlessIncMember
Investment type	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember		whf:FirstLienSecuredRevolvingLoanMember			whf:FirstLienSecuredRevolvingLoanMember
Beginning Fair Value				$ 14
Ending Fair Value	$ 7	$ 14		7			$ 14
Investment, Identifier [Axis]: Sunless, Inc., First Lien Secured Term Loan, Floor 1.00%, Spread L plus 6.00%, Rate 7.00%, Due 8/13/2024
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 3,639	$ 4,185		$ 3,639			$ 4,185
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:SunlessInc.Member	whf:SunlessInc.Member		whf:SunlessIncMember	whf:SunlessIncMember
Investment type	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Beginning Fair Value				$ 4,259
Ending Fair Value	$ 3,691	$ 4,259		3,691			$ 4,259
Investment, Identifier [Axis]: Sure Fit Home Products, LLC First Lien Secured Term Loan
Investments in and Advances to Affiliates [Line Items]
Cost of investment		$ 4,828					$ 4,828
Schedule of investments in and advances to affiliated and controlled persons
Issuer name							whf:SureFitHomeProductsLLCMember	whf:SureFitHomeProductsLLCMember
Investment type		whf:FirstLienSecuredTermLoanMember					whf:FirstLienSecuredTermLoanMember
Beginning Fair Value				4,372
Ending Fair Value		$ 4,372					$ 4,372
Investment, Identifier [Axis]: TOUR Intermediate Holdings, LLC, First Lien Secured Delayed Draw Loan, Floor 1.00%, Spread L plus 6.50%, Rate 7.50%, Due 5/15/2025
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 2,493	$ 2,600		$ 2,493			$ 2,600
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:TOURIntermediateHoldingsLLCMember	whf:TOURIntermediateHoldingsLLCMember		whf:TOURIntermediateHoldingsLLCMember	whf:TOURIntermediateHoldingsLLCMember
Investment type	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember		whf:FirstLienSecuredDelayedDrawLoanMember			whf:FirstLienSecuredDelayedDrawLoanMember
Beginning Fair Value				$ 2,616
Ending Fair Value	$ 2,505	$ 2,616		2,505			$ 2,616
Investment, Identifier [Axis]: TOUR Intermediate Holdings, LLC, First Lien Secured Term Loan, Floor 1.00%, Spread L plus 6.50%, Rate 7.50%, Due 5/15/2025
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 3,150	$ 7,343		$ 3,150			$ 7,343
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:TOURIntermediateHoldingsLLCMember	whf:TOURIntermediateHoldingsLLCMember		whf:TOURIntermediateHoldingsLLCMember	whf:TOURIntermediateHoldingsLLCMember
Investment type	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Beginning Fair Value				$ 7,438
Ending Fair Value	$ 3,182	$ 7,438		3,182			$ 7,438
Investment, Identifier [Axis]: Team Car Care Holdings, First Lien Secured Term Loan
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 14,532	$ 15,193		$ 14,532			$ 15,193
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:TeamCarCareHoldingsLLCMember	whf:TeamCarCareHoldingsLLCMember		whf:TeamCarCareHoldingsLLCMember	whf:TeamCarCareHoldingsLLCMember
Investment type	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Beginning Fair Value				$ 15,286
Ending Fair Value	$ 14,594	$ 15,286		$ 14,594			$ 15,286
Investment, Identifier [Axis]: Telestream Holdings Corporation First Lien Secured Delayed Draw Loan
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				Telestream Holdings Corporation	Telestream Holdings Corporation
Investment type	whf:FirstLienSecuredDelayedDrawLoanMember			whf:FirstLienSecuredDelayedDrawLoanMember
Investment, Identifier [Axis]: Telestream Holdings Corporation First Lien Secured Revolving Loan
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 909	$ 517		$ 909			$ 517
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				Telestream Holdings Corporation	Telestream Holdings Corporation		Telestream Holdings Corporation	Telestream Holdings Corporation
Investment type	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember		whf:FirstLienSecuredRevolvingLoanMember			whf:FirstLienSecuredRevolvingLoanMember
Beginning Fair Value				$ 549
Ending Fair Value	$ 935	$ 549		935			$ 549
Investment, Identifier [Axis]: Telestream Holdings Corporation First Lien Secured Term Loan
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 15,570	$ 14,713		$ 15,570			$ 14,713
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				Telestream Holdings Corporation	Telestream Holdings Corporation		Telestream Holdings Corporation	Telestream Holdings Corporation
Investment type	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Beginning Fair Value				$ 15,079
Ending Fair Value	$ 15,874	$ 15,079		15,874			$ 15,079
Investment, Identifier [Axis]: Tensar Corporation First Lien Secured Term Loan
Investments in and Advances to Affiliates [Line Items]
Cost of investment		$ 6,797					$ 6,797
Schedule of investments in and advances to affiliated and controlled persons
Issuer name							whf:TensarCorporationMember	whf:TensarCorporationMember
Investment type		whf:FirstLienSecuredTermLoanMember					whf:FirstLienSecuredTermLoanMember
Beginning Fair Value				7,069
Ending Fair Value		$ 7,069					$ 7,069
Investment, Identifier [Axis]: Tensar Corporation, First Lien Secured Term Loan, Floor 1.00%, Spread L plus 6.75%, Rate 7.75%, Due 8/20/2025
Investments in and Advances to Affiliates [Line Items]
Cost of investment		$ 6,797					$ 6,797
Schedule of investments in and advances to affiliated and controlled persons
Issuer name							whf:TensarCorporationMember	whf:TensarCorporationMember
Investment type		whf:FirstLienSecuredTermLoanMember					whf:FirstLienSecuredTermLoanMember
Beginning Fair Value				7,069
Ending Fair Value		$ 7,069					$ 7,069
Investment, Identifier [Axis]: The Kyjen Company, LLC First Lien Secured Revolving Loan
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 669	$ 380		$ 669			$ 380
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:TheKyjenCompanyLLCMember	whf:TheKyjenCompanyLLCMember		whf:TheKyjenCompanyLLCMember	whf:TheKyjenCompanyLLCMember
Investment type	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember		whf:FirstLienSecuredRevolvingLoanMember			whf:FirstLienSecuredRevolvingLoanMember
Beginning Fair Value				$ 390
Ending Fair Value	$ 632	$ 390		632			$ 390
Investment, Identifier [Axis]: The Kyjen Company, LLC First Lien Secured Term Loan
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 11,228	$ 11,257		$ 11,228			$ 11,257
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:TheKyjenCompanyLLCMember	whf:TheKyjenCompanyLLCMember		whf:TheKyjenCompanyLLCMember	whf:TheKyjenCompanyLLCMember
Investment type	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Beginning Fair Value				$ 11,383
Ending Fair Value	$ 10,782	$ 11,383		10,782			$ 11,383
Investment, Identifier [Axis]: Token Buyer, Inc First Lien Secured Term Loan
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 6,040			$ 6,040
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:TokenBuyerIncMember	whf:TokenBuyerIncMember
Investment type	whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Ending Fair Value	$ 6,003			$ 6,003
Investment, Identifier [Axis]: Trimlite Buyer LLC First Lien Secured Revolving Loan
Investments in and Advances to Affiliates [Line Items]
Cost of investment		$ 161					$ 161
Schedule of investments in and advances to affiliated and controlled persons
Issuer name							whf:TrimliteBuyerLLCMember	whf:TrimliteBuyerLLCMember
Investment type		whf:FirstLienSecuredRevolvingLoanMember					whf:FirstLienSecuredRevolvingLoanMember
Beginning Fair Value				161
Ending Fair Value		$ 161					$ 161
Investment, Identifier [Axis]: Trimlite Buyer LLC First Lien Secured Term Loan
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 17,681	$ 17,975		$ 17,681			$ 17,975
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:TrimliteBuyerLLCMember	whf:TrimliteBuyerLLCMember		whf:TrimliteBuyerLLCMember	whf:TrimliteBuyerLLCMember
Investment type	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Beginning Fair Value				$ 17,841
Ending Fair Value	$ 16,175	$ 17,841		16,175			$ 17,841
Investment, Identifier [Axis]: True Blue Car Wash, LLC First Lien Secured Delayed Draw Loan
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 4,124	$ 3,073		$ 4,124			$ 3,073
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:TrueBlueCarWashLLCMember	whf:TrueBlueCarWashLLCMember		whf:TrueBlueCarWashLLCMember	whf:TrueBlueCarWashLLCMember
Investment type	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember		whf:FirstLienSecuredDelayedDrawLoanMember			whf:FirstLienSecuredDelayedDrawLoanMember
Beginning Fair Value				$ 3,098
Ending Fair Value	$ 4,103	$ 3,098		4,103			$ 3,098
Investment, Identifier [Axis]: True Blue Car Wash, LLC First Lien Secured Term Loan
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 9,876	$ 8,087		$ 9,876			$ 8,087
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:TrueBlueCarWashLLCMember	whf:TrueBlueCarWashLLCMember		whf:TrueBlueCarWashLLCMember	whf:TrueBlueCarWashLLCMember
Investment type	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Beginning Fair Value				$ 8,130
Ending Fair Value	$ 9,898	$ 8,130		9,898			$ 8,130
Investment, Identifier [Axis]: Turnberry Solutions, Inc., First Lien Secured Revolving Loan, Floor 3.25%, Spread P plus 5.00%, Rate 8.25%, Due 9/2/2026
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 21	$ 84		$ 21			$ 84
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:TurnberrySolutionsInc.Member	whf:TurnberrySolutionsInc.Member		whf:TurnberrySolutionsInc.Member	whf:TurnberrySolutionsInc.Member
Investment type	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember		whf:FirstLienSecuredRevolvingLoanMember			whf:FirstLienSecuredRevolvingLoanMember
Beginning Fair Value				$ 85
Ending Fair Value	$ 17	$ 85		17			$ 85
Investment, Identifier [Axis]: Turnberry Solutions, Inc., First Lien Secured Term Loan, Floor 1.00%, Spread L plus 6.00%, Rate 7.00%, Due 9/2/2026
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 6,008	$ 5,689		$ 6,008			$ 5,689
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:TurnberrySolutionsInc.Member	whf:TurnberrySolutionsInc.Member		whf:TurnberrySolutionsInc.Member	whf:TurnberrySolutionsInc.Member
Investment type	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Beginning Fair Value				$ 5,684
Ending Fair Value	$ 5,973	$ 5,684		5,973			$ 5,684
Investment, Identifier [Axis]: Unleashed Brands, LLC, First Lien Secured Delayed Draw Loan, Floor 1.00%, Spread L plus 6.56%, Rate 7.17%, Due 11/19/2026
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 5,091	$ 5,083		$ 5,091			$ 5,083
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:UnleashedBrandsLLCMember	whf:UnleashedBrandsLLCMember		whf:UnleashedBrandsLLCMember	whf:UnleashedBrandsLLCMember
Investment type	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember		whf:FirstLienSecuredDelayedDrawLoanMember			whf:FirstLienSecuredDelayedDrawLoanMember
Beginning Fair Value				$ 5,082
Ending Fair Value	$ 5,151	$ 5,082		$ 5,151			$ 5,082
Investment, Identifier [Axis]: Unleashed Brands, LLC, First Lien Secured Revolving Loan, Floor 1.00%, Spread L plus 6.56%, Rate 7.17%, Due 11/19/2026
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:UnleashedBrandsLLCMember	whf:UnleashedBrandsLLCMember		whf:UnleashedBrandsLLCMember	whf:UnleashedBrandsLLCMember
Investment type	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember		whf:FirstLienSecuredRevolvingLoanMember			whf:FirstLienSecuredRevolvingLoanMember
Ending Fair Value	$ 6			$ 6
Investment, Identifier [Axis]: Unleashed Brands, LLC, First lien Secured Term Loan, Floor 1.00%, Spread L plus 5.50%, Rate 7.17%, Due 11/19/2026
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 3,854	$ 3,848		$ 3,854			$ 3,848
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:UnleashedBrandsLLCMember	whf:UnleashedBrandsLLCMember		whf:UnleashedBrandsLLCMember	whf:UnleashedBrandsLLCMember
Investment type	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Beginning Fair Value				$ 3,848
Ending Fair Value	$ 3,887	$ 3,848		$ 3,887			$ 3,848
Investment, Identifier [Axis]: WH Lessor Corp., First Lien Secured Revolving Loan, Floor 1.00%, Spread L plus 6.00%, Rate 7.00%, Due 12/26/2024
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:JuniperLandscapingHoldingsLLCMember	whf:JuniperLandscapingHoldingsLLCMember		whf:WHLessorCorpMember	whf:WHLessorCorpMember
Investment type	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember		whf:FirstLienSecuredRevolvingLoanMember			whf:FirstLienSecuredRevolvingLoanMember
Beginning Fair Value				$ 6
Ending Fair Value	$ 5	$ 6		5			$ 6
Investment, Identifier [Axis]: WH Lessor Corp., First Lien Secured Term Loan, Floor 1.00%, Spread L plus 6.00%, Rate 7.00%, Due 12/26/2024
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 7,412	$ 6,780		$ 7,412			$ 6,780
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:JuniperLandscapingHoldingsLLCMember	whf:JuniperLandscapingHoldingsLLCMember		whf:WHLessorCorpMember	whf:WHLessorCorpMember
Investment type	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Beginning Fair Value				$ 6,866
Ending Fair Value	$ 7,489	$ 6,866		$ 7,489			$ 6,866
Investment, Identifier [Axis]: WHF STRS Ohio Senior Loan Fund LLC Equity
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:WHFSTRSOhioSeniorLoanFundLLCMember	whf:WHFSTRSOhioSeniorLoanFundLLCMember		whf:WHFSTRSOhioSeniorLoanFundLLCMember	whf:WHFSTRSOhioSeniorLoanFundLLCMember
Investment type	Equity (excluding STRS JV)	Equity (excluding STRS JV)		Equity (excluding STRS JV)			Equity (excluding STRS JV)
Dividends and interest included in income				$ 5,042			$ 4,907
Beginning Fair Value				15,607		10,167	10,167
Purchases				5,000			4,732
Net Change in Unrealized Appreciation (Depreciation)				1,459			708
Ending Fair Value	$ 22,066	$ 15,607		22,066			15,607
Investment, Identifier [Axis]: WHF STRS Ohio Senior Loan Fund LLC Interests
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 20,000	$ 15,000		$ 20,000			$ 15,000
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:WHFSTRSOhioSeniorLoanFundMember	whf:WHFSTRSOhioSeniorLoanFundMember		whf:WHFSTRSOhioSeniorLoanFundMember	whf:WHFSTRSOhioSeniorLoanFundMember
Investment type	whf:LLCInterestsMember	whf:LLCInterestsMember		whf:LLCInterestsMember			whf:LLCInterestsMember
Beginning Fair Value				$ 15,607
Ending Fair Value	$ 22,066	$ 15,607		22,066			$ 15,607
Investment, Identifier [Axis]: WHF STRS Ohio Senior Loan Fund LLC Subordinated Note
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 80,000	$ 60,000		$ 80,000			$ 60,000
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:WHFSTRSOhioSeniorLoanFundLLCMember	whf:WHFSTRSOhioSeniorLoanFundLLCMember		whf:WHFSTRSOhioSeniorLoanFundLLCMember	whf:WHFSTRSOhioSeniorLoanFundLLCMember
Investment type	Subordinated Notes	Subordinated Notes		Subordinated Notes			Subordinated Notes
Dividends and interest included in income				$ 4,339			$ 3,307
Beginning Fair Value				60,000		$ 41,073	41,073
Purchases				20,000			18,927
Ending Fair Value	$ 80,000	$ 60,000		80,000			60,000
Investment, Identifier [Axis]: Westrock Coffee Company, LLC, First Lien Secured Term Loan, Floor 1.50%, Spread L plus 8.50%, Rate Westrock Coffee Company, LLC, Due 2/28/2025
Investments in and Advances to Affiliates [Line Items]
Cost of investment		$ 9,033					$ 9,033
Schedule of investments in and advances to affiliated and controlled persons
Issuer name							whf:WestrockCoffeeCompanyLLCMember	whf:WestrockCoffeeCompanyLLCMember
Investment type		whf:FirstLienSecuredTermLoanMember					whf:FirstLienSecuredTermLoanMember
Beginning Fair Value				8,923
Ending Fair Value		$ 8,923					$ 8,923
Investment, Identifier [Axis]: What If Holdings, LLC First Lien Secured Term Loan
Investments in and Advances to Affiliates [Line Items]
Cost of investment		$ 18,609					$ 18,609
Schedule of investments in and advances to affiliated and controlled persons
Issuer name							whf:WhatIfHoldingsLLCMember	whf:WhatIfHoldingsLLCMember
Investment type		whf:FirstLienSecuredTermLoanMember					whf:FirstLienSecuredTermLoanMember
Beginning Fair Value				18,759
Ending Fair Value		$ 18,759					$ 18,759
Investment, Identifier [Axis]: What If Media Group, LLC Common Units
Investments in and Advances to Affiliates [Line Items]
Cost of investment	$ 851	$ 850		$ 851			$ 850
Schedule of investments in and advances to affiliated and controlled persons
Issuer name				whf:WhatIfMediaGroupLLCMember	whf:WhatIfMediaGroupLLCMember		whf:WhatIfMediaGroupLLCMember	whf:WhatIfMediaGroupLLCMember
Investment type	whf:CommonUnitsMember	whf:CommonUnitsMember		whf:CommonUnitsMember			whf:CommonUnitsMember
Beginning Fair Value				$ 1,398
Ending Fair Value	$ 2,327	$ 1,398		$ 2,327			$ 1,398

INVESTMENTS - WHF STRS Ohio Sen

INVESTMENTS - WHF STRS Ohio Senior Loan Fund LLC (Details) $ in Thousands			1 Months Ended	9 Months Ended	12 Months Ended
	Mar. 11, 2022 USD ($)	Jul. 15, 2021	Jul. 31, 2019	Sep. 30, 2022 USD ($) company	Dec. 31, 2021 USD ($)	Mar. 10, 2022 USD ($)	Feb. 28, 2022 USD ($)	Jan. 27, 2021 USD ($)	Jul. 19, 2019 USD ($)	Jan. 14, 2019 USD ($)
Schedule of Investments [Line Items]
Investments				$ 764,554	$ 819,208
Cost of investment				773,406	831,960
Available				88,899	43,363
Amortized Cost, credit facility				430,992	475,958
LIBOR or SOFR | Minimum [Member]
Schedule of Investments [Line Items]
Term of interest			3 years
LIBOR or SOFR | Maximum [Member]
Schedule of Investments [Line Items]
Term of interest			6 years
Subordinated Notes
Schedule of Investments [Line Items]
Investments				167	167
Cost of investment				167	167
Equity (excluding STRS JV)
Schedule of Investments [Line Items]
Investments				48,059	38,159
Cost of investment				$ 46,193	$ 36,991
STRS JV
Schedule of Investments [Line Items]
Combined investment commitment in joint venture										$ 125,000
Investment commitment in joint venture							$ 100,000			75,000
Increase in investment commitment in joint venture							$ 25,000
Economic ownership (as a percent)				66.67%	60%		66.67%
Investments				$ 306,392	$ 273,523
Portfolio companies | company				28
Largest single investment				$ 20,086	23,483
Five largest investments				77,439	83,057
STRS JV | STRS JV Credit Facility
Schedule of Investments [Line Items]
Maximum borrowing limit	$ 225,000			225,000	175,000			$ 175,000	$ 125,000
Variable interest rate (as a percent)		2.35%
Available	168,750					$ 131,250
Borrowings greater than	$ 175,000
Amortized Cost, credit facility				$ 151,127	$ 146,782
Effective interest rate (as a percent)				3.30%	2.50%
STRS JV | STRS JV Credit Facility | SOFR
Schedule of Investments [Line Items]
Variable interest rate (as a percent)	2.50%			2.50%
Borrowings greater than				$ 175,000
STRS JV | STRS JV Credit Facility | CDOR
Schedule of Investments [Line Items]
Maximum borrowing limit				$ 175,000
Variable interest rate (as a percent)				2.35%	2.35%
STRS JV | Subordinated Notes
Schedule of Investments [Line Items]
Investment commitment in joint venture							$ 80,000
Cost of investment				$ 80,000	$ 60,000
STRS JV | Equity (excluding STRS JV)
Schedule of Investments [Line Items]
Investment commitment in joint venture							$ 20,000
Cost of investment				$ 20,000	$ 15,000
STRS JV | STRS Ohio
Schedule of Investments [Line Items]
Investment commitment in joint venture										$ 50,000
Economic ownership (as a percent)				33.33%	40%		33.33%

INVESTMENTS - STRS JVs individu

INVESTMENTS - STRS JVs individual Investments (Details) £ in Thousands, $ in Thousands, $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2022 USD ($)	Dec. 31, 2021 USD ($)	Sep. 30, 2022 CAD ($)	Sep. 30, 2022 GBP (£)	Dec. 31, 2021 CAD ($)	Dec. 31, 2020 USD ($)
Schedule of Investments [Line Items]
Investment Owned, at Cost	$ 773,406	$ 831,960
Investment Owned, at Fair Value	764,554	$ 819,208
Investment, Interest Rate, Paid in Kind		1.50%			1.50%
STRS JV
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]		whf:LINCSystemsLLCMember
Investment Owned, at Cost	285,614	$ 260,472
Investment Owned, at Fair Value	$ 280,877	$ 259,510
Investment, Interest Rate, Paid in Kind		7%			7%
Debt Investments
Schedule of Investments [Line Items]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment Owned, at Cost	$ 727,213	$ 794,969
Investment Owned, at Fair Value	$ 716,495	$ 781,049
Advertising
Schedule of Investments [Line Items]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment Owned, at Cost	$ 9,763
Investment Owned, at Fair Value	$ 9,782
Advertising | Debt Investments
Schedule of Investments [Line Items]
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment Owned, at Cost		$ 9,490
Investment Owned, at Fair Value		$ 9,488
Air Freight & Logistics
Schedule of Investments [Line Items]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment Owned, at Cost	$ 3,531
Investment Owned, at Fair Value	$ 3,557
Air Freight & Logistics | Debt Investments
Schedule of Investments [Line Items]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment Owned, at Cost	$ 15,655	$ 20,021
Investment Owned, at Fair Value	$ 15,440	$ 20,129
Application Software
Schedule of Investments [Line Items]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment Owned, at Cost	$ 13,183	$ 13,247
Investment Owned, at Fair Value	$ 13,411	$ 13,518
Application Software | Debt Investments
Schedule of Investments [Line Items]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment Owned, at Cost	$ 20,674	$ 22,460
Investment Owned, at Fair Value	$ 18,145	$ 22,590
Building Products
Schedule of Investments [Line Items]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment Owned, at Cost	$ 14,125	$ 16,441
Investment Owned, at Fair Value	$ 14,305	$ 16,603
Building Products | Debt Investments
Schedule of Investments [Line Items]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment Owned, at Cost	$ 26,714	$ 43,653
Investment Owned, at Fair Value	$ 24,714	$ 43,757
Construction & Engineering
Schedule of Investments [Line Items]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment Owned, at Cost	$ 8,534	$ 13,626
Investment Owned, at Fair Value	$ 8,625	$ 13,975
Construction & Engineering | Debt Investments
Schedule of Investments [Line Items]
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment Owned, at Cost		$ 10,814
Investment Owned, at Fair Value		$ 11,086
Data Processing & Outsourced Services
Schedule of Investments [Line Items]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment Owned, at Cost	$ 15,497	$ 15,766
Investment Owned, at Fair Value	$ 14,507	$ 16,160
Data Processing & Outsourced Services | Debt Investments
Schedule of Investments [Line Items]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment Owned, at Cost	$ 39,673	$ 31,301
Investment Owned, at Fair Value	$ 41,019	$ 31,971
Diversified Support Services
Schedule of Investments [Line Items]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment Owned, at Cost	$ 12,302	$ 12,773
Investment Owned, at Fair Value	$ 11,741	$ 10,489
Diversified Support Services | Debt Investments
Schedule of Investments [Line Items]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment Owned, at Cost	$ 11,264	$ 11,459
Investment Owned, at Fair Value	$ 11,165	$ 11,460
Electronic Equipment & Instruments
Schedule of Investments [Line Items]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment Owned, at Cost	$ 13,564	$ 6,680
Investment Owned, at Fair Value	$ 13,485	$ 6,687
Electronic Equipment & Instruments | Debt Investments
Schedule of Investments [Line Items]
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment Owned, at Cost		$ 6,684
Investment Owned, at Fair Value		$ 6,687
Environmental & Facilities Services
Schedule of Investments [Line Items]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment Owned, at Cost	$ 18,577	$ 6,780
Investment Owned, at Fair Value	$ 18,641	$ 6,872
Environmental & Facilities Services | Debt Investments
Schedule of Investments [Line Items]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment Owned, at Cost	$ 18,251	$ 32,174
Investment Owned, at Fair Value	$ 18,108	$ 32,173
Household Appliances
Schedule of Investments [Line Items]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment Owned, at Cost	$ 8,325
Investment Owned, at Fair Value	$ 7,773
Household Appliances | Debt Investments
Schedule of Investments [Line Items]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment Owned, at Cost	$ 6,040
Investment Owned, at Fair Value	$ 6,003
Industrial Machinery
Schedule of Investments [Line Items]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment Owned, at Cost	$ 15,168	$ 6,727
Investment Owned, at Fair Value	$ 15,276	$ 6,815
Industrial Machinery | Debt Investments
Schedule of Investments [Line Items]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment Owned, at Cost	$ 7,521
Investment Owned, at Fair Value	$ 7,541
Internet & Direct Marketing Retail
Schedule of Investments [Line Items]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment Owned, at Cost	$ 18,901	$ 15,153
Investment Owned, at Fair Value	$ 19,114	$ 15,353
Internet & Direct Marketing Retail | Debt Investments
Schedule of Investments [Line Items]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment Owned, at Cost	$ 37,285	$ 41,910
Investment Owned, at Fair Value	$ 37,542	$ 42,440
Investment Banking & Brokerage
Schedule of Investments [Line Items]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment Owned, at Cost	$ 5,643	$ 9,943
Investment Owned, at Fair Value	$ 5,687	$ 10,054
Investment Banking & Brokerage | Debt Investments
Schedule of Investments [Line Items]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment Owned, at Cost	$ 12,043	$ 12,674
Investment Owned, at Fair Value	$ 12,077	$ 12,729
IT Consulting And Other Services
Schedule of Investments [Line Items]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment Owned, at Cost	$ 34,933	$ 40,384
Investment Owned, at Fair Value	$ 33,342	$ 40,697
IT Consulting And Other Services | Debt Investments
Schedule of Investments [Line Items]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment Owned, at Cost	$ 13,649	$ 17,679
Investment Owned, at Fair Value	$ 13,653	$ 17,694
Leisure Products
Schedule of Investments [Line Items]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment Owned, at Cost	$ 8,945	$ 8,931
Investment Owned, at Fair Value	$ 9,044	$ 8,930
Leisure Products | Debt Investments
Schedule of Investments [Line Items]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment Owned, at Cost	$ 3,565	$ 6,115
Investment Owned, at Fair Value	$ 3,509	$ 3,072
Packaged Foods & Meats
Schedule of Investments [Line Items]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment Owned, at Cost	$ 12,297	$ 26,802
Investment Owned, at Fair Value	$ 11,998	$ 25,606
Packaged Foods & Meats | Debt Investments
Schedule of Investments [Line Items]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment Owned, at Cost	$ 11,175	$ 11,084
Investment Owned, at Fair Value	$ 10,922	$ 10,862
Personal Products
Schedule of Investments [Line Items]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment Owned, at Cost	$ 3,639	$ 4,185
Investment Owned, at Fair Value	$ 3,698	$ 4,273
Personal Products | Debt Investments
Schedule of Investments [Line Items]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment Owned, at Cost	$ 13,703	$ 12,055
Investment Owned, at Fair Value	$ 13,566	$ 12,260
Pharmaceuticals
Schedule of Investments [Line Items]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment Owned, at Cost	$ 15,512	$ 14,955
Investment Owned, at Fair Value	$ 13,706	$ 15,061
Real Estate Operating Companies
Schedule of Investments [Line Items]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment Owned, at Cost	$ 10,777	$ 4,781
Investment Owned, at Fair Value	$ 10,722	$ 4,780
Real Estate Operating Companies | Debt Investments
Schedule of Investments [Line Items]
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment Owned, at Cost		$ 5,425
Investment Owned, at Fair Value		$ 5,431
Real Estate Services
Schedule of Investments [Line Items]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment Owned, at Cost	$ 8,791
Investment Owned, at Fair Value	$ 8,572
Research & Consulting Services
Schedule of Investments [Line Items]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment Owned, at Cost	$ 8,799	$ 8,852
Investment Owned, at Fair Value	$ 8,832	$ 8,901
Research & Consulting Services | Debt Investments
Schedule of Investments [Line Items]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment Owned, at Cost	$ 22,244	$ 23,987
Investment Owned, at Fair Value	$ 22,316	$ 23,822
Systems Software
Schedule of Investments [Line Items]
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment Owned, at Cost		$ 9,801
Investment Owned, at Fair Value		$ 9,898
Systems Software | Debt Investments
Schedule of Investments [Line Items]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment Owned, at Cost	$ 18,970	$ 19,018
Investment Owned, at Fair Value	$ 17,525	$ 19,160
Technology Hardware, Storage & Peripherals
Schedule of Investments [Line Items]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment Owned, at Cost	$ 14,899	$ 14,694
Investment Owned, at Fair Value	$ 14,991	$ 14,725
Technology Hardware, Storage & Peripherals | Debt Investments
Schedule of Investments [Line Items]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment Owned, at Cost	$ 16,479	$ 22,717
Investment Owned, at Fair Value	$ 16,809	$ 23,117
Trading Companies & Distributors
Schedule of Investments [Line Items]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment Owned, at Cost	$ 9,909	$ 9,951
Investment Owned, at Fair Value	$ 10,068	$ 10,113
Investment, Identifier [Axis]: ABB/Con-cise Optical Group LLC First Lien Secured Revolving Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:ABBCon-ciseOpticalGroupLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember		whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Health Care Supplies [Member]		Health Care Supplies [Member]	Health Care Supplies [Member]
Investment, Variable Interest Rate, Type [Extensible Enumeration]	us-gaap:BaseRateMember		us-gaap:BaseRateMember	us-gaap:BaseRateMember
Investment, Interest Rate, Floor	0.75%		0.75%	0.75%
Investment, Basis Spread, Variable Rate	6.51%		6.51%	6.51%
Investment Interest Rate	12.72%		12.72%	12.72%
Investment, Acquisition Date	Feb. 23, 2022
Investment Maturity Date	Feb. 23, 2028		Feb. 23, 2028	Feb. 23, 2028
Investment Owned, Balance, Principal Amount	$ 2,106
Investment Owned, at Cost	2,058
Investment Owned, at Fair Value	$ 2,073
Investment, Identifier [Axis]: ABB/Con-cise Optical Group LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:ABBCon-ciseOpticalGroupLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Health Care Supplies [Member]		Health Care Supplies [Member]	Health Care Supplies [Member]
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]		London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor	0.75%		0.75%	0.75%
Investment, Basis Spread, Variable Rate	7.50%		7.50%	7.50%
Investment Interest Rate	10.46%		10.46%	10.46%
Investment, Acquisition Date	Feb. 23, 2022
Investment Maturity Date	Feb. 23, 2028		Feb. 23, 2028	Feb. 23, 2028
Investment Owned, Balance, Principal Amount	$ 21,627
Investment Owned, at Cost	21,141
Investment Owned, at Fair Value	$ 21,281
Investment, Identifier [Axis]: ALM Media, LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:ALMMediaLLCMember	whf:ALMMediaLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Research & Consulting Services	Research & Consulting Services	Research & Consulting Services	Research & Consulting Services	Research & Consulting Services
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor	1%	1%	1%	1%	1%
Investment, Basis Spread, Variable Rate	6.50%	7%	6.50%	6.50%	7%
Investment Interest Rate	9.31%	8%	9.31%	9.31%	8%
Investment, Acquisition Date	Nov. 25, 2019	Nov. 25, 2019
Investment Maturity Date	Nov. 25, 2024	Nov. 25, 2024	Nov. 25, 2024	Nov. 25, 2024	Nov. 25, 2024
Investment Owned, Balance, Principal Amount	$ 13,584	$ 14,175
Investment Owned, at Cost	13,467	14,011
Investment Owned, at Fair Value	$ 13,458	$ 13,996
Investment, Interest Rate, Paid in Kind		1%			1%
Investment, Interest Rate, Paid in Cash		10.25%			10.25%
Investment, Identifier [Axis]: AST Applications Software Technology LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]		whf:ASTApplicationsSoftwareTechnologyLLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		IT Consulting And Other Services			IT Consulting And Other Services
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor		1%			1%
Investment, Basis Spread, Variable Rate		8%			8%
Investment Interest Rate		9%			9%
Investment, Acquisition Date		Jan. 10, 2017
Investment Maturity Date		Jan. 10, 2023			Jan. 10, 2023
Investment Owned, Balance, Principal Amount		$ 3,958
Investment Owned, at Cost		3,943
Investment Owned, at Fair Value		$ 3,958
Investment, Interest Rate, Paid in Kind		1%			1%
Investment, Interest Rate, Paid in Cash		8%			8%
Investment, Identifier [Axis]: ATSG Inc First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:ATSGIncMember	whf:ATSGIncMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	IT Consulting And Other Services	IT Consulting And Other Services	IT Consulting And Other Services	IT Consulting And Other Services	IT Consulting And Other Services
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor	1%	1%	1%	1%	1%
Investment, Basis Spread, Variable Rate	6.50%	6.50%	6.50%	6.50%	6.50%
Investment Interest Rate	9.42%	7.50%	9.42%	9.42%	7.50%
Investment, Acquisition Date	Nov. 12, 2021	Nov. 12, 2021
Investment Maturity Date	Nov. 12, 2026	Nov. 12, 2026	Nov. 12, 2026	Nov. 12, 2026	Nov. 12, 2026
Investment Owned, Balance, Principal Amount	$ 13,877	$ 14,008
Investment Owned, at Cost	13,649	13,736
Investment Owned, at Fair Value	$ 13,653	$ 13,736
Investment, Identifier [Axis]: Access USA Shipping, LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:AccessUSAShippingLLCMember	whf:AccessUSAShippingLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Air Freight & Logistics	Air Freight & Logistics	Air Freight & Logistics	Air Freight & Logistics	Air Freight & Logistics
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor	1.50%	1.50%	1.50%	1.50%	1.50%
Investment, Basis Spread, Variable Rate	8%	8%	8%	8%	8%
Investment Interest Rate	11.12%	9.50%	11.12%	11.12%	9.50%
Investment, Acquisition Date	Feb. 08, 2019	Feb. 08, 2019
Investment Maturity Date	Feb. 08, 2024	Feb. 08, 2024	Feb. 08, 2024	Feb. 08, 2024	Feb. 08, 2024
Investment Owned, Balance, Principal Amount	$ 4,718	$ 4,937
Investment Owned, at Cost	4,699	4,906
Investment Owned, at Fair Value	$ 4,718	$ 4,937
Investment, Identifier [Axis]: Aeyon LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:AeyonLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Research & Consulting Services		Research & Consulting Services	Research & Consulting Services
Investment, Variable Interest Rate, Type [Extensible Enumeration]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]		Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
Investment, Interest Rate, Floor	1%		1%	1%
Investment, Basis Spread, Variable Rate	8.88%		8.88%	8.88%
Investment Interest Rate	11.62%		11.62%	11.62%
Investment, Acquisition Date	Feb. 10, 2022
Investment Maturity Date	Feb. 10, 2027		Feb. 10, 2027	Feb. 10, 2027
Investment Owned, Balance, Principal Amount	$ 8,933
Investment Owned, at Cost	8,777
Investment Owned, at Fair Value	$ 8,858
Investment, Identifier [Axis]: American Crafts, LC First Lien Secured Delayed Draw Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:AmericanCraftsLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredDelayedDrawLoanMember		whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Office Services And Supplies [Member]		Office Services And Supplies [Member]	Office Services And Supplies [Member]
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]		London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor	1%		1%	1%
Investment, Basis Spread, Variable Rate	8.50%		8.50%	8.50%
Investment Interest Rate	11.62%		11.62%	11.62%
Investment, Acquisition Date	Jan. 25, 2022
Investment Maturity Date	May 28, 2026		May 28, 2026	May 28, 2026
Investment Owned, Balance, Principal Amount	$ 1,367
Investment Owned, at Cost	1,344
Investment Owned, at Fair Value	$ 1,195
Investment, Identifier [Axis]: American Crafts, LC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:AmericanCraftsLCMember	whf:AmericanCraftsLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Office Services And Supplies [Member]	Office Services And Supplies [Member]	Office Services And Supplies [Member]	Office Services And Supplies [Member]	Office Services And Supplies [Member]
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor	1%	1%	1%	1%	1%
Investment, Basis Spread, Variable Rate	8.50%	8.50%	8.50%	8.50%	8.50%
Investment Interest Rate	11.62%	9.50%	11.62%	11.62%	9.50%
Investment, Acquisition Date	May 28, 2021	May 28, 2021
Investment Maturity Date	May 28, 2026	May 28, 2026	May 28, 2026	May 28, 2026	May 28, 2026
Investment Owned, Balance, Principal Amount	$ 8,139	$ 8,434
Investment Owned, at Cost	8,050	8,325
Investment Owned, at Fair Value	$ 7,114	$ 8,325
Investment, Identifier [Axis]: Arcole Holding Corporation Shares
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:ArcoleHoldingCorporationMember	whf:ArcoleHoldingCorporationMember
Investment, Type [Extensible Enumeration]	Common Stock [Member]	Common Stock [Member]	Common Stock [Member]	Common Stock [Member]	Common Stock [Member]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Investment Banking & Brokerage	Investment Banking & Brokerage	Investment Banking & Brokerage	Investment Banking & Brokerage	Investment Banking & Brokerage
Investment, Acquisition Date	Oct. 01, 2020	Oct. 01, 2020
Investment Owned, at Cost	$ 6,944	$ 6,944
Investment Owned, at Fair Value	$ 6,295	$ 6,874				$ 6,448
Investment, Identifier [Axis]: Arcstor Midco, LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:ArcstorMidcoLLCMember	whf:ArcstorMidcoLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Systems Software	Systems Software	Systems Software	Systems Software	Systems Software
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor	1%	1%	1%	1%	1%
Investment, Basis Spread, Variable Rate	7%	7%	7%	7%	7%
Investment Interest Rate	10.67%	8%	10.67%	10.67%	8%
Investment, Acquisition Date	Mar. 16, 2021	Mar. 16, 2021
Investment Maturity Date	Mar. 16, 2027	Mar. 16, 2027	Mar. 16, 2027	Mar. 16, 2027	Mar. 16, 2027
Investment Owned, Balance, Principal Amount	$ 19,256	$ 19,354
Investment Owned, at Cost	18,970	19,018
Investment Owned, at Fair Value	$ 17,525	$ 19,160
Investment, Identifier [Axis]: Atlas Purchaser, Inc First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:AtlasPurchaserIncMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Application Software		Application Software	Application Software
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]		London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor	0.75%		0.75%	0.75%
Investment, Basis Spread, Variable Rate	5.25%		5.25%	5.25%
Investment Interest Rate	8.68%		8.68%	8.68%
Investment, Acquisition Date	Aug. 29, 2022
Investment Maturity Date	May 08, 2028		May 08, 2028	May 08, 2028
Investment Owned, Balance, Principal Amount	$ 3,105
Investment Owned, at Cost	2,595
Investment Owned, at Fair Value	$ 2,562
Investment, Identifier [Axis]: Atlas Purchaser, Inc Second Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:AtlasPurchaserIncMember	whf:AtlasPurchaserIncMember
Investment, Type [Extensible Enumeration]	whf:SecondLienSecuredTermLoanMember	whf:SecondLienSecuredTermLoanMember	whf:SecondLienSecuredTermLoanMember	whf:SecondLienSecuredTermLoanMember	whf:SecondLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Application Software	Application Software	Application Software	Application Software	Application Software
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor	0.75%	0.75%	0.75%	0.75%	0.75%
Investment, Basis Spread, Variable Rate	9%	9%	9%	9%	9%
Investment Interest Rate	11.19%	9.75%	11.19%	11.19%	9.75%
Investment, Acquisition Date	May 03, 2021	May 03, 2021
Investment Maturity Date	May 07, 2029	May 07, 2029	May 07, 2029	May 07, 2029	May 07, 2029
Investment Owned, Balance, Principal Amount	$ 15,000	$ 15,000
Investment Owned, at Cost	14,628	14,586
Investment Owned, at Fair Value	$ 12,197	$ 14,700
Investment, Identifier [Axis]: Avision Holdings, LLC Class A LLC Interests
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:AvisionHoldingsLLCMember	whf:AvisionHoldingsLLCMember
Investment, Type [Extensible Enumeration]	whf:ClassALLCInterestsMember	whf:ClassALLCInterestsMember	whf:ClassALLCInterestsMember	whf:ClassALLCInterestsMember	whf:ClassALLCInterestsMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Advertising	Advertising	Advertising	Advertising	Advertising
Investment, Acquisition Date	Dec. 15, 2021	Dec. 15, 2021
Investment Owned, Balance, Principal Amount	$ 201	$ 200
Investment Owned, at Cost	251	250
Investment Owned, at Fair Value	$ 219	$ 250
Investment, Identifier [Axis]: BBQ Buyer, LLC First Lien Secured Delayed Draw Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:BBQBuyerLLCMember	whf:BBQBuyerLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Internet & Direct Marketing Retail	Internet & Direct Marketing Retail	Internet & Direct Marketing Retail	Internet & Direct Marketing Retail	Internet & Direct Marketing Retail
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor	1.50%	1.50%	1.50%	1.50%	1.50%
Investment, Basis Spread, Variable Rate	10%	10%	10%	10%	10%
Investment Interest Rate	13.12%	11.50%	13.12%	13.12%	11.50%
Investment, Acquisition Date	Apr. 29, 2022	Dec. 02, 2021
Investment Maturity Date	Aug. 28, 2025	Aug. 28, 2025	Aug. 28, 2025	Aug. 28, 2025	Aug. 28, 2025
Investment Owned, Balance, Principal Amount	$ 2,593	$ 2,573
Investment Owned, at Cost	2,553	2,523
Investment Owned, at Fair Value	$ 2,559	$ 2,523
Investment, Interest Rate, Paid in Kind	2%	2%	2%	2%	2%
Investment, Interest Rate, Paid in Cash	11.12%	9.50%	11.12%	11.12%	9.50%
Investment, Identifier [Axis]: BBQ Buyer, LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:BBQBuyerLLCMember	whf:BBQBuyerLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Internet & Direct Marketing Retail	Internet & Direct Marketing Retail	Internet & Direct Marketing Retail	Internet & Direct Marketing Retail	Internet & Direct Marketing Retail
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor	1.50%	1.50%	1.50%	1.50%	1.50%
Investment, Basis Spread, Variable Rate	10%	10%	10%	10%	10%
Investment Interest Rate	13.12%	11.50%	13.12%	13.12%	11.50%
Investment, Acquisition Date	Aug. 28, 2020	Aug. 28, 2020
Investment Maturity Date	Aug. 28, 2025	Aug. 28, 2025	Aug. 28, 2025	Aug. 28, 2025	Aug. 28, 2025
Investment Owned, Balance, Principal Amount	$ 12,719	$ 12,623
Investment Owned, at Cost	12,533	12,388
Investment Owned, at Fair Value	$ 12,616	$ 12,623
Investment, Interest Rate, Paid in Kind	2%	2%	2%	2%	2%
Investment, Interest Rate, Paid in Cash	11.12%	9.50%	11.12%	11.12%	9.50%
Investment, Identifier [Axis]: BBQ Buyer, LLC Shares
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:BBQBuyerLLCMember	whf:BBQBuyerLLCMember
Investment, Type [Extensible Enumeration]	Common Stock [Member]	Common Stock [Member]	Common Stock [Member]	Common Stock [Member]	Common Stock [Member]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Internet & Direct Marketing Retail	Internet & Direct Marketing Retail	Internet & Direct Marketing Retail	Internet & Direct Marketing Retail	Internet & Direct Marketing Retail
Investment, Acquisition Date	Aug. 28, 2020	Aug. 28, 2020
Investment Owned, Balance, Principal Amount	$ 1,100	$ 1,100
Investment Owned, at Cost	1,100	1,100
Investment Owned, at Fair Value	$ 1,954	$ 2,442
Investment, Identifier [Axis]: BL Products Parent, LP Class A Units
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:BLProductsParentLPMember
Investment, Type [Extensible Enumeration]	whf:ClassAUnitsMember		whf:ClassAUnitsMember	whf:ClassAUnitsMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Industrial Machinery		Industrial Machinery	Industrial Machinery
Investment, Acquisition Date	Feb. 01, 2022
Investment Owned, Balance, Principal Amount	$ 667
Investment Owned, at Cost	667
Investment Owned, at Fair Value	$ 668
Investment, Identifier [Axis]: BLP Buyer, Inc., First Lien Secured Revolving Loan, Floor 1.00%, Spread L plus 6.25%, Rate 7.44%, Due 2/1/27
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:BLProductsParentLPMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember		whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Industrial Machinery		Industrial Machinery	Industrial Machinery
Investment, Interest Rate, Floor	1%		1%	1%
Investment, Basis Spread, Variable Rate	6.25%		6.25%	6.25%
Investment Interest Rate	9%		9%	9%
Investment, Acquisition Date	Feb. 18, 2022
Investment Maturity Date	Feb. 01, 2027		Feb. 01, 2027	Feb. 01, 2027
Investment Owned, Balance, Principal Amount	$ 274
Investment Owned, at Cost	269
Investment Owned, at Fair Value	$ 271
Investment, Identifier [Axis]: BLP Buyer, Inc., First Lien Secured Revolving Loan, Floor 1.00%, Spread L plus 6.25%, Rate 7.54%, Due 2/1/27
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:BLProductsParentLPMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Industrial Machinery		Industrial Machinery	Industrial Machinery
Investment, Interest Rate, Floor	1%		1%	1%
Investment, Basis Spread, Variable Rate	6.25%		6.25%	6.25%
Investment Interest Rate	9.03%		9.03%	9.03%
Investment, Acquisition Date	Feb. 18, 2022
Investment Maturity Date	Feb. 01, 2027		Feb. 01, 2027	Feb. 01, 2027
Investment Owned, Balance, Principal Amount	$ 8,209
Investment Owned, at Cost	8,066
Investment Owned, at Fair Value	$ 8,080
Investment, Identifier [Axis]: BPII-JL Group Holdings LP Class A Units
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:BPII-JLGroupHoldingsLPMember	whf:BPII-JLGroupHoldingsLPMember
Investment, Type [Extensible Enumeration]	whf:ClassAUnitsMember	whf:ClassAUnitsMember	whf:ClassAUnitsMember	whf:ClassAUnitsMember	whf:ClassAUnitsMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Environmental & Facilities Services	Environmental & Facilities Services	Environmental & Facilities Services	Environmental & Facilities Services	Environmental & Facilities Services
Investment, Acquisition Date	Dec. 29, 2021	Dec. 29, 2021
Investment Owned, Balance, Principal Amount	$ 83	$ 83
Investment Owned, at Cost	825	825
Investment Owned, at Fair Value	$ 661	$ 825
Investment, Identifier [Axis]: Bridgepoint Healthcare, LLC First Lien Secured Delayed Draw Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:BridgepointHealthcareLLCMember	whf:BridgepointHealthcareLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Health Care Facilities [Member]	Health Care Facilities [Member]	Health Care Facilities [Member]	Health Care Facilities [Member]	Health Care Facilities [Member]
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor	1%	1%	1%	1%	1%
Investment, Basis Spread, Variable Rate	7.75%	7.75%	7.75%	7.75%	7.75%
Investment Interest Rate	10.51%	8.75%	10.51%	10.51%	8.75%
Investment, Acquisition Date	Oct. 05, 2021	Oct. 05, 2021
Investment Maturity Date	Oct. 05, 2026	Oct. 05, 2026	Oct. 05, 2026	Oct. 05, 2026	Oct. 05, 2026
Investment Owned, at Fair Value	$ (11)
Investment, Identifier [Axis]: Bridgepoint Healthcare, LLC First Lien Secured Revolving Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:BridgepointHealthcareLLCMember	whf:BridgepointHealthcareLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Health Care Facilities [Member]	Health Care Facilities [Member]	Health Care Facilities [Member]	Health Care Facilities [Member]	Health Care Facilities [Member]
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor	1%	1%	1%	1%	1%
Investment, Basis Spread, Variable Rate	7.75%	7.75%	7.75%	7.75%	7.75%
Investment Interest Rate	10.51%	8.75%	10.51%	10.51%	8.75%
Investment, Acquisition Date	Oct. 05, 2021	Oct. 05, 2021
Investment Maturity Date	Oct. 05, 2026	Oct. 05, 2026	Oct. 05, 2026	Oct. 05, 2026	Oct. 05, 2026
Investment Owned, at Fair Value	$ (8)
Investment, Identifier [Axis]: Bridgepoint Healthcare, LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:BridgepointHealthcareLLCMember	whf:BridgepointHealthcareLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Health Care Facilities [Member]	Health Care Facilities [Member]	Health Care Facilities [Member]	Health Care Facilities [Member]	Health Care Facilities [Member]
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor	1%	1%	1%	1%	1%
Investment, Basis Spread, Variable Rate	7.75%	7.75%	7.75%	7.75%	7.75%
Investment Interest Rate	10.51%	8.75%	10.51%	10.51%	8.75%
Investment, Acquisition Date	Oct. 05, 2021	Oct. 05, 2021
Investment Maturity Date	Oct. 05, 2026	Oct. 05, 2026	Oct. 05, 2026	Oct. 05, 2026	Oct. 05, 2026
Investment Owned, Balance, Principal Amount	$ 10,562	$ 10,979
Investment Owned, at Cost	10,392	10,770
Investment Owned, at Fair Value	$ 10,337	$ 10,769
Investment, Identifier [Axis]: Bulk Midco, LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:BulkMidcoLLCMember	whf:BulkMidcoLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Cable And Satellite [Member]	Cable And Satellite [Member]	Cable And Satellite [Member]	Cable And Satellite [Member]	Cable And Satellite [Member]
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor	1%	1%	1%	1%	1%
Investment, Basis Spread, Variable Rate	5.25%	7.24%	5.25%	5.25%	7.24%
Investment Interest Rate	11.50%	8.24%	11.50%	11.50%	8.24%
Investment, Acquisition Date	Jun. 08, 2018	Jun. 08, 2018
Investment Maturity Date	Jun. 08, 2023	Jun. 08, 2023	Jun. 08, 2023	Jun. 08, 2023	Jun. 08, 2023
Investment Owned, Balance, Principal Amount	$ 14,922	$ 15,000
Investment Owned, at Cost	14,891	14,936
Investment Owned, at Fair Value	$ 14,323	$ 14,526
Investment, Identifier [Axis]: CHS Therapy, LLC First Lien Secured Term Loan A
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:CHSTherapyLLCMember	whf:CHSTherapyLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanAMember	whf:FirstLienSecuredTermLoanAMember	whf:FirstLienSecuredTermLoanAMember	whf:FirstLienSecuredTermLoanAMember	whf:FirstLienSecuredTermLoanAMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Health Care Services [Member]	Health Care Services [Member]	Health Care Services [Member]	Health Care Services [Member]	Health Care Services [Member]
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor	1.50%	1.50%	1.50%	1.50%	1.50%
Investment, Basis Spread, Variable Rate	9%	9%	9%	9%	9%
Investment Interest Rate	12.67%	10.50%	12.67%	12.67%	10.50%
Investment, Acquisition Date	Jun. 14, 2019	Jun. 14, 2019
Investment Maturity Date	Jun. 14, 2024	Jun. 14, 2024	Jun. 14, 2024	Jun. 14, 2024	Jun. 14, 2024
Investment Owned, Balance, Principal Amount	$ 7,125	$ 7,242
Investment Owned, at Cost	7,079	7,175
Investment Owned, at Fair Value	$ 7,125	$ 7,242
Investment, Interest Rate, Paid in Kind	0.50%	0.50%	0.50%	0.50%	0.50%
Investment, Interest Rate, Paid in Cash	12.17%	10%	12.17%	12.17%	10%
Investment, Identifier [Axis]: CHS Therapy, LLC First Lien Secured Term Loan C
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:CHSTherapyLLCMember	whf:CHSTherapyLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanCMember	whf:FirstLienSecuredTermLoanCMember	whf:FirstLienSecuredTermLoanCMember	whf:FirstLienSecuredTermLoanCMember	whf:FirstLienSecuredTermLoanCMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Health Care Services [Member]	Health Care Services [Member]	Health Care Services [Member]	Health Care Services [Member]	Health Care Services [Member]
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor	1.50%	1.50%	1.50%	1.50%	1.50%
Investment, Basis Spread, Variable Rate	9%	9%	9%	9%	9%
Investment Interest Rate	12.67%	10.50%	12.67%	12.67%	10.50%
Investment, Acquisition Date	Oct. 07, 2020	Oct. 07, 2020
Investment Maturity Date	Jun. 14, 2024	Jun. 14, 2024	Jun. 14, 2024	Jun. 14, 2024	Jun. 14, 2024
Investment Owned, Balance, Principal Amount	$ 877	$ 891
Investment Owned, at Cost	869	879
Investment Owned, at Fair Value	$ 877	$ 891
Investment, Interest Rate, Paid in Kind	0.50%	0.50%	0.50%	0.50%	0.50%
Investment, Interest Rate, Paid in Cash	12.17%	10%	12.17%	12.17%	10%
Investment, Identifier [Axis]: CX Holdco LLC Common Units
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:CXHoldcoLLCMember	whf:CXHoldcoLLCMember
Investment, Type [Extensible Enumeration]	whf:CommonUnitsMember	whf:CommonUnitsMember	whf:CommonUnitsMember	whf:CommonUnitsMember	whf:CommonUnitsMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	IT Consulting And Other Services	IT Consulting And Other Services	IT Consulting And Other Services	IT Consulting And Other Services	IT Consulting And Other Services
Investment, Acquisition Date	May 04, 2021	May 04, 2021
Investment Owned, Balance, Principal Amount	$ 972	$ 972
Investment Owned, at Cost	972	972
Investment Owned, at Fair Value	$ 1,457	$ 972
Investment, Identifier [Axis]: Camp Facility Services Holdings, LLC First Lien Secured Delayed Draw Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:CampFacilityServicesHoldingsLLCMember	whf:CampFacilityServicesHoldingsLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Specialized Consumer Services [Member]	Specialized Consumer Services [Member]	Specialized Consumer Services [Member]	Specialized Consumer Services [Member]	Specialized Consumer Services [Member]
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor	1%	1%	1%	1%	1%
Investment, Basis Spread, Variable Rate	6.50%	6.50%	6.50%	6.50%	6.50%
Investment Interest Rate	9.55%	7.50%	9.55%	9.55%	7.50%
Investment, Acquisition Date	Nov. 16, 2021	Nov. 16, 2021
Investment Maturity Date	Nov. 16, 2027	Nov. 16, 2027	Nov. 16, 2027	Nov. 16, 2027	Nov. 16, 2027
Investment Owned, at Fair Value	$ (24)	$ (1)
Investment, Identifier [Axis]: Camp Facility Services Holdings, LLC First Lien Secured Revolving Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]		whf:CampFacilityServicesHoldingsLLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredRevolvingLoanMember			whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Specialized Consumer Services [Member]			Specialized Consumer Services [Member]
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor		1%			1%
Investment, Basis Spread, Variable Rate		6.50%			6.50%
Investment Interest Rate		7.50%			7.50%
Investment, Acquisition Date		Nov. 16, 2021
Investment Maturity Date		Nov. 16, 2027			Nov. 16, 2027
Investment, Identifier [Axis]: Camp Facility Services Holdings, LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:CampFacilityServicesHoldingsLLCMember	whf:CampFacilityServicesHoldingsLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Specialized Consumer Services [Member]	Specialized Consumer Services [Member]	Specialized Consumer Services [Member]	Specialized Consumer Services [Member]	Specialized Consumer Services [Member]
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor	1%	1%	1%	1%	1%
Investment, Basis Spread, Variable Rate	6.50%	6.50%	6.50%	6.50%	6.50%
Investment Interest Rate	9.55%	7.50%	9.55%	9.55%	7.50%
Investment, Acquisition Date	Nov. 16, 2021	Nov. 16, 2021
Investment Maturity Date	Nov. 16, 2027	Nov. 16, 2027	Nov. 16, 2027	Nov. 16, 2027	Nov. 16, 2027
Investment Owned, Balance, Principal Amount	$ 11,830	$ 13,000
Investment Owned, at Cost	11,628	12,745
Investment Owned, at Fair Value	$ 11,558	$ 12,742
Investment, Identifier [Axis]: Camp Facility Services Parent, LLC Preferred Units
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:CampFacilityServicesParentLLCMember	whf:CampFacilityServicesParentLLCMember
Investment, Type [Extensible Enumeration]	whf:PreferredUnitsMember	whf:PreferredUnitsMember	whf:PreferredUnitsMember	whf:PreferredUnitsMember	whf:PreferredUnitsMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Specialized Consumer Services [Member]	Specialized Consumer Services [Member]	Specialized Consumer Services [Member]	Specialized Consumer Services [Member]	Specialized Consumer Services [Member]
Investment, Basis Spread, Variable Rate	10%	10%	10%	10%	10%
Investment, Acquisition Date	Nov. 16, 2021	Nov. 16, 2021
Investment Owned, Balance, Principal Amount	$ 15	$ 15
Investment Owned, at Cost	840	840
Investment Owned, at Fair Value	$ 853	$ 840
Investment, Interest Rate, Paid in Kind	10%	10%	10%	10%	10%
Investment, Identifier [Axis]: Cennox Holdings Limited, First Lien Secured Term Loan, Floor 1.00%, Spread L plus 6.00%, Rate 7.00%, Due 5/4/2026
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:CennoxHoldingsLimitedMember	whf:CennoxHoldingsLimitedMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	IT Consulting And Other Services	IT Consulting And Other Services	IT Consulting And Other Services	IT Consulting And Other Services	IT Consulting And Other Services
Investment, Interest Rate, Floor	1%	1%	1%	1%	1%
Investment, Basis Spread, Variable Rate	6%	6%	6%	6%	6%
Investment Interest Rate	7.69%	7%	7.69%	7.69%	7%
Investment, Acquisition Date	Jul. 16, 2021	Jul. 16, 2021
Investment Maturity Date	May 04, 2026	May 04, 2026	May 04, 2026	May 04, 2026	May 04, 2026
Investment Owned, Balance, Principal Amount	$ 2,844	$ 2,866
Investment Owned, at Cost	3,868	3,889
Investment Owned, at Fair Value	$ 3,140	$ 3,877
Investment, Identifier [Axis]: Cennox Holdings Limited, First lien Secured Revolving Loan, Floor 1.00%, Spread L plus 6.00%, Rate 7.00%, Due 5/4/2026
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:CennoxHoldingsLimitedMember	whf:CennoxHoldingsLimitedMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	IT Consulting And Other Services	IT Consulting And Other Services	IT Consulting And Other Services	IT Consulting And Other Services	IT Consulting And Other Services
Investment, Interest Rate, Floor	1%	1%	1%	1%	1%
Investment, Basis Spread, Variable Rate	6.25%	6%	6.25%	6.25%	6%
Investment Interest Rate	9.78%	7%	9.78%	9.78%	7%
Investment, Acquisition Date	Jun. 28, 2022	Jul. 16, 2021
Investment Maturity Date	May 04, 2026	May 04, 2026	May 04, 2026	May 04, 2026	May 04, 2026
Investment Owned, Balance, Principal Amount	$ 9,482	$ 864
Investment Owned, at Cost	9,845	1,173
Investment Owned, at Fair Value	$ 9,205	$ 1,169
Investment, Identifier [Axis]: Cennox, Inc., First Lien Secured Delayed Draw Loan, Floor 1.00%, Spread L plus 6.00%, Rate 7.00%, Due 5/4/2026
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]		whf:CennoxInc.Member
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredDelayedDrawLoanMember			whf:FirstLienSecuredDelayedDrawLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		IT Consulting And Other Services			IT Consulting And Other Services
Investment, Interest Rate, Floor		1%			1%
Investment, Basis Spread, Variable Rate		6%			6%
Investment Interest Rate		7%			7%
Investment, Acquisition Date		Jun. 28, 2021
Investment Maturity Date		May 04, 2026			May 04, 2026
Investment Owned, Balance, Principal Amount		$ 8,915
Investment Owned, at Cost		8,755
Investment Owned, at Fair Value		$ 8,915
Investment, Identifier [Axis]: Cennox, Inc., First Lien Secured Revolving Loan, Floor 1.00%, Spread L plus 6.00%, Rate 7.00%, Due 5/4/2026
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:CennoxHoldingsLimitedMember	whf:CennoxInc.Member
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	IT Consulting And Other Services	IT Consulting And Other Services	IT Consulting And Other Services	IT Consulting And Other Services	IT Consulting And Other Services
Investment, Interest Rate, Floor	1%	1%	1%	1%	1%
Investment, Basis Spread, Variable Rate	6%	6%	6%	6%	6%
Investment Interest Rate	8.03%	7%	8.03%	8.03%	7%
Investment, Acquisition Date	Jul. 16, 2021	Jun. 28, 2021
Investment Maturity Date	May 04, 2026	May 04, 2026	May 04, 2026	May 04, 2026	May 04, 2026
Investment Owned, Balance, Principal Amount	$ 450	$ 561
Investment Owned, at Cost	680	551
Investment Owned, at Fair Value	$ 502	$ 569
Investment, Identifier [Axis]: Cennox, Inc., First Lien Secured Term Loan, Floor 1.00%, Spread L plus 6.00%, Rate 7.00%, Due 5/4/2026
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]		whf:CennoxInc.Member
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		IT Consulting And Other Services			IT Consulting And Other Services
Investment, Interest Rate, Floor		1%			1%
Investment, Basis Spread, Variable Rate		6%			6%
Investment Interest Rate		7%			7%
Investment, Acquisition Date		Jun. 28, 2021
Investment Maturity Date		May 04, 2026			May 04, 2026
Investment Owned, Balance, Principal Amount		$ 8,525
Investment Owned, at Cost		8,365
Investment Owned, at Fair Value		$ 8,438
Investment, Identifier [Axis]: Claridge Products and Equipment, LLC First Lien Secured Revolving Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:ClaridgeProductsandEquipmentLLCMember	whf:ClaridgeProductsandEquipmentLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Construction Materials [Member]	Construction Materials [Member]	Construction Materials [Member]	Construction Materials [Member]	Construction Materials [Member]
Investment, Variable Interest Rate, Type [Extensible Enumeration]	us-gaap:BaseRateMember	us-gaap:PrimeRateMember	us-gaap:BaseRateMember	us-gaap:BaseRateMember	us-gaap:PrimeRateMember
Investment, Interest Rate, Floor	1%	3.25%	1%	1%	3.25%
Investment, Basis Spread, Variable Rate	5.72%	5.50%	5.72%	5.72%	5.50%
Investment Interest Rate	11.84%	8.75%	11.84%	11.84%	8.75%
Investment, Acquisition Date	Dec. 30, 2020	Dec. 30, 2020
Investment Maturity Date	Dec. 29, 2025	Dec. 29, 2025	Dec. 29, 2025	Dec. 29, 2025	Dec. 29, 2025
Investment Owned, Balance, Principal Amount	$ 926	$ 211
Investment Owned, at Cost	918	207
Investment Owned, at Fair Value	$ 888	$ 204
Investment, Identifier [Axis]: Claridge Products and Equipment, LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:ClaridgeProductsandEquipmentLLCMember	whf:ClaridgeProductsandEquipmentLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Construction Materials [Member]	Construction Materials [Member]	Construction Materials [Member]	Construction Materials [Member]	Construction Materials [Member]
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor	1%	1%	1%	1%	1%
Investment, Basis Spread, Variable Rate	6.50%	6.50%	6.50%	6.50%	6.50%
Investment Interest Rate	10.17%	7.50%	10.17%	10.17%	7.50%
Investment, Acquisition Date	Dec. 30, 2020	Dec. 30, 2020
Investment Maturity Date	Dec. 29, 2025	Dec. 29, 2025	Dec. 29, 2025	Dec. 29, 2025	Dec. 29, 2025
Investment Owned, Balance, Principal Amount	$ 7,582	$ 7,640
Investment Owned, at Cost	7,484	7,518
Investment Owned, at Fair Value	$ 7,280	$ 7,469
Investment, Identifier [Axis]: CleanChoice Energy, Inc First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:CleanChoiceEnergyIncMember	whf:CleanChoiceEnergyIncMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Electric Utilities [Member]	Electric Utilities [Member]	Electric Utilities [Member]	Electric Utilities [Member]	Electric Utilities [Member]
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor	1%	1%	1%	1%	1%
Investment, Basis Spread, Variable Rate	7.25%	7.25%	7.25%	7.25%	7.25%
Investment Interest Rate	9.76%	8.25%	9.76%	9.76%	8.25%
Investment, Acquisition Date	Oct. 12, 2021	Oct. 12, 2021
Investment Maturity Date	Oct. 12, 2026	Oct. 12, 2026	Oct. 12, 2026	Oct. 12, 2026	Oct. 12, 2026
Investment Owned, Balance, Principal Amount	$ 10,500	$ 10,500
Investment Owned, at Cost	10,331	10,299
Investment Owned, at Fair Value	$ 10,408	$ 10,296
Investment, Identifier [Axis]: Coastal Television Broadcasting Group LLC First Lien Secured Revolving Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:CoastalTelevisionBroadcastingGroupLLCMember	whf:CoastalTelevisionBroadcastingGroupLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Broadcasting [Member]	Broadcasting [Member]	Broadcasting [Member]	Broadcasting [Member]	Broadcasting [Member]
Investment, Variable Interest Rate, Type [Extensible Enumeration]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	whf:SecuredOvernightFinancingRateMember	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	whf:SecuredOvernightFinancingRateMember
Investment, Interest Rate, Floor	1%	1%	1%	1%	1%
Investment, Basis Spread, Variable Rate	6.50%	6.50%	6.50%	6.50%	6.50%
Investment Interest Rate	9.48%	7.50%	9.48%	9.48%	7.50%
Investment, Acquisition Date	Dec. 30, 2021	Dec. 30, 2021
Investment Maturity Date	Dec. 30, 2026	Dec. 30, 2026	Dec. 30, 2026	Dec. 30, 2026	Dec. 30, 2026
Investment Owned, at Fair Value	$ (4)
Investment, Identifier [Axis]: Coastal Television Broadcasting Group LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:CoastalTelevisionBroadcastingGroupLLCMember	whf:CoastalTelevisionBroadcastingGroupLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Broadcasting [Member]	Broadcasting [Member]	Broadcasting [Member]	Broadcasting [Member]	Broadcasting [Member]
Investment, Variable Interest Rate, Type [Extensible Enumeration]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	whf:SecuredOvernightFinancingRateMember	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	whf:SecuredOvernightFinancingRateMember
Investment, Interest Rate, Floor	1%	1%	1%	1%	1%
Investment, Basis Spread, Variable Rate	6.50%	6.50%	6.50%	6.50%	6.50%
Investment Interest Rate	9.48%	7.50%	9.48%	9.48%	7.50%
Investment, Acquisition Date	Dec. 30, 2021	Dec. 30, 2021
Investment Maturity Date	Dec. 30, 2026	Dec. 30, 2026	Dec. 30, 2026	Dec. 30, 2026	Dec. 30, 2026
Investment Owned, Balance, Principal Amount	$ 8,191	$ 8,191
Investment Owned, at Cost	8,052	8,027
Investment Owned, at Fair Value	$ 7,946	$ 8,027
Investment, Identifier [Axis]: Crown Brands LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:CrownBrandsLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Distributors [Member]		Distributors [Member]	Distributors [Member]
Investment, Variable Interest Rate, Type [Extensible Enumeration]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]		Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
Investment, Interest Rate, Floor	1%		1%	1%
Investment, Basis Spread, Variable Rate	10%		10%	10%
Investment Interest Rate	12.95%		12.95%	12.95%
Investment, Acquisition Date	Apr. 22, 2022
Investment Maturity Date	Dec. 09, 2025		Dec. 09, 2025	Dec. 09, 2025
Investment Owned, Balance, Principal Amount	$ 357
Investment Owned, at Cost	357
Investment Owned, at Fair Value	$ 344
Investment, Identifier [Axis]: Crown Brands LLC Second Lien Secured Delayed Draw Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:CrownBrandsLLCMember	whf:CrownBrandsLLCMember
Investment, Type [Extensible Enumeration]	whf:SecondLienSecuredDelayedDrawLoanMember	whf:SecondLienSecuredDelayedDrawLoanMember	whf:SecondLienSecuredDelayedDrawLoanMember	whf:SecondLienSecuredDelayedDrawLoanMember	whf:SecondLienSecuredDelayedDrawLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Distributors [Member]	Distributors [Member]	Distributors [Member]	Distributors [Member]	Distributors [Member]
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor	1.50%	1.50%	1.50%	1.50%	1.50%
Investment, Basis Spread, Variable Rate	10.50%	10.50%	10.50%	10.50%	10.50%
Investment Interest Rate	13.74%	12%	13.74%	13.74%	12%
Investment, Acquisition Date	Dec. 15, 2020	Dec. 15, 2020
Investment Maturity Date	Jan. 08, 2026	Jan. 08, 2026	Jan. 08, 2026	Jan. 08, 2026	Jan. 08, 2026
Investment Owned, Balance, Principal Amount	$ 651	$ 650
Investment Owned, at Cost	651	650
Investment Owned, at Fair Value	$ 423	$ 520
Investment, Identifier [Axis]: Crown Brands LLC Second Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:CrownBrandsLLCMember	whf:CrownBrandsLLCMember
Investment, Type [Extensible Enumeration]	whf:SecondLienSecuredTermLoanMember	whf:SecondLienSecuredTermLoanMember	whf:SecondLienSecuredTermLoanMember	whf:SecondLienSecuredTermLoanMember	whf:SecondLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Distributors [Member]	Distributors [Member]	Distributors [Member]	Distributors [Member]	Distributors [Member]
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor	1.50%	1.50%	1.50%	1.50%	1.50%
Investment, Basis Spread, Variable Rate	10.50%	10.50%	10.50%	10.50%	10.50%
Investment Interest Rate	13.62%	12%	13.62%	13.62%	12%
Investment, Acquisition Date	Dec. 15, 2020	Dec. 15, 2020
Investment Maturity Date	Jan. 08, 2026	Jan. 08, 2026	Jan. 08, 2026	Jan. 08, 2026	Jan. 08, 2026
Investment Owned, Balance, Principal Amount	$ 4,386	$ 4,382
Investment Owned, at Cost	4,318	4,299
Investment Owned, at Fair Value	$ 2,851	$ 3,505
Investment, Identifier [Axis]: DCA Investment Holding, LLC First Lien Secured Delayed Draw Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]		whf:DCAInvestmentHoldingLLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredDelayedDrawLoanMember			whf:FirstLienSecuredDelayedDrawLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Health Care Services [Member]			Health Care Services [Member]
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor		0.75%			0.75%
Investment, Basis Spread, Variable Rate		6.25%			6.25%
Investment Interest Rate		7%			7%
Investment, Acquisition Date		Mar. 12, 2021
Investment Maturity Date		Mar. 12, 2027			Mar. 12, 2027
Investment Owned, Balance, Principal Amount		$ 678
Investment Owned, at Cost		672
Investment Owned, at Fair Value		$ 688
Investment, Identifier [Axis]: DCA Investment Holding, LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]		whf:DCAInvestmentHoldingLLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Health Care Services [Member]			Health Care Services [Member]
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor		0.75%			0.75%
Investment, Basis Spread, Variable Rate		6.25%			6.25%
Investment Interest Rate		7%			7%
Investment, Acquisition Date		Mar. 12, 2021
Investment Maturity Date		Mar. 12, 2027			Mar. 12, 2027
Investment Owned, Balance, Principal Amount		$ 7,025
Investment Owned, at Cost		6,933
Investment Owned, at Fair Value		$ 6,988
Investment, Identifier [Axis]: Drew Foam Companies Inc First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]		whf:DrewFoamCompaniesIncMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Building Products			Building Products
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor		1%			1%
Investment, Basis Spread, Variable Rate		6%			6%
Investment Interest Rate		7%			7%
Investment, Acquisition Date		Nov. 05, 2020
Investment Maturity Date		Nov. 05, 2025			Nov. 05, 2025
Investment Owned, Balance, Principal Amount		$ 7,207
Investment Owned, at Cost		7,094
Investment Owned, at Fair Value		$ 7,183
Investment, Identifier [Axis]: Drew Foam Companies Inc, First Lien Secured Term Loan, Floor 1.00%, Spread L plus 6.00%, Rate 7.00%, Due 11/5/2025
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:DrewFoamCompaniesIncMember	whf:DrewFoamCompaniesIncMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Building Products	Building Products	Building Products	Building Products	Building Products
Investment, Interest Rate, Floor	1%	1%	1%	1%	1%
Investment, Basis Spread, Variable Rate	6%	6%	6%	6%	6%
Investment Interest Rate	9.67%	7%	9.67%	9.67%	7%
Investment, Acquisition Date	Nov. 09, 2020	Nov. 09, 2020
Investment Maturity Date	Nov. 05, 2025	Nov. 05, 2025	Nov. 05, 2025	Nov. 05, 2025	Nov. 05, 2025
Investment Owned, Balance, Principal Amount	$ 14,305	$ 7,207
Investment Owned, at Cost	14,125	7,096
Investment Owned, at Fair Value	$ 14,305	$ 7,183
Investment, Identifier [Axis]: E-Phoenix Acquisition Co. Inc., First Lien Secured Term Loan, Floor 1.00%, Spread L plus 5.75%, Rate 6.75%, Due 6/23/2027
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:E-PhoenixAcquisitionCo.Inc.Member	whf:E-PhoenixAcquisitionCo.Inc.Member
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Research & Consulting Services	Research & Consulting Services	Research & Consulting Services	Research & Consulting Services	Research & Consulting Services
Investment, Interest Rate, Floor	1%	1%	1%	1%	1%
Investment, Basis Spread, Variable Rate	5.75%	5.75%	5.75%	5.75%	5.75%
Investment Interest Rate	9.42%	6.75%	9.42%	9.42%	6.75%
Investment, Acquisition Date	Jul. 15, 2021	Jul. 15, 2021
Investment Maturity Date	Jun. 23, 2027	Jun. 23, 2027	Jun. 23, 2027	Jun. 23, 2027	Jun. 23, 2027
Investment Owned, Balance, Principal Amount	$ 8,888	$ 8,955
Investment Owned, at Cost	8,799	8,852
Investment Owned, at Fair Value	$ 8,832	$ 8,901
Investment, Identifier [Axis]: Eddy Acquisitions, LLC Preferred Units
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:EddyAcquisitionsLLCMember	whf:EddyAcquisitionsLLCMember
Investment, Type [Extensible Enumeration]	whf:PreferredUnitsMember	whf:PreferredUnitsMember	whf:PreferredUnitsMember	whf:PreferredUnitsMember	whf:PreferredUnitsMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Education Services [Member]	Education Services [Member]	Education Services [Member]	Education Services [Member]	Education Services [Member]
Investment, Basis Spread, Variable Rate	12%	12%	12%	12%	12%
Investment Interest Rate	12%	12%	12%	12%	12%
Investment, Acquisition Date	Sep. 15, 2021	Sep. 15, 2021
Investment Owned, Balance, Principal Amount	$ 167	$ 167
Investment Owned, at Cost	167	167
Investment Owned, at Fair Value	$ 118	$ 167
Investment, Identifier [Axis]: Education Networks of America, Inc First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]		whf:EducationNetworksofAmericaIncMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Application Software			Application Software
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor		1%			1%
Investment, Basis Spread, Variable Rate		5.50%			5.50%
Investment Interest Rate		6.50%			6.50%
Investment, Acquisition Date		Nov. 30, 2021
Investment Maturity Date		Oct. 27, 2026			Oct. 27, 2026
Investment Owned, Balance, Principal Amount		$ 4,719
Investment Owned, at Cost		4,511
Investment Owned, at Fair Value		$ 4,508
Investment, Identifier [Axis]: EducationDynamics, LLC First Lien Secured Delayed Draw Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:EducationDynamicsLLCMember	whf:EducationDynamicsLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Education Services [Member]	Education Services [Member]	Education Services [Member]	Education Services [Member]	Education Services [Member]
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor	1%	1%	1%	1%	1%
Investment, Basis Spread, Variable Rate	7%	7%	7%	7%	7%
Investment Interest Rate	10.05%	8%	10.05%	10.05%	8%
Investment, Acquisition Date	Sep. 15, 2021	Sep. 15, 2021
Investment Maturity Date	Sep. 15, 2026	Sep. 15, 2026	Sep. 15, 2026	Sep. 15, 2026	Sep. 15, 2026
Investment Owned, at Fair Value	$ (3)
Investment, Interest Rate, Paid in Kind	0.50%	0.50%	0.50%	0.50%	0.50%
Investment, Interest Rate, Paid in Cash	9.55%	7.50%	9.55%	9.55%	7.50%
Investment, Identifier [Axis]: EducationDynamics, LLC First Lien Secured Revolving Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:EducationDynamicsLLCMember	whf:EducationDynamicsLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Education Services [Member]	Education Services [Member]	Education Services [Member]	Education Services [Member]	Education Services [Member]
Investment, Variable Interest Rate, Type [Extensible Enumeration]	us-gaap:PrimeRateMember	London Interbank Offered Rate (LIBOR) [Member]	us-gaap:PrimeRateMember	us-gaap:PrimeRateMember	London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor	1%	1%	1%	1%	1%
Investment, Basis Spread, Variable Rate	5.50%	7%	5.50%	5.50%	7%
Investment Interest Rate	11.75%	8%	11.75%	11.75%	8%
Investment, Acquisition Date	Sep. 15, 2021	Sep. 15, 2021
Investment Maturity Date	Sep. 15, 2026	Sep. 15, 2026	Sep. 15, 2026	Sep. 15, 2026	Sep. 15, 2026
Investment Owned, Balance, Principal Amount	$ 240
Investment Owned, at Cost	236
Investment Owned, at Fair Value	$ 234
Investment, Interest Rate, Paid in Kind		0.50%			0.50%
Investment, Interest Rate, Paid in Cash		7.50%			7.50%
Investment, Identifier [Axis]: EducationDynamics, LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:EducationDynamicsLLCMember	whf:EducationDynamicsLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Education Services [Member]	Education Services [Member]	Education Services [Member]	Education Services [Member]	Education Services [Member]
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor	1%	1%	1%	1%	1%
Investment, Basis Spread, Variable Rate	7%	7%	7%	7%	7%
Investment Interest Rate	10.05%	8%	10.05%	10.05%	8%
Investment, Acquisition Date	Sep. 15, 2021	Sep. 15, 2021
Investment Maturity Date	Sep. 15, 2026	Sep. 15, 2026	Sep. 15, 2026	Sep. 15, 2026	Sep. 15, 2026
Investment Owned, Balance, Principal Amount	$ 13,119	$ 13,318
Investment Owned, at Cost	12,912	13,068
Investment Owned, at Fair Value	$ 12,887	$ 13,064
Investment, Interest Rate, Paid in Kind	0.50%	0.50%	0.50%	0.50%	0.50%
Investment, Interest Rate, Paid in Cash	9.55%	7.50%	9.55%	9.55%	7.50%
Investment, Identifier [Axis]: EducationDynamics, LLC Subordinated Unsecured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:EducationDynamicsLLCMember	whf:EducationDynamicsLLCMember
Investment, Type [Extensible Enumeration]	whf:SubordinatedUnsecuredTermLoanMember	whf:SubordinatedUnsecuredTermLoanMember	whf:SubordinatedUnsecuredTermLoanMember	whf:SubordinatedUnsecuredTermLoanMember	whf:SubordinatedUnsecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Education Services [Member]	Education Services [Member]	Education Services [Member]	Education Services [Member]	Education Services [Member]
Investment, Basis Spread, Variable Rate	4%	4%	4%	4%	4%
Investment Interest Rate	4%	4%	4%	4%	4%
Investment, Acquisition Date	Sep. 15, 2021	Sep. 15, 2021
Investment Maturity Date	Mar. 15, 2027	Mar. 15, 2027	Mar. 15, 2027	Mar. 15, 2027	Mar. 15, 2027
Investment Owned, Balance, Principal Amount	$ 167	$ 167
Investment Owned, at Cost	167	167
Investment Owned, at Fair Value	$ 167	$ 167
Investment, Identifier [Axis]: Empire Office, Inc First Lien Secured Delayed Draw Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:EmpireOfficeIncMember	whf:EmpireOfficeIncMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Office Services And Supplies [Member]	Office Services And Supplies [Member]	Office Services And Supplies [Member]	Office Services And Supplies [Member]	Office Services And Supplies [Member]
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor	1.50%	1.50%	1.50%	1.50%	1.50%
Investment, Basis Spread, Variable Rate	6.50%	6.75%	6.50%	6.50%	6.75%
Investment Interest Rate	9.62%	8.25%	9.62%	9.62%	8.25%
Investment, Acquisition Date	Aug. 17, 2021	Aug. 17, 2021
Investment Maturity Date	Apr. 12, 2024	Apr. 12, 2024	Apr. 12, 2024	Apr. 12, 2024	Apr. 12, 2024
Investment Owned, Balance, Principal Amount	$ 4,864
Investment Owned, at Cost	4,792
Investment Owned, at Fair Value	$ 4,820	$ 7
Investment, Identifier [Axis]: Empire Office, Inc First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:EmpireOfficeIncMember	whf:EmpireOfficeIncMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Office Services And Supplies [Member]	Office Services And Supplies [Member]	Office Services And Supplies [Member]	Office Services And Supplies [Member]	Office Services And Supplies [Member]
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor	1.50%	1.50%	1.50%	1.50%	1.50%
Investment, Basis Spread, Variable Rate	6.50%	6.75%	6.50%	6.50%	6.75%
Investment Interest Rate	9.62%	8.25%	9.62%	9.62%	8.25%
Investment, Acquisition Date	Apr. 12, 2019	Apr. 12, 2019
Investment Maturity Date	Apr. 12, 2024	Apr. 12, 2024	Apr. 12, 2024	Apr. 12, 2024	Apr. 12, 2024
Investment Owned, Balance, Principal Amount	$ 12,019	$ 12,656
Investment Owned, at Cost	11,923	12,507
Investment Owned, at Fair Value	$ 11,910	$ 12,589
Investment, Identifier [Axis]: Epiphany Business Services, LLC First Lien Secured Delayed Draw Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]		whf:EpiphanyBusinessServicesLLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredDelayedDrawLoanMember			whf:FirstLienSecuredDelayedDrawLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Health Care Facilities [Member]			Health Care Facilities [Member]
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor		1%			1%
Investment, Basis Spread, Variable Rate		7.50%			7.50%
Investment Interest Rate		8.50%			8.50%
Investment, Acquisition Date		Dec. 04, 2020
Investment Maturity Date		Jun. 22, 2023			Jun. 22, 2023
Investment Owned, Balance, Principal Amount		$ 3,052
Investment Owned, at Cost		3,008
Investment Owned, at Fair Value		$ 3,027
Investment, Identifier [Axis]: Epiphany Business Services, LLC First Lien Secured Revolving Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]		whf:EpiphanyBusinessServicesLLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredRevolvingLoanMember			whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Health Care Facilities [Member]			Health Care Facilities [Member]
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor		1%			1%
Investment, Basis Spread, Variable Rate		7.50%			7.50%
Investment Interest Rate		8.50%			8.50%
Investment, Acquisition Date		Dec. 04, 2020
Investment Maturity Date		Jun. 22, 2023			Jun. 22, 2023
Investment Owned, at Fair Value		$ 3
Investment, Identifier [Axis]: Epiphany Business Services, LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]		whf:EpiphanyBusinessServicesLLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Health Care Facilities [Member]			Health Care Facilities [Member]
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor		1%			1%
Investment, Basis Spread, Variable Rate		7.50%			7.50%
Investment Interest Rate		8.50%			8.50%
Investment, Acquisition Date		Dec. 04, 2020
Investment Maturity Date		Jun. 22, 2023			Jun. 22, 2023
Investment Owned, Balance, Principal Amount		$ 4,278
Investment Owned, at Cost		4,214
Investment Owned, at Fair Value		$ 4,235
Investment, Identifier [Axis]: Escalon Services Inc First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:EscalonServicesIncMember	whf:EscalonServicesIncMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Data Processing & Outsourced Services	Data Processing & Outsourced Services	Data Processing & Outsourced Services	Data Processing & Outsourced Services	Data Processing & Outsourced Services
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor	1%	1%	1%	1%	1%
Investment, Basis Spread, Variable Rate	10.31%	13.50%	10.31%	10.31%	13.50%
Investment Interest Rate	13.22%	14.50%	13.22%	13.22%	14.50%
Investment, Acquisition Date	Dec. 04, 2020	Dec. 04, 2020
Investment Maturity Date	Dec. 04, 2025	Dec. 04, 2025	Dec. 04, 2025	Dec. 04, 2025	Dec. 04, 2025
Investment Owned, Balance, Principal Amount	$ 17,278	$ 8,046
Investment Owned, at Cost	16,599	7,490
Investment Owned, at Fair Value	$ 17,797	$ 8,046
Investment, Interest Rate, Paid in Kind	1.50%		1.50%	1.50%
Investment, Interest Rate, Paid in Cash	11.72%	13%	11.72%	11.72%	13%
Investment, Identifier [Axis]: Escalon Services Inc Warrants
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:EscalonServicesIncMember	whf:EscalonServicesIncMember
Investment, Type [Extensible Enumeration]	Warrant [Member]	Warrant [Member]	Warrant [Member]	Warrant [Member]	Warrant [Member]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Data Processing & Outsourced Services	Data Processing & Outsourced Services	Data Processing & Outsourced Services	Data Processing & Outsourced Services	Data Processing & Outsourced Services
Investment, Acquisition Date	Dec. 04, 2020	Dec. 04, 2020
Investment Owned, Balance, Principal Amount	$ 709	$ 709
Investment Owned, at Cost	476	476
Investment Owned, at Fair Value	$ 2,368	$ 893
Investment, Identifier [Axis]: FR Flow Control CB LLC, First Lien Secured Term Loan B, Floor 1.00%, Spread L plus 5.50%, Rate 6.50%, Due 6/28/2026
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]		whf:FRFlowControlCBLLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredTermLoanBMember			whf:FirstLienSecuredTermLoanBMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Industrial Machinery			Industrial Machinery
Investment, Interest Rate, Floor		1%			1%
Investment, Basis Spread, Variable Rate		5.50%			5.50%
Investment Interest Rate		6.50%			6.50%
Investment, Acquisition Date		Jul. 19, 2019
Investment Maturity Date		Jun. 28, 2026			Jun. 28, 2026
Investment Owned, Balance, Principal Amount		$ 6,815
Investment Owned, at Cost		6,727
Investment Owned, at Fair Value		$ 6,815
Investment, Identifier [Axis]: Flexitallic Group SAS First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:FlexitallicGroupSASMember	whf:FlexitallicGroupSASMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Commodity Chemicals [Member]	Commodity Chemicals [Member]	Commodity Chemicals [Member]	Commodity Chemicals [Member]	Commodity Chemicals [Member]
Investment, Variable Interest Rate, Type [Extensible Enumeration]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	London Interbank Offered Rate (LIBOR) [Member]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor	1%	1%	1%	1%	1%
Investment, Basis Spread, Variable Rate	7.50%	7.50%	7.50%	7.50%	7.50%
Investment Interest Rate	11.20%	8.50%	11.20%	11.20%	8.50%
Investment, Acquisition Date	Oct. 28, 2019	Oct. 28, 2019
Investment Maturity Date	Oct. 29, 2026	Oct. 29, 2026	Oct. 29, 2026	Oct. 29, 2026	Oct. 29, 2026
Investment Owned, Balance, Principal Amount	$ 16,371	$ 15,722
Investment Owned, at Cost	15,777	15,047
Investment Owned, at Fair Value	$ 16,003	$ 15,172
Investment, Interest Rate, Paid in Kind	0.50%	0.50%	0.50%	0.50%	0.50%
Investment, Interest Rate, Paid in Cash	10.70%	8%	10.70%	10.70%	8%
Investment, Identifier [Axis]: Future Payment Technologies, LP First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:FuturePaymentTechnologiesLPMember	whf:FuturePaymentTechnologiesLPMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Data Processing & Outsourced Services	Data Processing & Outsourced Services	Data Processing & Outsourced Services	Data Processing & Outsourced Services	Data Processing & Outsourced Services
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor	1%	1%	1%	1%	1%
Investment, Basis Spread, Variable Rate	8.25%	8.25%	8.25%	8.25%	8.25%
Investment Interest Rate	10.81%	9.25%	10.81%	10.81%	9.25%
Investment, Acquisition Date	Dec. 23, 2016	Dec. 23, 2016
Investment Maturity Date	Jun. 07, 2024	Jun. 07, 2024	Jun. 07, 2024	Jun. 07, 2024	Jun. 07, 2024
Investment Owned, Balance, Principal Amount	$ 23,222	$ 24,000
Investment Owned, at Cost	23,074	23,811
Investment Owned, at Fair Value	$ 23,222	$ 23,925
Investment, Identifier [Axis]: Geo Logic Systems Ltd., First Lien Secured Revolving Loan, Floor 1.00%, Spread C plus 6.50%, Rate 7.50%, Due 12/19/2024
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:GeoLogicSystemsLtdMember	whf:GeoLogicSystemsLtdMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Data Processing & Outsourced Services	Data Processing & Outsourced Services	Data Processing & Outsourced Services	Data Processing & Outsourced Services	Data Processing & Outsourced Services
Investment, Interest Rate, Floor	1%	1%	1%	1%	1%
Investment, Basis Spread, Variable Rate	6.50%	6.50%	6.50%	6.50%	6.50%
Investment Interest Rate	10.67%	7.50%	10.67%	10.67%	7.50%
Investment, Acquisition Date	Jan. 22, 2020	Jan. 22, 2020
Investment Maturity Date	Dec. 19, 2024	Dec. 19, 2024	Dec. 19, 2024	Dec. 19, 2024	Dec. 19, 2024
Investment Owned, at Fair Value	$ 2	$ 4
Investment, Identifier [Axis]: Geo Logic Systems Ltd., First Lien Secured Term Loan, Floor 1.00%, Spread C plus 6.50%, Rate 7.50%, Due 12/19/2024
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:GeoLogicSystemsLtdMember	whf:GeoLogicSystemsLtdMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Data Processing & Outsourced Services	Data Processing & Outsourced Services	Data Processing & Outsourced Services	Data Processing & Outsourced Services	Data Processing & Outsourced Services
Investment, Interest Rate, Floor	1%	1%	1%	1%	1%
Investment, Basis Spread, Variable Rate	6.50%	6.50%	6.50%	6.50%	6.50%
Investment Interest Rate	10.67%	7.50%	10.67%	10.67%	7.50%
Investment, Acquisition Date	Jan. 22, 2020	Jan. 22, 2020
Investment Maturity Date	Dec. 19, 2024	Dec. 19, 2024	Dec. 19, 2024	Dec. 19, 2024	Dec. 19, 2024
Investment Owned, Balance, Principal Amount	$ 20,225	$ 20,632
Investment Owned, at Cost	15,497	15,766
Investment Owned, at Fair Value	$ 14,505	$ 16,156
Investment, Identifier [Axis]: Grupo HIMA San Pablo, Inc Amended Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]		whf:GrupoHIMASanPabloIncMember
Investment, Type [Extensible Enumeration]		whf:AmendedTermLoanMember			whf:AmendedTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Health Care Facilities [Member]			Health Care Facilities [Member]
Investment, Interest Rate, Floor		1.50%			1.50%
Investment, Basis Spread, Variable Rate		9%			9%
Investment Interest Rate		10.50%			10.50%
Investment, Acquisition Date		Nov. 24, 2021
Investment Maturity Date		Nov. 24, 2023			Nov. 24, 2023
Investment Owned, Balance, Principal Amount		$ 1,708
Investment Owned, at Cost		1,704
Investment Owned, at Fair Value		$ 1,708
Investment, Interest Rate, Paid in Kind		10.50%			10.50%
Investment, Interest Rate, Paid in Cash		0%			0%
Investment, Identifier [Axis]: Grupo HIMA San Pablo, Inc First Lien Secured Term Loan A
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]		whf:GrupoHIMASanPabloIncMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredTermLoanAMember			whf:FirstLienSecuredTermLoanAMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Health Care Facilities [Member]			Health Care Facilities [Member]
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Investment, Basis Spread, Variable Rate		9%			9%
Investment Interest Rate		9.13%			9.13%
Investment, Acquisition Date		May 05, 2019
Investment Maturity Date		Apr. 30, 2019			Apr. 30, 2019
Investment Owned, Balance, Principal Amount		$ 3,476
Investment Owned, at Cost		3,476
Investment Owned, at Fair Value		$ 1,169
Investment, Identifier [Axis]: Grupo HIMA San Pablo, Inc First Lien Secured Term Loan B
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]		whf:GrupoHIMASanPabloIncMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredTermLoanBMember			whf:FirstLienSecuredTermLoanBMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Health Care Facilities [Member]			Health Care Facilities [Member]
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor		1.50%			1.50%
Investment, Basis Spread, Variable Rate		9%			9%
Investment Interest Rate		10.50%			10.50%
Investment, Acquisition Date		Feb. 01, 2013
Investment Maturity Date		Apr. 30, 2019			Apr. 30, 2019
Investment Owned, Balance, Principal Amount		$ 12,185
Investment Owned, at Cost		12,185
Investment Owned, at Fair Value		$ 4,097
Investment, Interest Rate, Paid in Kind		2%			2%
Investment, Interest Rate, Paid in Cash		13.75%			13.75%
Investment, Identifier [Axis]: Grupo HIMA San Pablo, Inc Second Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]		whf:GrupoHIMASanPabloIncMember
Investment, Type [Extensible Enumeration]		whf:SecondLienSecuredTermLoanMember			whf:SecondLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Health Care Facilities [Member]			Health Care Facilities [Member]
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Investment, Basis Spread, Variable Rate		15.75%			15.75%
Investment Interest Rate		15.75%			15.75%
Investment, Acquisition Date		Feb. 01, 2013
Investment Maturity Date		Jul. 31, 2018			Jul. 31, 2018
Investment Owned, Balance, Principal Amount		$ 1,028
Investment Owned, at Cost		$ 1,024
Investment, Identifier [Axis]: Grupo HIMA San Pablo, Inc Superpriority Delayed Draw Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]		whf:GrupoHIMASanPabloIncMember
Investment, Type [Extensible Enumeration]		whf:SuperpriorityDelayedDrawLoanMember			whf:SuperpriorityDelayedDrawLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Health Care Facilities [Member]			Health Care Facilities [Member]
Investment, Basis Spread, Variable Rate		12%			12%
Investment Interest Rate		12%			12%
Investment, Acquisition Date		Nov. 24, 2021
Investment Maturity Date		Nov. 24, 2023			Nov. 24, 2023
Investment Owned, Balance, Principal Amount		$ 568
Investment Owned, at Cost		568
Investment Owned, at Fair Value		$ 568
Investment, Identifier [Axis]: HC Salon Holdings, Inc First Lien Secured Revolving Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:HCSalonHoldingsIncMember	whf:HCSalonHoldingsIncMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Specialized Consumer Services [Member]	Specialized Consumer Services [Member]	Specialized Consumer Services [Member]	Specialized Consumer Services [Member]	Specialized Consumer Services [Member]
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor	1%	1%	1%	1%	1%
Investment, Basis Spread, Variable Rate	8%	8%	8%	8%	8%
Investment Interest Rate	11.67%	9%	11.67%	11.67%	9%
Investment, Acquisition Date	Sep. 30, 2021	Sep. 30, 2021
Investment Maturity Date	Sep. 30, 2026	Sep. 30, 2026	Sep. 30, 2026	Sep. 30, 2026	Sep. 30, 2026
Investment Owned, at Fair Value	$ 11
Investment, Identifier [Axis]: HC Salon Holdings, Inc First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:HCSalonHoldingsIncMember	whf:HCSalonHoldingsIncMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Specialized Consumer Services [Member]	Specialized Consumer Services [Member]	Specialized Consumer Services [Member]	Specialized Consumer Services [Member]	Specialized Consumer Services [Member]
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor	1%	1%	1%	1%	1%
Investment, Basis Spread, Variable Rate	8%	8%	8%	8%	8%
Investment Interest Rate	11.67%	9%	11.67%	11.67%	9%
Investment, Acquisition Date	Sep. 30, 2021	Sep. 30, 2021
Investment Maturity Date	Sep. 30, 2026	Sep. 30, 2026	Sep. 30, 2026	Sep. 30, 2026	Sep. 30, 2026
Investment Owned, Balance, Principal Amount	$ 11,550	$ 11,638
Investment Owned, at Cost	11,365	11,417
Investment Owned, at Fair Value	$ 11,550	$ 11,416
Investment, Identifier [Axis]: HRG Management, LLC First Lien Secured Delayed Draw Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]		whf:HRGManagementLLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredDelayedDrawLoanMember			whf:FirstLienSecuredDelayedDrawLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Real Estate Operating Companies			Real Estate Operating Companies
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor		1%			1%
Investment, Basis Spread, Variable Rate		6.25%			6.25%
Investment Interest Rate		7.25%			7.25%
Investment, Acquisition Date		Oct. 19, 2021
Investment Maturity Date		Oct. 19, 2026			Oct. 19, 2026
Investment Owned, Balance, Principal Amount		$ 653
Investment Owned, at Cost		644
Investment Owned, at Fair Value		$ 651
Investment, Identifier [Axis]: HRG Management, LLC First Lien Secured Revolving Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]		whf:HRGManagementLLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredRevolvingLoanMember			whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Real Estate Operating Companies			Real Estate Operating Companies
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor		1%			1%
Investment, Basis Spread, Variable Rate		6.25%			6.25%
Investment Interest Rate		7.25%			7.25%
Investment, Acquisition Date		Oct. 19, 2021
Investment Maturity Date		Oct. 19, 2026			Oct. 19, 2026
Investment, Identifier [Axis]: HRG Management, LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]		whf:HRGManagementLLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Real Estate Operating Companies			Real Estate Operating Companies
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor		1%			1%
Investment, Basis Spread, Variable Rate		6.25%			6.25%
Investment Interest Rate		7.25%			7.25%
Investment, Acquisition Date		Oct. 19, 2021
Investment Maturity Date		Oct. 19, 2026			Oct. 19, 2026
Investment Owned, Balance, Principal Amount		$ 4,875
Investment Owned, at Cost		4,781
Investment Owned, at Fair Value		$ 4,780
Investment, Identifier [Axis]: HRG Management, LLC, First Lien Secured Delayed Draw Loan, Floor 1.00%, Spread L plus 6.25%, Rate 7.29%, Due 10/19/2026
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	HRG Management, LLC HomeRiver Group, LLC [Member]
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredDelayedDrawLoanMember		whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Real Estate Operating Companies		Real Estate Operating Companies	Real Estate Operating Companies
Investment, Interest Rate, Floor	1%		1%	1%
Investment, Basis Spread, Variable Rate	6.25%		6.25%	6.25%
Investment Interest Rate	8.99%		8.99%	8.99%
Investment, Acquisition Date	Feb. 18, 2022
Investment Maturity Date	Oct. 19, 2026		Oct. 19, 2026	Oct. 19, 2026
Investment Owned, Balance, Principal Amount	$ 1,273
Investment Owned, at Cost	1,257
Investment Owned, at Fair Value	$ 1,242
Investment, Identifier [Axis]: HRG Management, LLC, First Lien Secured Revolving Loan, Floor 1.00%, Spread L plus 6.25%, Rate 7.29%, Due 10/19/2026
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	HRG Management, LLC HomeRiver Group, LLC [Member]
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember		whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Real Estate Operating Companies		Real Estate Operating Companies	Real Estate Operating Companies
Investment, Interest Rate, Floor	1%		1%	1%
Investment, Basis Spread, Variable Rate	6.25%		6.25%	6.25%
Investment Interest Rate	8.99%		8.99%	8.99%
Investment, Acquisition Date	Feb. 18, 2022
Investment Maturity Date	Oct. 19, 2026		Oct. 19, 2026	Oct. 19, 2026
Investment Owned, at Fair Value	$ (4)
Investment, Identifier [Axis]: HRG Management, LLC, First Lien Secured Term Loan, Floor 1.00%, Spread L plus 6.25%, Rate 7.25%, Due 10/19/2026
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]		HRG Management, LLC HomeRiver Group, LLC [Member]
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Real Estate Operating Companies			Real Estate Operating Companies
Investment, Interest Rate, Floor		1%			1%
Investment, Basis Spread, Variable Rate		6.25%			6.25%
Investment Interest Rate		7.25%			7.25%
Investment, Acquisition Date		Dec. 28, 2021
Investment Maturity Date		Oct. 19, 2026			Oct. 19, 2026
Investment Owned, Balance, Principal Amount		$ 4,875
Investment Owned, at Cost		4,781
Investment Owned, at Fair Value		$ 4,780
Investment, Identifier [Axis]: HRG Management, LLC, First Lien Secured Term Loan, Floor 1.00%, Spread L plus 6.25%, Rate 7.29%, Due 10/19/2026
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	HRG Management, LLC HomeRiver Group, LLC [Member]
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Real Estate Operating Companies		Real Estate Operating Companies	Real Estate Operating Companies
Investment, Interest Rate, Floor	1%		1%	1%
Investment, Basis Spread, Variable Rate	6.25%		6.25%	6.25%
Investment Interest Rate	8.99%		8.99%	8.99%
Investment, Acquisition Date	Dec. 28, 2021
Investment Maturity Date	Oct. 19, 2026		Oct. 19, 2026	Oct. 19, 2026
Investment Owned, Balance, Principal Amount	$ 9,677
Investment Owned, at Cost	9,520
Investment Owned, at Fair Value	$ 9,484
Investment, Identifier [Axis]: Hollander Intermediate LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:HollanderIntermediateLlcMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Home Furnishings [Member]		Home Furnishings [Member]	Home Furnishings [Member]
Investment, Variable Interest Rate, Type [Extensible Enumeration]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]		Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
Investment, Interest Rate, Floor	2%		2%	2%
Investment, Basis Spread, Variable Rate	8.75%		8.75%	8.75%
Investment Interest Rate	11.79%		11.79%	11.79%
Investment, Acquisition Date	Sep. 19, 2022
Investment Maturity Date	Sep. 21, 2026		Sep. 21, 2026	Sep. 21, 2026
Investment Owned, Balance, Principal Amount	$ 4,891
Investment Owned, at Cost	4,849
Investment Owned, at Fair Value	$ 4,671
Investment, Identifier [Axis]: Honors Holdings, LLC First Lien Secured Delayed Draw Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:HonorsHoldingsLLCMember	whf:HonorsHoldingsLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Leisure Facilities [Member]	Leisure Facilities [Member]	Leisure Facilities [Member]	Leisure Facilities [Member]	Leisure Facilities [Member]
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor	1%	1%	1%	1%	1%
Investment, Basis Spread, Variable Rate	7.46%	7.58%	7.46%	7.46%	7.58%
Investment Interest Rate	10.80%	8.58%	10.80%	10.80%	8.58%
Investment, Acquisition Date	Sep. 06, 2019	Sep. 06, 2019
Investment Maturity Date	Sep. 06, 2024	Sep. 06, 2024	Sep. 06, 2024	Sep. 06, 2024	Sep. 06, 2024
Investment Owned, Balance, Principal Amount	$ 4,649	$ 4,649
Investment Owned, at Cost	4,618	4,611
Investment Owned, at Fair Value	$ 4,603	$ 4,578
Investment, Interest Rate, Paid in Kind	0.50%	0.50%	0.50%	0.50%	0.50%
Investment, Interest Rate, Paid in Cash	10.30%	8.08%	10.30%	10.30%	8.08%
Investment, Identifier [Axis]: Honors Holdings, LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:HonorsHoldingsLLCMember	whf:HonorsHoldingsLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Leisure Facilities [Member]	Leisure Facilities [Member]	Leisure Facilities [Member]	Leisure Facilities [Member]	Leisure Facilities [Member]
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor	1%	1%	1%	1%	1%
Investment, Basis Spread, Variable Rate	7.56%	7.96%	7.56%	7.56%	7.96%
Investment Interest Rate	10.73%	8.96%	10.73%	10.73%	8.96%
Investment, Acquisition Date	Sep. 06, 2019	Sep. 06, 2019
Investment Maturity Date	Sep. 06, 2024	Sep. 06, 2024	Sep. 06, 2024	Sep. 06, 2024	Sep. 06, 2024
Investment Owned, Balance, Principal Amount	$ 9,440	$ 9,440
Investment Owned, at Cost	9,337	9,315
Investment Owned, at Fair Value	$ 9,346	$ 9,296
Investment, Interest Rate, Paid in Kind	0.50%	0.50%	0.50%	0.50%	0.50%
Investment, Interest Rate, Paid in Cash	10.23%	8.46%	10.23%	10.23%	8.46%
Investment, Identifier [Axis]: I And I Sales Group, LLC First Lien Secured Delayed Draw Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]		whf:IAndISalesGroupLLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredDelayedDrawLoanMember			whf:FirstLienSecuredDelayedDrawLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Advertising			Advertising
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor		1%			1%
Investment, Basis Spread, Variable Rate		6%			6%
Investment Interest Rate		7%			7%
Investment, Acquisition Date		Dec. 15, 2021
Investment Maturity Date		Dec. 15, 2026			Dec. 15, 2026
Investment Owned, Balance, Principal Amount		$ 396
Investment Owned, at Cost		388
Investment Owned, at Fair Value		$ 388
Investment, Identifier [Axis]: I And I Sales Group, LLC First Lien Secured Revolving Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]		whf:IAndISalesGroupLLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredRevolvingLoanMember			whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Advertising			Advertising
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor		1%			1%
Investment, Basis Spread, Variable Rate		6%			6%
Investment Interest Rate		7%			7%
Investment, Acquisition Date		Dec. 15, 2021
Investment Maturity Date		Dec. 15, 2026			Dec. 15, 2026
Investment, Identifier [Axis]: I And I Sales Group, LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]		whf:IAndISalesGroupLLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Advertising			Advertising
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor		1%			1%
Investment, Basis Spread, Variable Rate		6%			6%
Investment Interest Rate		7%			7%
Investment, Acquisition Date		Dec. 15, 2021
Investment Maturity Date		Dec. 15, 2026			Dec. 15, 2026
Investment Owned, Balance, Principal Amount		$ 9,286
Investment Owned, at Cost		9,102
Investment Owned, at Fair Value		$ 9,100
Investment, Identifier [Axis]: I&I Sales Group, LLC First Lien Secured Delayed Draw Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:IAndISalesGroupLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredDelayedDrawLoanMember		whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Advertising		Advertising	Advertising
Investment, Interest Rate, Floor	1%		1%	1%
Investment, Basis Spread, Variable Rate	5.75%		5.75%	5.75%
Investment Interest Rate	9%		9%	9%
Investment, Acquisition Date	Mar. 11, 2022
Investment Maturity Date	Dec. 15, 2026		Dec. 15, 2026	Dec. 15, 2026
Investment Owned, Balance, Principal Amount	$ 714
Investment Owned, at Cost	702
Investment Owned, at Fair Value	$ 707
Investment, Identifier [Axis]: I&I Sales Group, LLC First Lien Secured Revolving Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:IAndISalesGroupLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember		whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Advertising		Advertising	Advertising
Investment, Interest Rate, Floor	1%		1%	1%
Investment, Basis Spread, Variable Rate	5.75%		5.75%	5.75%
Investment Interest Rate	9.42%		9.42%	9.42%
Investment, Acquisition Date	Feb. 18, 2022
Investment Maturity Date	Dec. 15, 2026		Dec. 15, 2026	Dec. 15, 2026
Investment Owned, at Fair Value	$ 1
Investment, Identifier [Axis]: I&I Sales Group, LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:IAndISalesGroupLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Advertising		Advertising	Advertising
Investment, Interest Rate, Floor	1%		1%	1%
Investment, Basis Spread, Variable Rate	5.75%		5.75%	5.75%
Investment Interest Rate	9.42%		9.42%	9.42%
Investment, Acquisition Date	Feb. 18, 2022
Investment Maturity Date	Dec. 15, 2026		Dec. 15, 2026	Dec. 15, 2026
Investment Owned, Balance, Principal Amount	$ 9,216
Investment Owned, at Cost	9,061
Investment Owned, at Fair Value	$ 9,074
Investment, Identifier [Axis]: IDIG Parent, LLC, First Lien Secured Delayed Draw Loan, Floor 1.00%, Spread L plus 6.00%, Rate 7.00%, Due 12/15/2026
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]		whf:IDIGParentLLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredDelayedDrawLoanMember			whf:FirstLienSecuredDelayedDrawLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Systems Software			Systems Software
Investment, Interest Rate, Floor		1%			1%
Investment, Basis Spread, Variable Rate		6%			6%
Investment Interest Rate		7%			7%
Investment, Acquisition Date		Sep. 21, 2021
Investment Maturity Date		Dec. 15, 2026			Dec. 15, 2026
Investment Owned, Balance, Principal Amount		$ 1,411
Investment Owned, at Cost		1,397
Investment Owned, at Fair Value		$ 1,411
Investment, Identifier [Axis]: IDIG Parent, LLC, First Lien Secured Revolving Loan, Floor 1.00%, Spread L plus 6.00%, Rate 7.00%, Due 12/15/2026
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]		whf:IDIGParentLLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredRevolvingLoanMember			whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Systems Software			Systems Software
Investment, Interest Rate, Floor		1%			1%
Investment, Basis Spread, Variable Rate		6%			6%
Investment Interest Rate		7%			7%
Investment, Acquisition Date		Jun. 25, 2021
Investment Maturity Date		Dec. 15, 2026			Dec. 15, 2026
Investment Owned, at Fair Value		$ 5
Investment, Identifier [Axis]: IDIG Parent, LLC, First Lien Secured Term Loan, Floor 1.00%, Spread L plus 6.00%, Rate 7.00%, Due 12/15/2026
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]		whf:IDIGParentLLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Systems Software			Systems Software
Investment, Interest Rate, Floor		1%			1%
Investment, Basis Spread, Variable Rate		6%			6%
Investment Interest Rate		7%			7%
Investment, Acquisition Date		Jun. 25, 2021
Investment Maturity Date		Dec. 15, 2026			Dec. 15, 2026
Investment Owned, Balance, Principal Amount		$ 8,482
Investment Owned, at Cost		8,404
Investment Owned, at Fair Value		$ 8,482
Investment, Identifier [Axis]: ITS Buyer Inc First Lien Secured Revolving Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]		whf:ITSBuyerIncMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredRevolvingLoanMember			whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Air Freight & Logistics			Air Freight & Logistics
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor		1%			1%
Investment, Basis Spread, Variable Rate		6%			6%
Investment Interest Rate		7%			7%
Investment, Acquisition Date		Dec. 22, 2021
Investment Maturity Date		Jun. 15, 2026			Jun. 15, 2026
Investment, Identifier [Axis]: ITS Buyer Inc First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]		whf:ITSBuyerIncMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Air Freight & Logistics			Air Freight & Logistics
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor		1%			1%
Investment, Basis Spread, Variable Rate		6%			6%
Investment Interest Rate		7%			7%
Investment, Acquisition Date		Dec. 22, 2021
Investment Maturity Date		Jun. 15, 2026			Jun. 15, 2026
Investment Owned, Balance, Principal Amount		$ 3,612
Investment Owned, at Cost		3,540
Investment Owned, at Fair Value		$ 3,539
Investment, Identifier [Axis]: ITS Buyer Inc. First Lien Secured Revolving Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:ITSBuyerIncMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember		whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Air Freight & Logistics		Air Freight & Logistics	Air Freight & Logistics
Investment, Interest Rate, Floor	1%		1%	1%
Investment, Basis Spread, Variable Rate	6%		6%	6%
Investment Interest Rate	9.67%		9.67%	9.67%
Investment, Acquisition Date	Feb. 17, 2022
Investment Maturity Date	Jun. 15, 2026		Jun. 15, 2026	Jun. 15, 2026
Investment Owned, at Fair Value	$ 4
Investment, Identifier [Axis]: ITS Buyer Inc. First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:ITSBuyerIncMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Air Freight & Logistics		Air Freight & Logistics	Air Freight & Logistics
Investment, Interest Rate, Floor	1%		1%	1%
Investment, Basis Spread, Variable Rate	6%		6%	6%
Investment Interest Rate	9.67%		9.67%	9.67%
Investment, Acquisition Date	Feb. 17, 2022
Investment Maturity Date	Jun. 15, 2026		Jun. 15, 2026	Jun. 15, 2026
Investment Owned, Balance, Principal Amount	$ 3,589
Investment Owned, at Cost	3,531
Investment Owned, at Fair Value	$ 3,553
Investment, Identifier [Axis]: ImageOne Industries, LLC Common A Units
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:ImageOneIndustriesLLCMember	whf:ImageOneIndustriesLLCMember
Investment, Type [Extensible Enumeration]	whf:CommonAUnitsMember	whf:CommonAUnitsMember	whf:CommonAUnitsMember	whf:CommonAUnitsMember	whf:CommonAUnitsMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Diversified Support Services	Diversified Support Services	Diversified Support Services	Diversified Support Services	Diversified Support Services
Investment, Acquisition Date	Sep. 20, 2019	Sep. 20, 2019
Investment Owned, Balance, Principal Amount	$ 227	$ 225
Investment Owned, at Cost	2
Investment Owned, at Fair Value	$ 84	$ 158
Investment, Identifier [Axis]: Industrial Specialty Services USA LLC First Lien Secured Revolving Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:IndustrialSpecialtyServicesUSALLCMember	whf:IndustrialSpecialtyServicesUSALLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Environmental & Facilities Services	Environmental & Facilities Services	Environmental & Facilities Services	Environmental & Facilities Services	Environmental & Facilities Services
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor	1%	1%	1%	1%	1%
Investment, Basis Spread, Variable Rate	6.25%	6.25%	6.25%	6.25%	6.25%
Investment Interest Rate	9.18%	7.25%	9.18%	9.18%	7.25%
Investment, Acquisition Date	Dec. 31, 2021	Dec. 31, 2021
Investment Maturity Date	Dec. 31, 2026	Dec. 31, 2026	Dec. 31, 2026	Dec. 31, 2026	Dec. 31, 2026
Investment Owned, Balance, Principal Amount	$ 886
Investment Owned, at Cost	871
Investment Owned, at Fair Value	$ 861
Investment, Identifier [Axis]: Industrial Specialty Services USA LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:IndustrialSpecialtyServicesUSALLCMember	whf:IndustrialSpecialtyServicesUSALLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Environmental & Facilities Services	Environmental & Facilities Services	Environmental & Facilities Services	Environmental & Facilities Services	Environmental & Facilities Services
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor	1%	1%	1%	1%	1%
Investment, Basis Spread, Variable Rate	6.25%	6.25%	6.25%	6.25%	6.25%
Investment Interest Rate	9.92%	7.25%	9.92%	9.92%	7.25%
Investment, Acquisition Date	Dec. 31, 2021	Dec. 31, 2021
Investment Maturity Date	Dec. 31, 2026	Dec. 31, 2026	Dec. 31, 2026	Dec. 31, 2026	Dec. 31, 2026
Investment Owned, Balance, Principal Amount	$ 11,917	$ 12,007
Investment Owned, at Cost	11,715	11,767
Investment Owned, at Fair Value	$ 11,612	$ 11,767
Investment, Identifier [Axis]: Inspired Beauty Brands, Inc First Lien Secured Revolving Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:InspiredBeautyBrandsIncMember	whf:InspiredBeautyBrandsIncMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Personal Products	Personal Products	Personal Products	Personal Products	Personal Products
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor	1%	1%	1%	1%	1%
Investment, Basis Spread, Variable Rate	7%	7%	7%	7%	7%
Investment Interest Rate	9.91%	8%	9.91%	9.91%	8%
Investment, Acquisition Date	Dec. 30, 2020	Dec. 30, 2020
Investment Maturity Date	Dec. 30, 2025	Dec. 30, 2025	Dec. 30, 2025	Dec. 30, 2025	Dec. 30, 2025
Investment Owned, at Fair Value	$ (6)	$ 8
Investment, Identifier [Axis]: Inspired Beauty Brands, Inc First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:InspiredBeautyBrandsIncMember	whf:InspiredBeautyBrandsIncMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Personal Products	Personal Products	Personal Products	Personal Products	Personal Products
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor	1%	1%	1%	1%	1%
Investment, Basis Spread, Variable Rate	7%	7%	7%	7%	7%
Investment Interest Rate	9.91%	8%	9.91%	9.91%	8%
Investment, Acquisition Date	Dec. 30, 2020	Dec. 30, 2020
Investment Maturity Date	Dec. 30, 2025	Dec. 30, 2025	Dec. 30, 2025	Dec. 30, 2025	Dec. 30, 2025
Investment Owned, Balance, Principal Amount	$ 11,804	$ 12,252
Investment Owned, at Cost	11,650	12,055
Investment Owned, at Fair Value	$ 11,509	$ 12,252
Investment, Identifier [Axis]: IvyRehab Intermediate II, LLC First Lien Secured Delayed Draw Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]		whf:IvyRehabIntermediateIILLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredDelayedDrawLoanMember			whf:FirstLienSecuredDelayedDrawLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Health Care Services [Member]			Health Care Services [Member]
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor		1%			1%
Investment, Basis Spread, Variable Rate		6.75%			6.75%
Investment Interest Rate		7.75%			7.75%
Investment, Acquisition Date		Dec. 04, 2020
Investment Maturity Date		Dec. 04, 2024			Dec. 04, 2024
Investment Owned, Balance, Principal Amount		$ 2,550
Investment Owned, at Cost		2,517
Investment Owned, at Fair Value		$ 2,534
Investment, Identifier [Axis]: IvyRehab Intermediate II, LLC First Lien Secured Revolving Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]		whf:IvyRehabIntermediateIILLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredRevolvingLoanMember			whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Health Care Services [Member]			Health Care Services [Member]
Investment, Variable Interest Rate, Type [Extensible Enumeration]		us-gaap:PrimeRateMember			us-gaap:PrimeRateMember
Investment, Interest Rate, Floor		3.25%			3.25%
Investment, Basis Spread, Variable Rate		5.75%			5.75%
Investment Interest Rate		9%			9%
Investment, Acquisition Date		Dec. 04, 2020
Investment Maturity Date		Dec. 04, 2024			Dec. 04, 2024
Investment Owned, Balance, Principal Amount		$ 142
Investment Owned, at Cost		139
Investment Owned, at Fair Value		$ 147
Investment, Identifier [Axis]: IvyRehab Intermediate II, LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]		whf:IvyRehabIntermediateIILLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Health Care Services [Member]			Health Care Services [Member]
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor		1%			1%
Investment, Basis Spread, Variable Rate		6.75%			6.75%
Investment Interest Rate		7.75%			7.75%
Investment, Acquisition Date		Dec. 04, 2020
Investment Maturity Date		Dec. 04, 2024			Dec. 04, 2024
Investment Owned, Balance, Principal Amount		$ 17,366
Investment Owned, at Cost		17,121
Investment Owned, at Fair Value		$ 17,366
Investment, Identifier [Axis]: JVMC Holdings Corp First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:JVMCHoldingsCorpMember	whf:JVMCHoldingsCorpMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Investment Banking & Brokerage	Investment Banking & Brokerage	Investment Banking & Brokerage	Investment Banking & Brokerage	Investment Banking & Brokerage
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor	1%	1%	1%	1%	1%
Investment, Basis Spread, Variable Rate	6.50%	6.75%	6.50%	6.50%	6.75%
Investment Interest Rate	9.62%	7.75%	9.62%	9.62%	7.75%
Investment, Acquisition Date	Feb. 28, 2019	Feb. 28, 2019
Investment Maturity Date	Feb. 28, 2024	Feb. 28, 2024	Feb. 28, 2024	Feb. 28, 2024	Feb. 28, 2024
Investment Owned, Balance, Principal Amount	$ 12,077	$ 12,729
Investment Owned, at Cost	12,043	12,674
Investment Owned, at Fair Value	$ 12,077	$ 12,729
Investment, Identifier [Axis]: JZ Capital Partners Ltd First Lien Secured Delayed Draw Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:JZCapitalPartnersLtdMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredDelayedDrawLoanMember		whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Asset Management And Custody Banks [Member]		Asset Management And Custody Banks [Member]	Asset Management And Custody Banks [Member]
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]		London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor	1%		1%	1%
Investment, Basis Spread, Variable Rate	7%		7%	7%
Investment Interest Rate	9.77%		9.77%	9.77%
Investment, Acquisition Date	Jan. 26, 2022
Investment Maturity Date	Jan. 26, 2027		Jan. 26, 2027	Jan. 26, 2027
Investment Owned, at Fair Value	$ 22
Investment, Identifier [Axis]: JZ Capital Partners Ltd First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:JZCapitalPartnersLtdMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Asset Management And Custody Banks [Member]		Asset Management And Custody Banks [Member]	Asset Management And Custody Banks [Member]
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]		London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor	1%		1%	1%
Investment, Basis Spread, Variable Rate	7%		7%	7%
Investment Interest Rate	9.77%		9.77%	9.77%
Investment, Acquisition Date	Jan. 26, 2022
Investment Maturity Date	Jan. 26, 2027		Jan. 26, 2027	Jan. 26, 2027
Investment Owned, Balance, Principal Amount	$ 10,286
Investment Owned, at Cost	10,108
Investment Owned, at Fair Value	$ 10,147
Investment, Identifier [Axis]: Juniper Landscaping Holdings LLC First Lien Secured Delayed Draw Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]		whf:JuniperLandscapingHoldingsLLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredDelayedDrawLoanMember			whf:FirstLienSecuredDelayedDrawLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Environmental & Facilities Services			Environmental & Facilities Services
Investment, Interest Rate, Floor		1%			1%
Investment, Basis Spread, Variable Rate		6%			6%
Investment Interest Rate		7%			7%
Investment, Acquisition Date		Dec. 29, 2021
Investment Maturity Date		Dec. 29, 2026			Dec. 29, 2026
Investment, Identifier [Axis]: Juniper Landscaping Holdings LLC First Lien Secured Delayed Draw Loan Due 12/29/2026
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:JuniperLandscapingHoldingsLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredDelayedDrawLoanMember		whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Environmental & Facilities Services		Environmental & Facilities Services	Environmental & Facilities Services
Investment, Interest Rate, Floor	1%		1%	1%
Investment, Basis Spread, Variable Rate	6%		6%	6%
Investment Interest Rate	9.67%		9.67%	9.67%
Investment, Acquisition Date	Mar. 01, 2022
Investment Maturity Date	Dec. 29, 2026		Dec. 29, 2026	Dec. 29, 2026
Investment Owned, at Fair Value	$ (3)
Investment, Identifier [Axis]: Juniper Landscaping Holdings LLC First Lien Secured Revolving Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]		whf:JuniperLandscapingHoldingsLLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredRevolvingLoanMember			whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Environmental & Facilities Services			Environmental & Facilities Services
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor		1%			1%
Investment, Basis Spread, Variable Rate		6%			6%
Investment Interest Rate		7%			7%
Investment, Acquisition Date		Dec. 29, 2021
Investment Maturity Date		Dec. 29, 2026			Dec. 29, 2026
Investment Owned, Balance, Principal Amount		$ 597
Investment Owned, at Cost		586
Investment Owned, at Fair Value		$ 586
Investment, Identifier [Axis]: Juniper Landscaping Holdings LLC First Lien Secured Revolving Loan Due 12/29/2026
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:JuniperLandscapingHoldingsLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember		whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Environmental & Facilities Services		Environmental & Facilities Services	Environmental & Facilities Services
Investment, Interest Rate, Floor	1%		1%	1%
Investment, Basis Spread, Variable Rate	6%		6%	6%
Investment Interest Rate	9.67%		9.67%	9.67%
Investment, Acquisition Date	Mar. 01, 2022
Investment Maturity Date	Dec. 29, 2026		Dec. 29, 2026	Dec. 29, 2026
Investment Owned, at Fair Value	$ (1)
Investment, Identifier [Axis]: Juniper Landscaping Holdings LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]		whf:JuniperLandscapingHoldingsLLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Environmental & Facilities Services			Environmental & Facilities Services
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor		1%			1%
Investment, Basis Spread, Variable Rate		6%			6%
Investment Interest Rate		7%			7%
Investment, Acquisition Date		Dec. 29, 2021
Investment Maturity Date		Dec. 29, 2026			Dec. 29, 2026
Investment Owned, Balance, Principal Amount		$ 11,420
Investment Owned, at Cost		11,221
Investment Owned, at Fair Value		$ 11,220
Investment, Identifier [Axis]: Juniper Landscaping Holdings LLC First Lien Secured Term Loan Due 12/29/2026
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:JuniperLandscapingHoldingsLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Environmental & Facilities Services		Environmental & Facilities Services	Environmental & Facilities Services
Investment, Interest Rate, Floor	1%		1%	1%
Investment, Basis Spread, Variable Rate	6%		6%	6%
Investment Interest Rate	9.67%		9.67%	9.67%
Investment, Acquisition Date	Mar. 01, 2022
Investment Maturity Date	Dec. 29, 2026		Dec. 29, 2026	Dec. 29, 2026
Investment Owned, Balance, Principal Amount	$ 11,334
Investment Owned, at Cost	11,165
Investment Owned, at Fair Value	$ 11,151
Investment, Identifier [Axis]: Keras Holdings, LLC Shares
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:KerasHoldingsLLCMember	whf:KerasHoldingsLLCMember
Investment, Type [Extensible Enumeration]	Common Stock [Member]	Common Stock [Member]	Common Stock [Member]	Common Stock [Member]	Common Stock [Member]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	IT Consulting And Other Services	IT Consulting And Other Services	IT Consulting And Other Services	IT Consulting And Other Services	IT Consulting And Other Services
Investment, Acquisition Date	Dec. 31, 2020	Dec. 31, 2020
Investment Owned, Balance, Principal Amount	$ 496	$ 496
Investment Owned, at Cost	496	496
Investment Owned, at Fair Value	$ 361	$ 496
Investment, Identifier [Axis]: LHS Borrower, LLC First Lien Secured Revolving Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]		whf:LHSBorrowerLLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredRevolvingLoanMember			whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Building Products			Building Products
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor		1%			1%
Investment, Basis Spread, Variable Rate		6.75%			6.75%
Investment Interest Rate		7.75%			7.75%
Investment, Acquisition Date		Sep. 30, 2020
Investment Maturity Date		Sep. 30, 2025			Sep. 30, 2025
Investment Owned, at Fair Value		$ 4
Investment, Identifier [Axis]: LHS Borrower, LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]		whf:LHSBorrowerLLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Building Products			Building Products
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor		1%			1%
Investment, Basis Spread, Variable Rate		6.75%			6.75%
Investment Interest Rate		7.75%			7.75%
Investment, Acquisition Date		Sep. 30, 2020
Investment Maturity Date		Sep. 30, 2025			Sep. 30, 2025
Investment Owned, Balance, Principal Amount		$ 9,506
Investment Owned, at Cost		9,346
Investment Owned, at Fair Value		$ 9,416
Investment, Identifier [Axis]: LHS Borrower, LLC, First Lien Secured Revolving Loan, Floor 1.00%, Spread L plus 6.75%, Rate 7.75%, Due 9/30/2025
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]		whf:LHSBorrowerLLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredRevolvingLoanMember			whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Building Products			Building Products
Investment, Interest Rate, Floor		1%			1%
Investment, Basis Spread, Variable Rate		6.75%			6.75%
Investment Interest Rate		7.75%			7.75%
Investment, Acquisition Date		Oct. 09, 2020
Investment Maturity Date		Sep. 30, 2025			Sep. 30, 2025
Investment Owned, at Fair Value		$ 4
Investment, Identifier [Axis]: LHS Borrower, LLC, First Lien Secured Term Loan, Floor 1.00%, Spread L plus 6.75%, Rate 7.75%, Due 9/30/2025
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]		whf:LHSBorrowerLLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Building Products			Building Products
Investment, Interest Rate, Floor		1%			1%
Investment, Basis Spread, Variable Rate		6.75%			6.75%
Investment Interest Rate		7.75%			7.75%
Investment, Acquisition Date		Oct. 09, 2020
Investment Maturity Date		Sep. 30, 2025			Sep. 30, 2025
Investment Owned, Balance, Principal Amount		$ 9,506
Investment Owned, at Cost		9,345
Investment Owned, at Fair Value		$ 9,416
Investment, Identifier [Axis]: LINC Systems LLC First Lien Secured Revolving Loan Floor 1.00 Libor Plus 6.25 Rate Due 2242026
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:LINCSystemsLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember		whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Trading Companies & Distributors		Trading Companies & Distributors	Trading Companies & Distributors
Investment, Interest Rate, Floor	1%		1%	1%
Investment, Basis Spread, Variable Rate	6.25%		6.25%	6.25%
Investment Interest Rate	10.33%		10.33%	10.33%
Investment, Acquisition Date	Jun. 22, 2021
Investment Maturity Date	Feb. 24, 2026		Feb. 24, 2026	Feb. 24, 2026
Investment Owned, at Fair Value	$ 10
Investment, Identifier [Axis]: LINC Systems LLC First Lien Secured Term Loan Floor 1.00 Libor Plus 6.25 Rate Due 2242026
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:LINCSystemsLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Trading Companies & Distributors		Trading Companies & Distributors	Trading Companies & Distributors
Investment, Interest Rate, Floor	1%		1%	1%
Investment, Basis Spread, Variable Rate	6.25%		6.25%	6.25%
Investment Interest Rate	10.33%		10.33%	10.33%
Investment, Acquisition Date	Jun. 22, 2021
Investment Maturity Date	Feb. 24, 2026		Feb. 24, 2026	Feb. 24, 2026
Investment Owned, Balance, Principal Amount	$ 10,058
Investment Owned, at Cost	9,909
Investment Owned, at Fair Value	$ 10,058
Investment, Identifier [Axis]: LINC Systems, LLC, First Lien Secured Delayed Draw Loan, Floor 1.50%, Spread L plus 6.25%, Rate 7.25%, Due 2/24/2026
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]		whf:LINCSystemsLLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Technology Hardware, Storage & Peripherals			Technology Hardware, Storage & Peripherals
Investment, Interest Rate, Floor		1%			1%
Investment, Basis Spread, Variable Rate		6.25%			6.25%
Investment Interest Rate		7.25%			7.25%
Investment, Acquisition Date		Jun. 22, 2021
Investment Maturity Date		Feb. 24, 2026			Feb. 24, 2026
Investment Owned, Balance, Principal Amount		$ 10,135
Investment Owned, at Cost		9,951
Investment Owned, at Fair Value		$ 10,101
Investment, Identifier [Axis]: LINC Systems, LLC, First Lien Secured Revolving Loan, Floor 1.50%, Spread L plus 6.25%, Rate 7.25%, Due 2/24/2026
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]		whf:LINCSystemsLLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredRevolvingLoanMember			whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Technology Hardware, Storage & Peripherals			Technology Hardware, Storage & Peripherals
Investment, Interest Rate, Floor		1%			1%
Investment, Basis Spread, Variable Rate		6.25%			6.25%
Investment Interest Rate		7.25%			7.25%
Investment, Acquisition Date		Jun. 22, 2021
Investment Maturity Date		Feb. 24, 2026			Feb. 24, 2026
Investment Owned, at Fair Value		$ 12
Investment, Identifier [Axis]: LMG Holdings, Inc First Lien Secured Revolving Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]		whf:LMGHoldingsIncMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredRevolvingLoanMember			whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Electronic Equipment & Instruments			Electronic Equipment & Instruments
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor		1%			1%
Investment, Basis Spread, Variable Rate		6.50%			6.50%
Investment Interest Rate		7.50%			7.50%
Investment, Acquisition Date		Apr. 30, 2021
Investment Maturity Date		Apr. 30, 2026			Apr. 30, 2026
Investment, Identifier [Axis]: LMG Holdings, Inc First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]		whf:LMGHoldingsIncMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Electronic Equipment & Instruments			Electronic Equipment & Instruments
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor		1%			1%
Investment, Basis Spread, Variable Rate		6.50%			6.50%
Investment Interest Rate		7.50%			7.50%
Investment, Acquisition Date		Apr. 30, 2021
Investment Maturity Date		Apr. 30, 2026			Apr. 30, 2026
Investment Owned, Balance, Principal Amount		$ 6,802
Investment Owned, at Cost		6,684
Investment Owned, at Fair Value		$ 6,687
Investment, Identifier [Axis]: LMG Holdings, Inc., First Lien Secured Revolving Loan, Floor 1.00%, Spread L plus 6.50%, Rate 7.50%, Due 4/30/2026
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:LMGHoldingsIncMember	whf:LMGHoldingsIncMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Electronic Equipment & Instruments	Electronic Equipment & Instruments	Electronic Equipment & Instruments	Electronic Equipment & Instruments	Electronic Equipment & Instruments
Investment, Interest Rate, Floor	1%	1%	1%	1%	1%
Investment, Basis Spread, Variable Rate	7%	6.50%	7%	7%	6.50%
Investment Interest Rate	10.09%	7.50%	10.09%	10.09%	7.50%
Investment, Acquisition Date	Jun. 28, 2021	Jun. 28, 2021
Investment Maturity Date	Apr. 30, 2026	Apr. 30, 2026	Apr. 30, 2026	Apr. 30, 2026	Apr. 30, 2026
Investment Owned, Balance, Principal Amount	$ 265
Investment Owned, at Cost	261
Investment Owned, at Fair Value	$ 256
Investment, Identifier [Axis]: LMG Holdings, Inc., First Lien Secured Term Loan, Floor 1.00%, Spread L plus 6.50%, Rate 7.50%, Due 4/30/2026
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:LMGHoldingsIncMember	whf:LMGHoldingsIncMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Electronic Equipment & Instruments	Electronic Equipment & Instruments	Electronic Equipment & Instruments	Electronic Equipment & Instruments	Electronic Equipment & Instruments
Investment, Interest Rate, Floor	1%	1%	1%	1%	1%
Investment, Basis Spread, Variable Rate	7%	6.50%	7%	7%	6.50%
Investment Interest Rate	10.67%	7.50%	10.67%	10.67%	7.50%
Investment, Acquisition Date	Jun. 28, 2021	Jun. 28, 2021
Investment Maturity Date	Apr. 30, 2026	Apr. 30, 2026	Apr. 30, 2026	Apr. 30, 2026	Apr. 30, 2026
Investment Owned, Balance, Principal Amount	$ 13,501	$ 6,802
Investment Owned, at Cost	13,303	6,680
Investment Owned, at Fair Value	$ 13,229	$ 6,687
Investment, Identifier [Axis]: LSCS Holdings, Inc Second Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:LSCSHoldingsIncMember	whf:LSCSHoldingsIncMember
Investment, Type [Extensible Enumeration]	whf:SecondLienSecuredTermLoanMember	whf:SecondLienSecuredTermLoanMember	whf:SecondLienSecuredTermLoanMember	whf:SecondLienSecuredTermLoanMember	whf:SecondLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Life Sciences Tools And Services [Member]	Life Sciences Tools And Services [Member]	Life Sciences Tools And Services [Member]	Life Sciences Tools And Services [Member]	Life Sciences Tools And Services [Member]
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor	0.50%	0.50%	0.50%	0.50%	0.50%
Investment, Basis Spread, Variable Rate	8%	8%	8%	8%	8%
Investment Interest Rate	11.67%	8.50%	11.67%	11.67%	8.50%
Investment, Acquisition Date	Nov. 23, 2021	Nov. 23, 2021
Investment Maturity Date	Dec. 16, 2029	Dec. 16, 2029	Dec. 16, 2029	Dec. 16, 2029	Dec. 16, 2029
Investment Owned, Balance, Principal Amount	$ 5,000	$ 5,000
Investment Owned, at Cost	4,932	4,925
Investment Owned, at Fair Value	$ 4,912	$ 4,925
Investment, Identifier [Axis]: Lab Logistics, LLC First Lien Secured Delayed Draw Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:LabLogisticsLLCMember	whf:LabLogisticsLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Health Care Services [Member]	Health Care Services [Member]	Health Care Services [Member]	Health Care Services [Member]	Health Care Services [Member]
Investment, Variable Interest Rate, Type [Extensible Enumeration]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	London Interbank Offered Rate (LIBOR) [Member]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor	1%	1%	1%	1%	1%
Investment, Basis Spread, Variable Rate	7.25%	7.25%	7.25%	7.25%	7.25%
Investment Interest Rate	10.20%	8.25%	10.20%	10.20%	8.25%
Investment, Acquisition Date	Oct. 16, 2019	Oct. 16, 2019
Investment Maturity Date	Sep. 25, 2023	Sep. 25, 2023	Sep. 25, 2023	Sep. 25, 2023	Sep. 25, 2023
Investment Owned, Balance, Principal Amount	$ 5,144	$ 5,183
Investment Owned, at Cost	5,135	5,166
Investment Owned, at Fair Value	$ 5,144	$ 5,183
Investment, Identifier [Axis]: Lab Logistics, LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:LabLogisticsLLCMember	whf:LabLogisticsLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Health Care Services [Member]	Health Care Services [Member]	Health Care Services [Member]	Health Care Services [Member]	Health Care Services [Member]
Investment, Variable Interest Rate, Type [Extensible Enumeration]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	London Interbank Offered Rate (LIBOR) [Member]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor	1%	1%	1%	1%	1%
Investment, Basis Spread, Variable Rate	7.25%	7.25%	7.25%	7.25%	7.25%
Investment Interest Rate	10.16%	8.25%	10.16%	10.16%	8.25%
Investment, Acquisition Date	Oct. 16, 2019	Oct. 16, 2019
Investment Maturity Date	Sep. 25, 2023	Sep. 25, 2023	Sep. 25, 2023	Sep. 25, 2023	Sep. 25, 2023
Investment Owned, Balance, Principal Amount	$ 5,501	$ 1,155
Investment Owned, at Cost	5,446	1,140
Investment Owned, at Fair Value	$ 5,495	$ 1,155
Investment, Identifier [Axis]: Lab Logistics, LLC Preferred Units
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]		whf:LabLogisticsLLCMember
Investment, Type [Extensible Enumeration]		whf:PreferredUnitsMember			whf:PreferredUnitsMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Health Care Services [Member]			Health Care Services [Member]
Investment, Basis Spread, Variable Rate		14%			14%
Investment, Acquisition Date		Oct. 29, 2019
Investment Owned, Balance, Principal Amount		$ 2
Investment Owned, at Cost		857
Investment Owned, at Fair Value		$ 1,018
Investment, Interest Rate, Paid in Kind		14%			14%
Investment, Identifier [Axis]: Lenny & Larry's, LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:LennyLarrysLLCMember	whf:LennyLarrysLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Packaged Foods & Meats	Packaged Foods & Meats	Packaged Foods & Meats	Packaged Foods & Meats	Packaged Foods & Meats
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor	1%	1%	1%	1%	1%
Investment, Basis Spread, Variable Rate	8.92%	8.40%	8.92%	8.92%	8.40%
Investment Interest Rate	11.74%	9.40%	11.74%	11.74%	9.40%
Investment, Acquisition Date	May 15, 2018	May 15, 2018
Investment Maturity Date	May 15, 2023	May 15, 2023	May 15, 2023	May 15, 2023	May 15, 2023
Investment Owned, Balance, Principal Amount	$ 11,201	$ 11,142
Investment Owned, at Cost	11,175	11,084
Investment Owned, at Fair Value	$ 10,922	$ 10,862
Investment, Interest Rate, Paid in Kind	1.71%	1.72%	1.71%	1.71%	1.72%
Investment, Interest Rate, Paid in Cash	10.03%	7.68%	10.03%	10.03%	7.68%
Investment, Identifier [Axis]: Lift Brands, Inc First Lien Secured Term Loan A
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:LiftBrandsIncMember	whf:LiftBrandsIncMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanAMember	whf:FirstLienSecuredTermLoanAMember	whf:FirstLienSecuredTermLoanAMember	whf:FirstLienSecuredTermLoanAMember	whf:FirstLienSecuredTermLoanAMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Leisure Facilities [Member]	Leisure Facilities [Member]	Leisure Facilities [Member]	Leisure Facilities [Member]	Leisure Facilities [Member]
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor	1%	1%	1%	1%	1%
Investment, Basis Spread, Variable Rate	7.50%	7.50%	7.50%	7.50%	7.50%
Investment Interest Rate	10.62%	8.50%	10.62%	10.62%	8.50%
Investment, Acquisition Date	Jun. 29, 2020	Jun. 29, 2020
Investment Maturity Date	Jun. 29, 2025	Jun. 29, 2025	Jun. 29, 2025	Jun. 29, 2025	Jun. 29, 2025
Investment Owned, Balance, Principal Amount	$ 5,588	$ 5,631
Investment Owned, at Cost	5,541	5,570
Investment Owned, at Fair Value	$ 5,533	$ 5,546
Investment, Identifier [Axis]: Lift Brands, Inc First Lien Secured Term Loan B
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:LiftBrandsIncMember	whf:LiftBrandsIncMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanBMember	whf:FirstLienSecuredTermLoanBMember	whf:FirstLienSecuredTermLoanBMember	whf:FirstLienSecuredTermLoanBMember	whf:FirstLienSecuredTermLoanBMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Leisure Facilities [Member]	Leisure Facilities [Member]	Leisure Facilities [Member]	Leisure Facilities [Member]	Leisure Facilities [Member]
Investment, Basis Spread, Variable Rate	9.50%	9.50%	9.50%	9.50%	9.50%
Investment Interest Rate	9.50%	9.50%	9.50%	9.50%	9.50%
Investment, Acquisition Date	Jun. 29, 2020	Jun. 29, 2020
Investment Maturity Date	Jun. 29, 2025	Jun. 29, 2025	Jun. 29, 2025	Jun. 29, 2025	Jun. 29, 2025
Investment Owned, Balance, Principal Amount	$ 1,330	$ 1,279
Investment Owned, at Cost	1,314	1,259
Investment Owned, at Fair Value	$ 1,302	$ 1,239
Investment, Interest Rate, Paid in Kind	9.50%	9.50%	9.50%	9.50%	9.50%
Investment, Interest Rate, Paid in Cash	0%	0%	0%	0%	0%
Investment, Identifier [Axis]: Luxury Brand Holdings, Inc First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:LuxuryBrandHoldingsIncMember	whf:LuxuryBrandHoldingsIncMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Internet & Direct Marketing Retail	Internet & Direct Marketing Retail	Internet & Direct Marketing Retail	Internet & Direct Marketing Retail	Internet & Direct Marketing Retail
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor	1%	1%	1%	1%	1%
Investment, Basis Spread, Variable Rate	6.50%	6.50%	6.50%	6.50%	6.50%
Investment Interest Rate	9.31%	7.50%	9.31%	9.31%	7.50%
Investment, Acquisition Date	Dec. 04, 2020	Dec. 04, 2020
Investment Maturity Date	Jun. 04, 2026	Jun. 04, 2026	Jun. 04, 2026	Jun. 04, 2026	Jun. 04, 2026
Investment Owned, Balance, Principal Amount	$ 5,895	$ 5,940
Investment Owned, at Cost	5,816	5,844
Investment Owned, at Fair Value	$ 5,854	$ 5,940
Investment, Identifier [Axis]: MEP-TS Midco, LLC, First Lien Secured Revolving Loan, Floor 1.00%, Spread L plus 6.00%, Rate 7.00%, Due 12/31/2026
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:MEP-TSMidcoLLCMember	whf:MEP-TSMidcoLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Application Software	Application Software	Application Software	Application Software	Application Software
Investment, Interest Rate, Floor	1%	1%	1%	1%	1%
Investment, Basis Spread, Variable Rate	6%	6%	6%	6%	6%
Investment Interest Rate	8.88%	7%	8.88%	8.88%	7%
Investment, Acquisition Date	Jan. 21, 2021	Jan. 21, 2021
Investment Maturity Date	Dec. 31, 2026	Dec. 31, 2026	Dec. 31, 2026	Dec. 31, 2026	Dec. 31, 2026
Investment Owned, at Fair Value	$ 24	$ 28
Investment, Identifier [Axis]: MEP-TS Midco, LLC, First Lien Secured Term Loan, Floor 1.00%, Spread L plus 6.00%, Rate 7.00%, Due 12/31/2026
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:MEP-TSMidcoLLCMember	whf:MEP-TSMidcoLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Application Software	Application Software	Application Software	Application Software	Application Software
Investment, Interest Rate, Floor	1%	1%	1%	1%	1%
Investment, Basis Spread, Variable Rate	6%	6%	6%	6%	6%
Investment Interest Rate	8.88%	7%	8.88%	8.88%	7%
Investment, Acquisition Date	Jan. 21, 2021	Jan. 21, 2021
Investment Maturity Date	Dec. 31, 2026	Dec. 31, 2026	Dec. 31, 2026	Dec. 31, 2026	Dec. 31, 2026
Investment Owned, Balance, Principal Amount	$ 13,387	$ 13,490
Investment Owned, at Cost	13,183	13,247
Investment Owned, at Fair Value	$ 13,387	$ 13,490
Investment, Identifier [Axis]: MSI Information Services, Inc First Lien Secured Revolving Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:MSIInformationServicesIncMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember		whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Interactive Media And Services [Member]		Interactive Media And Services [Member]	Interactive Media And Services [Member]
Investment, Variable Interest Rate, Type [Extensible Enumeration]	us-gaap:BaseRateMember		us-gaap:BaseRateMember	us-gaap:BaseRateMember
Investment, Interest Rate, Floor	1%		1%	1%
Investment, Basis Spread, Variable Rate	6.75%		6.75%	6.75%
Investment Interest Rate	13%		13%	13%
Investment, Acquisition Date	Apr. 25, 2022
Investment Maturity Date	Apr. 24, 2026		Apr. 24, 2026	Apr. 24, 2026
Investment Owned, Balance, Principal Amount	$ 300
Investment Owned, at Cost	295
Investment Owned, at Fair Value	$ 286
Investment, Identifier [Axis]: MSI Information Services, Inc First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:MSIInformationServicesIncMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Interactive Media And Services [Member]		Interactive Media And Services [Member]	Interactive Media And Services [Member]
Investment, Variable Interest Rate, Type [Extensible Enumeration]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]		Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
Investment, Interest Rate, Floor	1%		1%	1%
Investment, Basis Spread, Variable Rate	7.75%		7.75%	7.75%
Investment Interest Rate	10.88%		10.88%	10.88%
Investment, Acquisition Date	Apr. 25, 2022
Investment Maturity Date	Apr. 24, 2026		Apr. 24, 2026	Apr. 24, 2026
Investment Owned, Balance, Principal Amount	$ 7,851
Investment Owned, at Cost	7,711
Investment Owned, at Fair Value	$ 7,647
Investment, Identifier [Axis]: Manchester Acquisition Sub LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:ManchesterAcquisitionSubLLCMember	whf:ManchesterAcquisitionSubLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Diversified Chemicals [Member]	Diversified Chemicals [Member]	Diversified Chemicals [Member]	Diversified Chemicals [Member]	Diversified Chemicals [Member]
Investment, Variable Interest Rate, Type [Extensible Enumeration]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	whf:SecuredOvernightFinancingRateMember	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	whf:SecuredOvernightFinancingRateMember
Investment, Interest Rate, Floor	0.75%	0.75%	0.75%	0.75%	0.75%
Investment, Basis Spread, Variable Rate	5.75%	5.75%	5.75%	5.75%	5.75%
Investment Interest Rate	8.85%	6.50%	8.85%	8.85%	6.50%
Investment, Acquisition Date	Nov. 16, 2021	Nov. 16, 2021
Investment Maturity Date	Nov. 16, 2026	Nov. 16, 2026	Nov. 16, 2026	Nov. 16, 2026	Nov. 16, 2026
Investment Owned, Balance, Principal Amount	$ 7,940	$ 12,000
Investment Owned, at Cost	7,575	11,348
Investment Owned, at Fair Value	$ 7,246	$ 11,340
Investment, Identifier [Axis]: Marlin DTC-LS Midco 2, LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]		whf:MarlinDTC-LSMidco2LLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Internet & Direct Marketing Retail			Internet & Direct Marketing Retail
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor		1%			1%
Investment, Basis Spread, Variable Rate		6.50%			6.50%
Investment Interest Rate		7.50%			7.50%
Investment, Acquisition Date		Aug. 06, 2021
Investment Maturity Date		Jul. 01, 2025			Jul. 01, 2025
Investment Owned, Balance, Principal Amount		$ 4,277
Investment Owned, at Cost		4,200
Investment Owned, at Fair Value		$ 4,206
Investment, Identifier [Axis]: Marlin DTC-LS Midco 2, LLC, First Lien Secured Revolving Loan, Floor 1.00%, Spread L plus 6.50%, Rate 7.50%, Due 7/1/2025
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:MarlinDTC-LSMidco2LLCMember	whf:MarlinDTC-LSMidco2LLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Internet & Direct Marketing Retail	Internet & Direct Marketing Retail	Internet & Direct Marketing Retail	Internet & Direct Marketing Retail	Internet & Direct Marketing Retail
Investment, Interest Rate, Floor	1%	1%	1%	1%	1%
Investment, Basis Spread, Variable Rate	6.50%	6.50%	6.50%	6.50%	6.50%
Investment Interest Rate	9.57%	7.50%	9.57%	9.57%	7.50%
Investment, Acquisition Date	Jul. 19, 2019	Jul. 19, 2019
Investment Maturity Date	Jul. 01, 2025	Jul. 01, 2025	Jul. 01, 2025	Jul. 01, 2025	Jul. 01, 2025
Investment Owned, at Fair Value	$ 9	$ 11
Investment, Identifier [Axis]: Marlin DTC-LS Midco 2, LLC, First Lien Secured Term Loan, Floor 1.00%, Spread L plus 6.50%, Rate 7.50%, Due 7/1/2025
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:MarlinDTC-LSMidco2LLCMember	whf:MarlinDTC-LSMidco2LLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Internet & Direct Marketing Retail	Internet & Direct Marketing Retail	Internet & Direct Marketing Retail	Internet & Direct Marketing Retail	Internet & Direct Marketing Retail
Investment, Interest Rate, Floor	1%	1%	1%	1%	1%
Investment, Basis Spread, Variable Rate	6.50%	6.50%	6.50%	6.50%	6.50%
Investment Interest Rate	9.57%	7.50%	9.57%	9.57%	7.50%
Investment, Acquisition Date	Jul. 19, 2019	Jul. 19, 2019
Investment Maturity Date	Jul. 01, 2025	Jul. 01, 2025	Jul. 01, 2025	Jul. 01, 2025	Jul. 01, 2025
Investment Owned, Balance, Principal Amount	$ 19,105	$ 15,342
Investment Owned, at Cost	18,901	15,153
Investment Owned, at Fair Value	$ 19,105	$ 15,342
Investment, Identifier [Axis]: Max Solutions Inc. Common Stock
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	Max Solutions Inc
Investment, Type [Extensible Enumeration]	Common Stock [Member]		Common Stock [Member]	Common Stock [Member]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Paper Packaging		Paper Packaging	Paper Packaging
Investment, Acquisition Date	Sep. 29, 2022
Investment Owned, Balance, Principal Amount	$ 4
Investment Owned, at Cost	400
Investment Owned, at Fair Value	$ 400
Investment, Identifier [Axis]: Max Solutions Inc. First Lien Secured Delayed Draw Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:LennyLarrysLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredDelayedDrawLoanMember		whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Paper Packaging		Paper Packaging	Paper Packaging
Investment, Variable Interest Rate, Type [Extensible Enumeration]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]		Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
Investment, Interest Rate, Floor	1%		1%	1%
Investment, Basis Spread, Variable Rate	6.50%		6.50%	6.50%
Investment Interest Rate	10.21%		10.21%	10.21%
Investment, Acquisition Date	Sep. 29, 2022
Investment Maturity Date	Sep. 29, 2028		Sep. 29, 2028	Sep. 29, 2028
Investment, Identifier [Axis]: Max Solutions Inc. First Lien Secured Revolving Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:LennyLarrysLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember		whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Paper Packaging		Paper Packaging	Paper Packaging
Investment, Variable Interest Rate, Type [Extensible Enumeration]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]		Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
Investment, Interest Rate, Floor	1%		1%	1%
Investment, Basis Spread, Variable Rate	6.50%		6.50%	6.50%
Investment Interest Rate	10.21%		10.21%	10.21%
Investment, Acquisition Date	Sep. 29, 2022
Investment Maturity Date	Sep. 29, 2028		Sep. 29, 2028	Sep. 29, 2028
Investment, Identifier [Axis]: Max Solutions Inc. First Lien Secured Revolving Loan CAD
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:LennyLarrysLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember		whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Paper Packaging		Paper Packaging	Paper Packaging
Investment, Variable Interest Rate, Type [Extensible Enumeration]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]		Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
Investment, Interest Rate, Floor	1%		1%	1%
Investment, Basis Spread, Variable Rate	6.50%		6.50%	6.50%
Investment Interest Rate	10.21%		10.21%	10.21%
Investment, Acquisition Date	Sep. 29, 2022
Investment Maturity Date	Sep. 29, 2028		Sep. 29, 2028	Sep. 29, 2028
Investment, Identifier [Axis]: Max Solutions Inc. First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:LennyLarrysLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Industry Sector [Extensible Enumeration]	Paper Packaging		Paper Packaging	Paper Packaging
Investment, Variable Interest Rate, Type [Extensible Enumeration]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]		Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
Investment, Interest Rate, Floor	1%		1%	1%
Investment, Basis Spread, Variable Rate	6.50%		6.50%	6.50%
Investment Interest Rate	10.21%		10.21%	10.21%
Investment, Acquisition Date	Sep. 29, 2022
Investment Maturity Date	Sep. 29, 2028		Sep. 29, 2028	Sep. 29, 2028
Investment Owned, Balance, Principal Amount	$ 8,264
Investment Owned, at Cost	8,099
Investment Owned, at Fair Value	$ 8,099
Investment, Identifier [Axis]: Maxitransfers Blocker Corp First Lien Secured Revolving Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]		whf:MaxitransfersBlockerCorpMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredRevolvingLoanMember			whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Consumer Finance [Member]			Consumer Finance [Member]
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor		1%			1%
Investment, Basis Spread, Variable Rate		8.50%			8.50%
Investment Interest Rate		9.50%			9.50%
Investment, Acquisition Date		Oct. 07, 2020
Investment Maturity Date		Oct. 07, 2025			Oct. 07, 2025
Investment Owned, Balance, Principal Amount		$ 1,038
Investment Owned, at Cost		1,019
Investment Owned, at Fair Value		$ 1,038
Investment, Identifier [Axis]: Maxitransfers Blocker Corp First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]		whf:MaxitransfersBlockerCorpMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Consumer Finance [Member]			Consumer Finance [Member]
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor		1%			1%
Investment, Basis Spread, Variable Rate		8.50%			8.50%
Investment Interest Rate		9.50%			9.50%
Investment, Acquisition Date		Oct. 07, 2020
Investment Maturity Date		Oct. 07, 2025			Oct. 07, 2025
Investment Owned, Balance, Principal Amount		$ 8,590
Investment Owned, at Cost		8,436
Investment Owned, at Fair Value		$ 8,590
Investment, Identifier [Axis]: Meta Buyer LLC, First Lien Secured Delayed Draw Loan, Floor 1.00%, Spread L plus 6.00%, Rate 7.97%, Due 11/1/2027
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:MetaBuyerLLCMember	whf:MetaBuyerLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Pharmaceuticals	Personal Products	Pharmaceuticals	Pharmaceuticals	Personal Products
Investment, Interest Rate, Floor	1%	1%	1%	1%	1%
Investment, Basis Spread, Variable Rate	6%	6%	6%	6%	6%
Investment Interest Rate	9.52%	7%	9.52%	9.52%	7%
Investment, Acquisition Date	Dec. 16, 2021	Dec. 16, 2021
Investment Maturity Date	Nov. 01, 2027	Nov. 01, 2027	Nov. 01, 2027	Nov. 01, 2027	Nov. 01, 2027
Investment Owned, Balance, Principal Amount	$ 897
Investment Owned, at Cost	881
Investment Owned, at Fair Value	$ 885
Investment, Identifier [Axis]: Meta Buyer LLC, First Lien Secured Revolving Loan, Floor 1.00%, Spread L plus 6.00%, Rate 7.97%, Due 11/1/2027
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:MetaBuyerLLCMember	whf:MetaBuyerLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Pharmaceuticals	Personal Products	Pharmaceuticals	Pharmaceuticals	Personal Products
Investment, Interest Rate, Floor	1%	1%	1%	1%	1%
Investment, Basis Spread, Variable Rate	6%	6%	6%	6%	6%
Investment Interest Rate	8.80%	7%	8.80%	8.80%	7%
Investment, Acquisition Date	Dec. 16, 2021	Dec. 16, 2021
Investment Maturity Date	Nov. 01, 2027	Nov. 01, 2027	Nov. 01, 2027	Nov. 01, 2027	Nov. 01, 2027
Investment Owned, Balance, Principal Amount		$ 251
Investment Owned, at Cost		246
Investment Owned, at Fair Value	$ 6	$ 246
Investment, Identifier [Axis]: Meta Buyer LLC, First lien Secured Term Loan, Floor 1.00%, Spread E plus 6.00%, Rate 7.00%, Due 11/1/2027
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:MetaBuyerLLCMember	whf:MetaBuyerLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Pharmaceuticals	Personal Products	Pharmaceuticals	Pharmaceuticals	Personal Products
Investment, Interest Rate, Floor	1%	1%	1%	1%	1%
Investment, Basis Spread, Variable Rate	6%	6%	6%	6%	6%
Investment Interest Rate	7%	7%	7%	7%	7%
Investment, Acquisition Date	Dec. 16, 2021	Dec. 16, 2021
Investment Maturity Date	Nov. 01, 2027	Nov. 01, 2027	Nov. 01, 2027	Nov. 01, 2027	Nov. 01, 2027
Investment Owned, Balance, Principal Amount	$ 12,318	$ 12,411
Investment Owned, at Cost	13,664	13,737
Investment Owned, at Fair Value	$ 11,844	$ 13,843
Investment, Identifier [Axis]: Meta Buyer LLC, First lien Secured Term Loan, Floor 1.00%, Spread L plus 6.00%, Rate 7.33%, Due 11/1/2027
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:MetaBuyerLLCMember	whf:MetaBuyerLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Pharmaceuticals	Personal Products	Pharmaceuticals	Pharmaceuticals	Personal Products
Investment, Interest Rate, Floor	1%	1%	1%	1%	1%
Investment, Basis Spread, Variable Rate	6%	6%	6%	6%	6%
Investment Interest Rate	8.80%	7%	8.80%	8.80%	7%
Investment, Acquisition Date	Dec. 16, 2021	Dec. 16, 2021
Investment Maturity Date	Nov. 01, 2027	Nov. 01, 2027	Nov. 01, 2027	Nov. 01, 2027	Nov. 01, 2027
Investment Owned, Balance, Principal Amount	$ 984	$ 991
Investment Owned, at Cost	967	972
Investment Owned, at Fair Value	$ 971	$ 972
Investment, Identifier [Axis]: Mikawaya Holdings, LLC, First Lien Secured Term Loan, Floor 1.25%, Spread L plus 5.50%, Rate 6.75%, Due 1/29/2025
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]		whf:MikawayaHoldingsLLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Packaged Foods & Meats			Packaged Foods & Meats
Investment, Interest Rate, Floor		1.25%			1.25%
Investment, Basis Spread, Variable Rate		5.50%			5.50%
Investment Interest Rate		6.75%			6.75%
Investment, Acquisition Date		Feb. 18, 2020
Investment Maturity Date		Jan. 29, 2025			Jan. 29, 2025
Investment Owned, Balance, Principal Amount		$ 3,026
Investment Owned, at Cost		2,988
Investment Owned, at Fair Value		$ 3,026
Investment, Identifier [Axis]: Mills Fleet Farm Group, LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]		whf:MillsFleetFarmGroupLLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Department Stores [Member]			Department Stores [Member]
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor		1%			1%
Investment, Basis Spread, Variable Rate		6.25%			6.25%
Investment Interest Rate		7.25%			7.25%
Investment, Acquisition Date		Oct. 24, 2018
Investment Maturity Date		Oct. 24, 2024			Oct. 24, 2024
Investment Owned, Balance, Principal Amount		$ 13,538
Investment Owned, at Cost		13,331
Investment Owned, at Fair Value		$ 13,538
Investment, Identifier [Axis]: Motivational CIV, LLC Class B Units
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:MotivationalCIVLLCMember	whf:MotivationalCIVLLCMember
Investment, Type [Extensible Enumeration]	whf:ClassBUnitsMember	whf:ClassBUnitsMember	whf:ClassBUnitsMember	whf:ClassBUnitsMember	whf:ClassBUnitsMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Air Freight & Logistics	Air Freight & Logistics	Air Freight & Logistics	Air Freight & Logistics	Air Freight & Logistics
Investment, Acquisition Date	Jul. 12, 2021	Jul. 12, 2021
Investment Owned, Balance, Principal Amount	$ 1,250	$ 1,250
Investment Owned, at Cost	1,250	1,250
Investment Owned, at Fair Value	$ 606	$ 1,250
Investment, Identifier [Axis]: Motivational Marketing, LLC First Lien Secured Revolving Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:MotivationalMarketingLLCMember	whf:MotivationalMarketingLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Air Freight & Logistics	Air Freight & Logistics	Air Freight & Logistics	Air Freight & Logistics	Air Freight & Logistics
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor	1%	1%	1%	1%	1%
Investment, Basis Spread, Variable Rate	6.25%	6.25%	6.25%	6.25%	6.25%
Investment Interest Rate	9.07%	7.25%	9.07%	9.07%	7.25%
Investment, Acquisition Date	Jul. 12, 2021	Jul. 12, 2021
Investment Maturity Date	Jul. 12, 2026	Jul. 12, 2026	Jul. 12, 2026	Jul. 12, 2026	Jul. 12, 2026
Investment Owned, at Fair Value	$ (22)	$ 7
Investment, Identifier [Axis]: Motivational Marketing, LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:MotivationalMarketingLLCMember	whf:MotivationalMarketingLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Air Freight & Logistics	Air Freight & Logistics	Air Freight & Logistics	Air Freight & Logistics	Air Freight & Logistics
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor	1%	1%	1%	1%	1%
Investment, Basis Spread, Variable Rate	6.25%	6.25%	6.25%	6.25%	6.25%
Investment Interest Rate	9.07%	7.25%	9.07%	9.07%	7.25%
Investment, Acquisition Date	Jul. 12, 2021	Jul. 12, 2021
Investment Maturity Date	Jul. 12, 2026	Jul. 12, 2026	Jul. 12, 2026	Jul. 12, 2026	Jul. 12, 2026
Investment Owned, Balance, Principal Amount	$ 11,124	$ 11,789
Investment Owned, at Cost	10,956	11,575
Investment Owned, at Fair Value	$ 10,744	$ 11,646
Investment, Identifier [Axis]: NMFC Senior Loan Program I LLC Units
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]		whf:ArcoleHoldingCorporationMember
Investment, Type [Extensible Enumeration]		Equity Investments			Equity Investments
Investment Owned, at Fair Value						9,269
Investment, Identifier [Axis]: NNA Services, LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:NNAServicesLLCMember	whf:NNAServicesLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Diversified Support Services	Diversified Support Services	Diversified Support Services	Diversified Support Services	Diversified Support Services
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor	1%	1%	1%	1%	1%
Investment, Basis Spread, Variable Rate	6.75%	6.75%	6.75%	6.75%	6.75%
Investment Interest Rate	10.42%	7.75%	10.42%	10.42%	7.75%
Investment, Acquisition Date	Aug. 27, 2021	Aug. 27, 2021
Investment Maturity Date	Aug. 27, 2026	Aug. 27, 2026	Aug. 27, 2026	Aug. 27, 2026	Aug. 27, 2026
Investment Owned, Balance, Principal Amount	$ 11,375	$ 11,594
Investment Owned, at Cost	11,264	11,459
Investment Owned, at Fair Value	$ 11,165	$ 11,460
Investment, Identifier [Axis]: NPAV Lessor Corp., First Lien Secured Revolving Loan, Floor 1.00%, Spread SF plus 6.00%, Rate 7.60%, Due 1/21/2027
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:NPAVLessorCorp.Member
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember		whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	us-gaap:RealEstateSectorMember		us-gaap:RealEstateSectorMember	us-gaap:RealEstateSectorMember
Investment, Interest Rate, Floor	1%		1%	1%
Investment, Basis Spread, Variable Rate	6%		6%	6%
Investment Interest Rate	9.16%		9.16%	9.16%
Investment, Acquisition Date	Mar. 01, 2022
Investment Maturity Date	Jan. 21, 2027		Jan. 21, 2027	Jan. 21, 2027
Investment Owned, at Fair Value	$ (16)
Investment, Identifier [Axis]: NPAV Lessor Corp., First Lien Secured Term Loan, Floor 1.00%, Spread SF plus 6.00%, Rate 7.60%, Due 1/21/2027
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:NPAVLessorCorp.Member
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	us-gaap:RealEstateSectorMember		us-gaap:RealEstateSectorMember	us-gaap:RealEstateSectorMember
Investment, Interest Rate, Floor	1%		1%	1%
Investment, Basis Spread, Variable Rate	6%		6%	6%
Investment Interest Rate	9.16%		9.16%	9.16%
Investment, Acquisition Date	Mar. 01, 2022
Investment Maturity Date	Jan. 21, 2027		Jan. 21, 2027	Jan. 21, 2027
Investment Owned, Balance, Principal Amount	$ 8,946
Investment Owned, at Cost	8,791
Investment Owned, at Fair Value	$ 8,588
Investment, Identifier [Axis]: Naviga Inc First Lien Secured Revolving Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:NavigaIncMember	whf:NavigaIncMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Application Software	Application Software	Application Software	Application Software	Application Software
Investment, Variable Interest Rate, Type [Extensible Enumeration]	us-gaap:BaseRateMember	London Interbank Offered Rate (LIBOR) [Member]	us-gaap:BaseRateMember	us-gaap:BaseRateMember	London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor	1%	1%	1%	1%	1%
Investment, Basis Spread, Variable Rate	6.92%	7%	6.92%	6.92%	7%
Investment Interest Rate	10.28%	8%	10.28%	10.28%	8%
Investment, Acquisition Date	Jun. 14, 2019	Jun. 14, 2019
Investment Maturity Date	Dec. 29, 2022	Dec. 29, 2022	Dec. 29, 2022	Dec. 29, 2022	Dec. 29, 2022
Investment Owned, Balance, Principal Amount	$ 267	$ 169
Investment Owned, at Cost	267	168
Investment Owned, at Fair Value	$ 261	$ 169
Investment, Identifier [Axis]: Naviga Inc First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:NavigaIncMember	whf:NavigaIncMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Application Software	Application Software	Application Software	Application Software	Application Software
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor	1%	1%	1%	1%	1%
Investment, Basis Spread, Variable Rate	7%	7%	7%	7%	7%
Investment Interest Rate	10.67%	8%	10.67%	10.67%	8%
Investment, Acquisition Date	Jun. 14, 2019	Jun. 14, 2019
Investment Maturity Date	Dec. 29, 2022	Dec. 29, 2022	Dec. 29, 2022	Dec. 29, 2022	Dec. 29, 2022
Investment Owned, Balance, Principal Amount	$ 3,189	$ 3,213
Investment Owned, at Cost	3,184	3,195
Investment Owned, at Fair Value	$ 3,125	$ 3,213
Investment, Identifier [Axis]: Nelson Worldwide, LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]		whf:NelsonWorldwideLLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Research & Consulting Services			Research & Consulting Services
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor		1%			1%
Investment, Basis Spread, Variable Rate		10.25%			10.25%
Investment Interest Rate		11.25%			11.25%
Investment, Acquisition Date		Jan. 09, 2018
Investment Maturity Date		Jan. 09, 2023			Jan. 09, 2023
Investment Owned, Balance, Principal Amount		$ 10,027
Investment Owned, at Cost		9,976
Investment Owned, at Fair Value		$ 9,826
Investment, Identifier [Axis]: PFB Holdco, Inc Class A Units
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:PFBHoldcoIncMember	whf:PFBHoldcoIncMember
Investment, Type [Extensible Enumeration]	whf:ClassAUnitsMember	whf:ClassAUnitsMember	whf:ClassAUnitsMember	whf:ClassAUnitsMember	whf:ClassAUnitsMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Building Products	Data Processing & Outsourced Services	Building Products	Building Products	Data Processing & Outsourced Services
Investment, Acquisition Date	Dec. 17, 2021	Dec. 17, 2021
Investment Owned, Balance, Principal Amount		$ 1	$ 1
Investment Owned, at Cost	$ 423	$ 423
Investment Owned, at Fair Value	$ 603				$ 427
Investment, Identifier [Axis]: PFB Holdco, Inc First Lien Secured Revolving Loan Floor 2.45
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]		whf:PFBHoldcoIncMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredRevolvingLoanMember			whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Building Products			Building Products
Investment, Variable Interest Rate, Type [Extensible Enumeration]		whf:CanadaPrimeRateMember			whf:CanadaPrimeRateMember
Investment, Interest Rate, Floor		2.45%			2.45%
Investment, Basis Spread, Variable Rate		5.50%			5.50%
Investment Interest Rate		7.95%			7.95%
Investment, Acquisition Date		Dec. 17, 2021
Investment Maturity Date		Dec. 17, 2026			Dec. 17, 2026
Investment, Identifier [Axis]: PFB Holdco, Inc First Lien Secured Revolving Loan Floor 3.25
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]		whf:PFBHoldcoIncMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredRevolvingLoanMember			whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Building Products			Building Products
Investment, Variable Interest Rate, Type [Extensible Enumeration]		us-gaap:PrimeRateMember			us-gaap:PrimeRateMember
Investment, Interest Rate, Floor		3.25%			3.25%
Investment, Basis Spread, Variable Rate		5.50%			5.50%
Investment Interest Rate		8.75%			8.75%
Investment, Acquisition Date		Dec. 17, 2021
Investment Maturity Date		Dec. 17, 2026			Dec. 17, 2026
Investment, Identifier [Axis]: PFB Holdco, Inc First Lien Secured Term Loan CDOR
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:PFBHoldcoIncMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Building Products		Building Products	Building Products
Investment, Variable Interest Rate, Type [Extensible Enumeration]	CanadianDollarOfferedRateMember		CanadianDollarOfferedRateMember	CanadianDollarOfferedRateMember
Investment, Interest Rate, Floor	1%		1%	1%
Investment, Basis Spread, Variable Rate	6%		6%	6%
Investment Interest Rate	8.71%		8.71%	8.71%
Investment, Acquisition Date	Dec. 17, 2021
Investment Maturity Date	Dec. 17, 2026		Dec. 17, 2026	Dec. 17, 2026
Investment Owned, Balance, Principal Amount			$ 8,959
Investment Owned, at Cost	$ 6,889
Investment Owned, at Fair Value	$ 6,382
Investment, Identifier [Axis]: PFB Holdco, Inc First Lien Secured Term Loan Floor 2.45
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]		whf:PFBHoldcoIncMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Building Products			Building Products
Investment, Variable Interest Rate, Type [Extensible Enumeration]		whf:CanadaPrimeRateMember			whf:CanadaPrimeRateMember
Investment, Interest Rate, Floor		2.45%			2.45%
Investment, Basis Spread, Variable Rate		5.50%			5.50%
Investment Interest Rate		7.95%			7.95%
Investment, Acquisition Date		Dec. 17, 2021
Investment Maturity Date		Dec. 17, 2026			Dec. 17, 2026
Investment Owned, Balance, Principal Amount		$ 9,027
Investment Owned, at Cost		6,923
Investment Owned, at Fair Value		$ 6,998
Investment, Identifier [Axis]: PFB Holdco, Inc First Lien Secured Term Loan Floor 3.25
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]		whf:PFBHoldcoIncMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Building Products			Building Products
Investment, Variable Interest Rate, Type [Extensible Enumeration]		us-gaap:PrimeRateMember			us-gaap:PrimeRateMember
Investment, Interest Rate, Floor		3.25%			3.25%
Investment, Basis Spread, Variable Rate		5.50%			5.50%
Investment Interest Rate		8.75%			8.75%
Investment, Acquisition Date		Dec. 17, 2021
Investment Maturity Date		Dec. 17, 2026			Dec. 17, 2026
Investment Owned, Balance, Principal Amount		$ 2,198
Investment Owned, at Cost		2,154
Investment Owned, at Fair Value		$ 2,154
Investment, Identifier [Axis]: PFB Holdco, Inc. First Lien Secured Revolving Loan CDOR
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:PFBHoldcoIncMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember		whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Building Products		Building Products	Building Products
Investment, Variable Interest Rate, Type [Extensible Enumeration]	CanadianDollarOfferedRateMember		CanadianDollarOfferedRateMember	CanadianDollarOfferedRateMember
Investment, Interest Rate, Floor	1%		1%	1%
Investment, Basis Spread, Variable Rate	6%		6%	6%
Investment Interest Rate	8.71%		8.71%	8.71%
Investment, Acquisition Date	Dec. 17, 2021
Investment Maturity Date	Dec. 17, 2026		Dec. 17, 2026	Dec. 17, 2026
Investment Owned, at Fair Value	$ 2
Investment, Identifier [Axis]: PFB Holdco, Inc. First Lien Secured Revolving Loan LIBOR
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:PFBHoldcoIncMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember		whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Building Products		Building Products	Building Products
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]		London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor	1%		1%	1%
Investment, Basis Spread, Variable Rate	6%		6%	6%
Investment Interest Rate	8.28%		8.28%	8.28%
Investment, Acquisition Date	Dec. 17, 2021
Investment Maturity Date	Dec. 17, 2026		Dec. 17, 2026	Dec. 17, 2026
Investment Owned, at Fair Value	$ 1
Investment, Identifier [Axis]: PFB Holdco, Inc. First Lien Secured Term Loan LIBOR
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:PFBHoldcoIncMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Building Products		Building Products	Building Products
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]		London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor	1%		1%	1%
Investment, Basis Spread, Variable Rate	6%		6%	6%
Investment Interest Rate	8.28%		8.28%	8.28%
Investment, Acquisition Date	Dec. 17, 2021
Investment Maturity Date	Dec. 17, 2026		Dec. 17, 2026	Dec. 17, 2026
Investment Owned, Balance, Principal Amount	$ 2,182
Investment Owned, at Cost	2,144
Investment Owned, at Fair Value	$ 2,154
Investment, Identifier [Axis]: PG Dental New Jersey Parent, LLC First Lien Secured Revolving Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:PGDentalNewJerseyParentLLCMember	whf:PGDentalNewJerseyParentLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Health Care Services [Member]	Health Care Services [Member]	Health Care Services [Member]	Health Care Services [Member]	Health Care Services [Member]
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor	1%	1%	1%	1%	1%
Investment, Basis Spread, Variable Rate	9.75%	9.25%	9.75%	9.75%	9.25%
Investment Interest Rate	12.57%	10.25%	12.57%	12.57%	10.25%
Investment, Acquisition Date	Nov. 25, 2020	Nov. 25, 2020
Investment Maturity Date	Nov. 25, 2025	Nov. 25, 2025	Nov. 25, 2025	Nov. 25, 2025	Nov. 25, 2025
Investment Owned, Balance, Principal Amount	$ 352	$ 702
Investment Owned, at Cost	347	689
Investment Owned, at Fair Value	$ 308	$ 631
Investment, Interest Rate, Paid in Kind	1.50%	1.50%	1.50%	1.50%	1.50%
Investment, Interest Rate, Paid in Cash	11.07%	8.75%	11.07%	11.07%	8.75%
Investment, Identifier [Axis]: PG Dental New Jersey Parent, LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:PGDentalNewJerseyParentLLCMember	whf:PGDentalNewJerseyParentLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Health Care Services [Member]	Health Care Services [Member]	Health Care Services [Member]	Health Care Services [Member]	Health Care Services [Member]
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor	1%	1%	1%	1%	1%
Investment, Basis Spread, Variable Rate	9.75%	9.25%	9.75%	9.75%	9.25%
Investment Interest Rate	12.57%	10.25%	12.57%	12.57%	10.25%
Investment, Acquisition Date	Nov. 25, 2020	Nov. 25, 2020
Investment Maturity Date	Nov. 25, 2025	Nov. 25, 2025	Nov. 25, 2025	Nov. 25, 2025	Nov. 25, 2025
Investment Owned, Balance, Principal Amount	$ 14,845	$ 15,448
Investment Owned, at Cost	14,640	15,178
Investment Owned, at Fair Value	$ 13,807	$ 14,212
Investment, Interest Rate, Paid in Kind	1.50%	1.50%	1.50%	1.50%	1.50%
Investment, Interest Rate, Paid in Cash	11.07%	8.75%	11.07%	11.07%	8.75%
Investment, Identifier [Axis]: PPS CR Acquisition, Inc First Lien Secured Delayed Draw Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:PPSCRAcquisitionIncMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredDelayedDrawLoanMember		whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Heavy Electrical Equipment [Member]		Heavy Electrical Equipment [Member]	Heavy Electrical Equipment [Member]
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]		London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor	1%		1%	1%
Investment, Basis Spread, Variable Rate	6.25%		6.25%	6.25%
Investment Interest Rate	9.92%		9.92%	9.92%
Investment, Acquisition Date	Jul. 11, 2022
Investment Maturity Date	Jun. 25, 2026		Jun. 25, 2026	Jun. 25, 2026
Investment Owned, at Fair Value	$ (1)
Investment, Identifier [Axis]: PPS CR Acquisition, Inc First Lien Secured Revolving Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:PPSCRAcquisitionIncMember	whf:PPSCRAcquisitionIncMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Heavy Electrical Equipment [Member]	Heavy Electrical Equipment [Member]	Heavy Electrical Equipment [Member]	Heavy Electrical Equipment [Member]	Heavy Electrical Equipment [Member]
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor	1%	1%	1%	1%	1%
Investment, Basis Spread, Variable Rate	6.25%	6.25%	6.25%	6.25%	6.25%
Investment Interest Rate	9.92%	7.25%	9.92%	9.92%	7.25%
Investment, Acquisition Date	Jun. 25, 2021	Jun. 25, 2021
Investment Maturity Date	Jun. 25, 2024	Jun. 25, 2024	Jun. 25, 2024	Jun. 25, 2024	Jun. 25, 2024
Investment Owned, Balance, Principal Amount	$ 104	$ 104
Investment Owned, at Cost	103	103
Investment Owned, at Fair Value	$ 63	$ 113
Investment, Identifier [Axis]: PPS CR Acquisition, Inc First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:PPSCRAcquisitionIncMember	whf:PPSCRAcquisitionIncMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Heavy Electrical Equipment [Member]	Heavy Electrical Equipment [Member]	Heavy Electrical Equipment [Member]	Heavy Electrical Equipment [Member]	Heavy Electrical Equipment [Member]
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor	1%	1%	1%	1%	1%
Investment, Basis Spread, Variable Rate	6.25%	6.25%	6.25%	6.25%	6.25%
Investment Interest Rate	9.92%	7.25%	9.92%	9.92%	7.25%
Investment, Acquisition Date	Jun. 25, 2021	Jun. 25, 2021
Investment Maturity Date	Jun. 25, 2026	Jun. 25, 2026	Jun. 25, 2026	Jun. 25, 2026	Jun. 25, 2026
Investment Owned, Balance, Principal Amount	$ 14,166	$ 11,123
Investment Owned, at Cost	13,942	10,924
Investment Owned, at Fair Value	$ 13,835	$ 10,975
Investment, Identifier [Axis]: PS Lightwave, Inc., First Lien Secured Delayed Draw Loan, Floor 1.50%, Spread L plus 6.75%, Rate 8.25%, Due 3/10/2025
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]		whf:PSLightwaveInc.Member
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredDelayedDrawLoanMember			whf:FirstLienSecuredDelayedDrawLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Technology Hardware, Storage & Peripherals			Technology Hardware, Storage & Peripherals
Investment, Interest Rate, Floor		1.50%			1.50%
Investment, Basis Spread, Variable Rate		6.75%			6.75%
Investment Interest Rate		8.25%			8.25%
Investment, Acquisition Date		May 19, 2020
Investment Maturity Date		Mar. 10, 2025			Mar. 10, 2025
Investment Owned, at Fair Value		$ 5
Investment, Identifier [Axis]: PS Lightwave, Inc., First Lien Secured Term Loan, Floor 1.50%, Spread L plus 6.75%, Rate 8.25%, Due 3/10/2025
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]		whf:PSLightwaveInc.Member
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Technology Hardware, Storage & Peripherals			Technology Hardware, Storage & Peripherals
Investment, Interest Rate, Floor		1.50%			1.50%
Investment, Basis Spread, Variable Rate		6.75%			6.75%
Investment Interest Rate		8.25%			8.25%
Investment, Acquisition Date		May 19, 2020
Investment Maturity Date		Mar. 10, 2025			Mar. 10, 2025
Investment Owned, Balance, Principal Amount		$ 7,304
Investment Owned, at Cost		7,207
Investment Owned, at Fair Value		$ 7,230
Investment, Identifier [Axis]: Patagonia Hold co Llc First Lien Secured Term Loans
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:PatagoniaHoldcoLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Alternative Carriers		Alternative Carriers	Alternative Carriers
Investment, Variable Interest Rate, Type [Extensible Enumeration]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]		Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
Investment, Interest Rate, Floor	0.50%		0.50%	0.50%
Investment, Basis Spread, Variable Rate	5.75%		5.75%	5.75%
Investment Interest Rate	8.39%		8.39%	8.39%
Investment, Acquisition Date	Aug. 05, 2022
Investment Maturity Date	Aug. 01, 2029		Aug. 01, 2029	Aug. 01, 2029
Investment Owned, Balance, Principal Amount	$ 14,625
Investment Owned, at Cost	12,040
Investment Owned, at Fair Value	$ 11,993
Investment, Identifier [Axis]: Pennsylvania Machine Works, LLC, First Lien Secured Term Loan, Floor 1.00%, Spread SF plus 6.25%, Rate 8.57%, Due 3/8/27
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:PennsylvaniaMachineWorksLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Industrial Machinery		Industrial Machinery	Industrial Machinery
Investment, Interest Rate, Floor	1%		1%	1%
Investment, Basis Spread, Variable Rate	6.25%		6.25%	6.25%
Investment Interest Rate	10.06%		10.06%	10.06%
Investment, Acquisition Date	Mar. 25, 2022
Investment Maturity Date	Mar. 08, 2027		Mar. 08, 2027	Mar. 08, 2027
Investment Owned, Balance, Principal Amount	$ 6,925
Investment Owned, at Cost	6,833
Investment Owned, at Fair Value	$ 6,925
Investment, Identifier [Axis]: PlayMonster LLC First Lien Secured Delayed Draw Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]		PlayMonster LLC [Member].
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredDelayedDrawLoanMember			whf:FirstLienSecuredDelayedDrawLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Leisure Products			Leisure Products
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor		1%			1%
Investment, Basis Spread, Variable Rate		6%			6%
Investment Interest Rate		7%			7%
Investment, Acquisition Date		Jun. 07, 2021
Investment Maturity Date		Jun. 07, 2026			Jun. 07, 2026
Investment Owned, Balance, Principal Amount		$ 224
Investment Owned, at Cost		221
Investment Owned, at Fair Value		$ (828)
Investment, Identifier [Axis]: PlayMonster LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	PlayMonster LLC [Member].	PlayMonster LLC [Member].
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Leisure Products			Leisure Products
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor		1%			1%
Investment, Basis Spread, Variable Rate		6%			6%
Investment Interest Rate		7%			7%
Investment, Acquisition Date		Jun. 07, 2021
Investment Maturity Date		Jun. 07, 2026			Jun. 07, 2026
Investment Owned, Balance, Principal Amount		$ 6,000
Investment Owned, at Cost		5,894
Investment Owned, at Fair Value		$ 3,900
Investment, Identifier [Axis]: Playmonster Group Equity Inc Common Equity
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:PlaymonsterGroupLLCMember
Investment, Type [Extensible Enumeration]	Common Stock [Member]		Common Stock [Member]	Common Stock [Member]
Investment, Identifier [Axis]: Playmonster Group Equity Inc Preferred Equity
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:PlaymonsterGroupLLCMember
Investment, Type [Extensible Enumeration]	us-gaap:PreferredStockMember		us-gaap:PreferredStockMember	us-gaap:PreferredStockMember
Investment Owned, at Fair Value	$ 2,099
Investment, Identifier [Axis]: Playmonster Group Equity, Inc Common Stock
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:PlaymonsterGroupEquityIncMember
Investment, Type [Extensible Enumeration]	Common Stock [Member]		Common Stock [Member]	Common Stock [Member]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Leisure Products		Leisure Products	Leisure Products
Investment, Acquisition Date	Jan. 24, 2022
Investment Owned, Balance, Principal Amount	$ 72
Investment Owned, at Cost	$ 460
Investment, Identifier [Axis]: Playmonster Group Equity, Inc. Preferred Stock
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:PlaymonsterGroupEquityIncMember
Investment, Type [Extensible Enumeration]	us-gaap:PreferredStockMember		us-gaap:PreferredStockMember	us-gaap:PreferredStockMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Leisure Products		Leisure Products	Leisure Products
Investment, Basis Spread, Variable Rate	14%		14%	14%
Investment, Acquisition Date	Jan. 24, 2022
Investment Owned, Balance, Principal Amount	$ 36
Investment Owned, at Cost	3,600
Investment Owned, at Fair Value	$ 2,099
Investment, Interest Rate, Paid in Kind	14%		14%	14%
Investment, Identifier [Axis]: Playmonster Group LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:PlaymonsterGroupLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Leisure Products		Leisure Products	Leisure Products
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]		London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor	1%		1%	1%
Investment, Basis Spread, Variable Rate	8%		8%	8%
Investment Interest Rate	10.78%		10.78%	10.78%
Investment, Acquisition Date	Jan. 24, 2022
Investment Maturity Date	Jun. 08, 2026		Jun. 08, 2026	Jun. 08, 2026
Investment Owned, Balance, Principal Amount	$ 3,565
Investment Owned, at Cost	3,565
Investment Owned, at Fair Value	$ 3,509
Investment, Interest Rate, Paid in Kind	8%		8%	8%
Investment, Interest Rate, Paid in Cash	2.78%		2.78%	2.78%
Investment, Identifier [Axis]: Potpourri Group, Inc First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:PotpourriGroupIncMember	whf:PotpourriGroupIncMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Internet & Direct Marketing Retail	Internet & Direct Marketing Retail	Internet & Direct Marketing Retail	Internet & Direct Marketing Retail	Internet & Direct Marketing Retail
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor	1.50%	1.50%	1.50%	1.50%	1.50%
Investment, Basis Spread, Variable Rate	8.25%	8.25%	8.25%	8.25%	8.25%
Investment Interest Rate	9.75%	9.75%	9.75%	9.75%	9.75%
Investment, Acquisition Date	Jul. 03, 2019	Jul. 03, 2019
Investment Maturity Date	Jul. 03, 2024	Jul. 03, 2024	Jul. 03, 2024	Jul. 03, 2024	Jul. 03, 2024
Investment Owned, Balance, Principal Amount	$ 16,513	$ 17,148
Investment Owned, at Cost	16,383	16,955
Investment Owned, at Fair Value	$ 16,513	$ 17,148
Investment, Identifier [Axis]: Poultry Holdings LLC (HPP), First Lien Secured Term Loan, Floor 1.00%, Spread L plus 7.25%, Rate 8.25% (6.75% Cash + 1.50% PIK), Due 6/28/225
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:PoultryHoldingsLLCMember	whf:PoultryHoldingsLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Packaged Foods & Meats	Packaged Foods & Meats	Packaged Foods & Meats	Packaged Foods & Meats	Packaged Foods & Meats
Investment, Interest Rate, Floor	1%	1%	1%	1%	1%
Investment, Basis Spread, Variable Rate	7.25%	7.25%	7.25%	7.25%	7.25%
Investment Interest Rate	10.38%	8.25%	10.38%	10.38%	8.25%
Investment, Acquisition Date	Oct. 21, 2019	Oct. 21, 2019
Investment Maturity Date	Jun. 28, 2025	Jun. 28, 2025	Jun. 28, 2025	Jun. 28, 2025	Jun. 28, 2025
Investment Owned, Balance, Principal Amount	$ 7,183	$ 7,770
Investment Owned, at Cost	7,117	7,676
Investment Owned, at Fair Value	$ 6,914	$ 6,993
Investment, Interest Rate, Paid in Kind	1.50%	1.50%	1.50%	1.50%	1.50%
Investment, Interest Rate, Paid in Cash	8.88%	6.75%	8.88%	8.88%	6.75%
Investment, Identifier [Axis]: Project Castle, Inc First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:ProjectCastleIncMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Industrial Machinery		Industrial Machinery	Industrial Machinery
Investment, Variable Interest Rate, Type [Extensible Enumeration]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]		Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
Investment, Interest Rate, Floor	0.50%		0.50%	0.50%
Investment, Basis Spread, Variable Rate	5.50%		5.50%	5.50%
Investment Interest Rate	9.05%		9.05%	9.05%
Investment, Acquisition Date	Jun. 09, 2022
Investment Maturity Date	Jun. 01, 2029		Jun. 01, 2029	Jun. 01, 2029
Investment Owned, Balance, Principal Amount	$ 8,376
Investment Owned, at Cost	7,521
Investment Owned, at Fair Value	$ 7,541
Investment, Identifier [Axis]: Quest Events, LLC Preferred Units
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:QuestEventsLLCMember	whf:QuestEventsLLCMember
Investment, Type [Extensible Enumeration]	whf:PreferredUnitsMember	whf:PreferredUnitsMember	whf:PreferredUnitsMember	whf:PreferredUnitsMember	whf:PreferredUnitsMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Diversified Support Services	Diversified Support Services	Diversified Support Services	Diversified Support Services	Diversified Support Services
Investment, Acquisition Date	Dec. 28, 2018	Dec. 28, 2018
Investment Maturity Date	Dec. 08, 2025	Dec. 08, 2025	Dec. 08, 2025	Dec. 08, 2025	Dec. 08, 2025
Investment Owned, Balance, Principal Amount	$ 331	$ 317
Investment Owned, at Cost	331	$ 317
Investment Owned, at Fair Value	$ 60
Investment, Identifier [Axis]: Quest Events, LLC, First Lien Secured Revolving Loan, Floor 1.00%, Spread L plus 6.00%, Rate 7.00%, Due 12/28/2024
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:QuestEventsLLCMember	whf:QuestEventsLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Diversified Support Services	Diversified Support Services	Diversified Support Services	Diversified Support Services	Diversified Support Services
Investment, Interest Rate, Floor	1%	1%	1%	1%	1%
Investment, Basis Spread, Variable Rate	6%	6%	6%	6%	6%
Investment Interest Rate	9.67%	7%	9.67%	9.67%	7%
Investment, Acquisition Date	Jul. 19, 2019	Jul. 19, 2019
Investment Maturity Date	Dec. 28, 2024	Dec. 28, 2024	Dec. 28, 2024	Dec. 28, 2024	Dec. 28, 2024
Investment Owned, Balance, Principal Amount	$ 468	$ 935
Investment Owned, at Cost	464	925
Investment Owned, at Fair Value	$ 424	$ 760
Investment, Identifier [Axis]: Quest Events, LLC, First Lien Secured Term Loan, Floor 1.00%, Spread L plus 6.00%, Rate 7.00%, Due 12/28/2024
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:QuestEventsLLCMember	whf:QuestEventsLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Diversified Support Services	Diversified Support Services	Diversified Support Services	Diversified Support Services	Diversified Support Services
Investment, Interest Rate, Floor	1%	1%	1%	1%	1%
Investment, Basis Spread, Variable Rate	6%	6%	6%	6%	6%
Investment Interest Rate	9.67%	7%	9.67%	9.67%	7%
Investment, Acquisition Date	Jul. 19, 2019	Jul. 19, 2019
Investment Maturity Date	Dec. 28, 2024	Dec. 28, 2024	Dec. 28, 2024	Dec. 28, 2024	Dec. 28, 2024
Investment Owned, Balance, Principal Amount	$ 11,926	$ 11,966
Investment Owned, at Cost	11,838	11,848
Investment Owned, at Fair Value	$ 11,317	$ 9,729
Investment, Identifier [Axis]: RCKC Acquisitions LLC , First Lien Secured Delayed Draw Loan, Floor 1.00%, Spread L plus 6.25%, Rate 7.25%, Due 12/31/2026
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:RCKCAcquisitionsLLCMember	whf:RCKCAcquisitionsLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	IT Consulting And Other Services	IT Consulting And Other Services	IT Consulting And Other Services	IT Consulting And Other Services	IT Consulting And Other Services
Investment, Interest Rate, Floor	1%	1%	1%	1%	1%
Investment, Basis Spread, Variable Rate	6.25%	6.25%	6.25%	6.25%	6.25%
Investment Interest Rate	9.04%	7.25%	9.04%	9.04%	7.25%
Investment, Acquisition Date	Jan. 27, 2021	Jan. 27, 2021
Investment Maturity Date	Dec. 31, 2026	Dec. 31, 2026	Dec. 31, 2026	Dec. 31, 2026	Dec. 31, 2026
Investment Owned, Balance, Principal Amount	$ 3,014
Investment Owned, at Cost	2,967
Investment Owned, at Fair Value	$ 2,969	$ (5)
Investment, Identifier [Axis]: RCKC Acquisitions LLC , First Lien Secured Revolving Loan, Floor 1.00%, Spread L plus 6.25%, Rate 7.25%, Due 12/31/2026
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:RCKCAcquisitionsLLCMember	whf:RCKCAcquisitionsLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	IT Consulting And Other Services	IT Consulting And Other Services	IT Consulting And Other Services	IT Consulting And Other Services	IT Consulting And Other Services
Investment, Interest Rate, Floor	1%	1%	1%	1%	1%
Investment, Basis Spread, Variable Rate	6.25%	6.25%	6.25%	6.25%	6.25%
Investment Interest Rate	9.20%	7.25%	9.20%	9.20%	7.25%
Investment, Acquisition Date	Jan. 27, 2021	Jan. 27, 2021
Investment Maturity Date	Dec. 31, 2026	Dec. 31, 2026	Dec. 31, 2026	Dec. 31, 2026	Dec. 31, 2026
Investment Owned, Balance, Principal Amount	$ 533	$ 818
Investment Owned, at Cost	526	804
Investment Owned, at Fair Value	$ 525	$ 814
Investment, Identifier [Axis]: RCKC Acquisitions LLC , First Lien Secured Term Loan, Floor 1.00%, Spread L plus 6.25%, Rate 7.25%, Due 12/312026
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:RCKCAcquisitionsLLCMember	whf:RCKCAcquisitionsLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	IT Consulting And Other Services	IT Consulting And Other Services	IT Consulting And Other Services	IT Consulting And Other Services	IT Consulting And Other Services
Investment, Interest Rate, Floor	1%	1%	1%	1%	1%
Investment, Basis Spread, Variable Rate	6.25%	6.25%	6.25%	6.25%	6.25%
Investment Interest Rate	9.92%	7.25%	9.92%	9.92%	7.25%
Investment, Acquisition Date	Jan. 27, 2021	Jan. 27, 2021
Investment Maturity Date	Dec. 31, 2026	Dec. 31, 2026	Dec. 31, 2026	Dec. 31, 2026	Dec. 31, 2026
Investment Owned, Balance, Principal Amount	$ 11,179	$ 11,264
Investment Owned, at Cost	11,018	11,074
Investment Owned, at Fair Value	$ 11,011	$ 11,151
Investment, Identifier [Axis]: RLJ Pro-Vac, Inc. First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]		whf:RLJPro-VacInc.Member
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Environmental & Facilities Services			Environmental & Facilities Services
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor		1%			1%
Investment, Basis Spread, Variable Rate		6.25%			6.25%
Investment Interest Rate		7.25%			7.25%
Investment, Acquisition Date		Dec. 31, 2021
Investment Maturity Date		Dec. 31, 2026			Dec. 31, 2026
Investment Owned, Balance, Principal Amount		$ 8,775
Investment Owned, at Cost		8,600
Investment Owned, at Fair Value		$ 8,600
Investment, Identifier [Axis]: RLJ Pro-Vac, Inc. First Lien Secured Term Loan First Lien Secured Revolving Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]		whf:RLJPro-VacInc.Member
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredRevolvingLoanMember			whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Environmental & Facilities Services			Environmental & Facilities Services
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor		1%			1%
Investment, Basis Spread, Variable Rate		6.25%			6.25%
Investment Interest Rate		7.25%			7.25%
Investment, Acquisition Date		Dec. 31, 2021
Investment Maturity Date		Dec. 31, 2026			Dec. 31, 2026
Investment, Identifier [Axis]: Road Safety Services, First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]		whf:RoadSafetyServicesIncMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Construction & Engineering			Construction & Engineering
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor		1%			1%
Investment, Basis Spread, Variable Rate		6.50%			6.50%
Investment Interest Rate		7.50%			7.50%
Investment, Acquisition Date		Dec. 30, 2021
Investment Maturity Date		Mar. 18, 2025			Mar. 18, 2025
Investment Owned, Balance, Principal Amount		$ 4,099
Investment Owned, at Cost		4,017
Investment Owned, at Fair Value		$ 4,017
Investment, Identifier [Axis]: Road Safety Services, Inc., First Lien Secured Revolving Loan, Floor 3.25%, Spread P plus 5.50%, Rate 8.75%, Due 9/18/2023
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]		whf:RoadSafetyServicesIncMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredRevolvingLoanMember			whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Construction & Engineering			Construction & Engineering
Investment, Interest Rate, Floor		3.25%			3.25%
Investment, Basis Spread, Variable Rate		5.50%			5.50%
Investment Interest Rate		8.75%			8.75%
Investment, Acquisition Date		Dec. 31, 2019
Investment Maturity Date		Sep. 18, 2023			Sep. 18, 2023
Investment Owned, Balance, Principal Amount		$ 496
Investment Owned, at Cost		489
Investment Owned, at Fair Value		$ 501
Investment, Identifier [Axis]: Road Safety Services, Inc., First Lien Secured Term Loan, Floor 1.00%, Spread L plus 6.50%, Rate 7.50%, Due 3/18/2025
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:RoadSafetyServicesIncMember	whf:RoadSafetyServicesIncMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Construction & Engineering	Construction & Engineering	Construction & Engineering	Construction & Engineering	Construction & Engineering
Investment, Interest Rate, Floor	1%	1%	1%	1%	1%
Investment, Basis Spread, Variable Rate	6.50%	6.50%	6.50%	6.50%	6.50%
Investment Interest Rate	9.63%	7.50%	9.63%	9.63%	7.50%
Investment, Acquisition Date	Dec. 31, 2019	Dec. 31, 2019
Investment Maturity Date	Mar. 18, 2025	Mar. 18, 2025	Mar. 18, 2025	Mar. 18, 2025	Mar. 18, 2025
Investment Owned, Balance, Principal Amount	$ 8,625	$ 6,427
Investment Owned, at Cost	8,534	6,340
Investment Owned, at Fair Value	$ 8,625	$ 6,405
Investment, Identifier [Axis]: Ross-Simons Topco, LP Preferred Units
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:Ross-SimonsTopcoLPMember	whf:Ross-SimonsTopcoLPMember
Investment, Type [Extensible Enumeration]	whf:PreferredUnitsMember	whf:PreferredUnitsMember	whf:PreferredUnitsMember	whf:PreferredUnitsMember	whf:PreferredUnitsMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Internet & Direct Marketing Retail	Internet & Direct Marketing Retail	Internet & Direct Marketing Retail	Internet & Direct Marketing Retail	Internet & Direct Marketing Retail
Investment, Basis Spread, Variable Rate	8%	8%	8%	8%	8%
Investment, Acquisition Date	Dec. 04, 2020	Dec. 04, 2020
Investment Owned, Balance, Principal Amount	$ 600	$ 600
Investment Owned, at Cost	514	600
Investment Owned, at Fair Value	$ 816	$ 786
Investment, Interest Rate, Paid in Kind	8%	8%	8%	8%	8%
Investment, Identifier [Axis]: SFS Global Holding Company Warrants
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:SFSGlobalHoldingCompanyMember	whf:SFSGlobalHoldingCompanyMember
Investment, Type [Extensible Enumeration]	Warrant [Member]	Warrant [Member]	Warrant [Member]	Warrant [Member]	Warrant [Member]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Other Diversified Financial Services [Member]	Other Diversified Financial Services [Member]	Other Diversified Financial Services [Member]	Other Diversified Financial Services [Member]	Other Diversified Financial Services [Member]
Investment, Acquisition Date	Jun. 28, 2018	Jun. 28, 2018
Investment Maturity Date	Dec. 28, 2025	Dec. 28, 2025	Dec. 28, 2025	Dec. 28, 2025	Dec. 28, 2025
Investment, Identifier [Axis]: Sigue Corporation Warrants
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:SigueCorporationMember	whf:SigueCorporationMember
Investment, Type [Extensible Enumeration]	Warrant [Member]	Warrant [Member]	Warrant [Member]	Warrant [Member]	Warrant [Member]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Other Diversified Financial Services [Member]	Other Diversified Financial Services [Member]	Other Diversified Financial Services [Member]	Other Diversified Financial Services [Member]	Other Diversified Financial Services [Member]
Investment, Acquisition Date	Jun. 28, 2018	Jun. 28, 2018
Investment Maturity Date	Dec. 28, 2025	Dec. 28, 2025	Dec. 28, 2025	Dec. 28, 2025	Dec. 28, 2025
Investment Owned, Balance, Principal Amount	$ 22	$ 22
Investment Owned, at Cost	2,890	2,890
Investment Owned, at Fair Value	$ 3,823	$ 3,492
Investment, Identifier [Axis]: Sklar Holdings, Inc First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:SklarHoldingsIncMember	whf:SklarHoldingsIncMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Diversified Chemicals [Member]	Diversified Chemicals [Member]	Diversified Chemicals [Member]	Diversified Chemicals [Member]	Diversified Chemicals [Member]
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor	1%	1%	1%	1%	1%
Investment, Basis Spread, Variable Rate	9.75%	7.75%	9.75%	9.75%	7.75%
Investment Interest Rate	10.75%	8.75%	10.75%	10.75%	8.75%
Investment, Acquisition Date	Nov. 13, 2019	Nov. 13, 2019
Investment Maturity Date	May 13, 2023	May 13, 2023	May 13, 2023	May 13, 2023	May 13, 2023
Investment Owned, Balance, Principal Amount	$ 7,353	$ 7,389
Investment Owned, at Cost	7,292	7,295
Investment Owned, at Fair Value	$ 6,695	$ 7,020
Investment, Interest Rate, Paid in Kind	2%		2%	2%
Investment, Interest Rate, Paid in Cash	8.75%		8.75%	8.75%
Investment, Identifier [Axis]: Sleep OpCo LLC First Lien Secured Revolving Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:SleepOpCoLLCMember	whf:SleepOpCoLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Home Furnishings [Member]	Home Furnishings [Member]	Home Furnishings [Member]	Home Furnishings [Member]	Home Furnishings [Member]
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor	1%	1%	1%	1%	1%
Investment, Basis Spread, Variable Rate	6.50%	6.50%	6.50%	6.50%	6.50%
Investment Interest Rate	8.92%	7.50%	8.92%	8.92%	7.50%
Investment, Acquisition Date	Oct. 12, 2021	Oct. 12, 2021
Investment Maturity Date	Oct. 12, 2026	Oct. 12, 2026	Oct. 12, 2026	Oct. 12, 2026	Oct. 12, 2026
Investment Owned, at Fair Value	$ 10
Investment, Identifier [Axis]: Sleep OpCo LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:SleepOpCoLLCMember	whf:SleepOpCoLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Home Furnishings [Member]	Home Furnishings [Member]	Home Furnishings [Member]	Home Furnishings [Member]	Home Furnishings [Member]
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor	1%	1%	1%	1%	1%
Investment, Basis Spread, Variable Rate	6.50%	6.50%	6.50%	6.50%	6.50%
Investment Interest Rate	8.92%	7.50%	8.92%	8.92%	7.50%
Investment, Acquisition Date	Oct. 12, 2021	Oct. 12, 2021
Investment Maturity Date	Oct. 12, 2026	Oct. 12, 2026	Oct. 12, 2026	Oct. 12, 2026	Oct. 12, 2026
Investment Owned, Balance, Principal Amount	$ 20,895	$ 20,034
Investment Owned, at Cost	20,555	19,651
Investment Owned, at Fair Value	$ 20,630	$ 19,645
Investment, Identifier [Axis]: Smalto Inc., First Lien Secured Revolving Loan, Floor 1.00%, Spread E plus 6.00%, Rate 7.25%, Due 4/29/27
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:SmaltoInc.Member
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember		whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Household Appliances		Household Appliances	Household Appliances
Investment, Interest Rate, Floor	1%		1%	1%
Investment, Basis Spread, Variable Rate	6.25%		6.25%	6.25%
Investment Interest Rate	7.25%		7.25%	7.25%
Investment, Acquisition Date	May 04, 2022
Investment Maturity Date	Apr. 29, 2027		Apr. 29, 2027	Apr. 29, 2027
Investment Owned, Balance, Principal Amount	$ 419
Investment Owned, at Cost	437
Investment Owned, at Fair Value	$ 396
Investment, Identifier [Axis]: Smalto Inc., First Lien Secured Revolving Loan, Floor 1.00%, Spread SF plus 6.00%, Rate 7.25%, Due 4/29/27
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:SmaltoInc.Member
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember		whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Household Appliances		Household Appliances	Household Appliances
Investment, Interest Rate, Floor	1%		1%	1%
Investment, Basis Spread, Variable Rate	6%		6%	6%
Investment Interest Rate	8.68%		8.68%	8.68%
Investment, Acquisition Date	May 04, 2022
Investment Maturity Date	Apr. 29, 2027		Apr. 29, 2027	Apr. 29, 2027
Investment Owned, Balance, Principal Amount	$ 17
Investment Owned, at Cost	17
Investment Owned, at Fair Value	$ 17
Investment, Identifier [Axis]: Smalto Inc., First Lien Secured Term Loan, Floor 1.00%, Spread E plus 6.25%, Rate 7.25%, Due 4/28/28
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:SmaltoInc.Member
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Household Appliances		Household Appliances	Household Appliances
Investment, Interest Rate, Floor	1%		1%	1%
Investment, Basis Spread, Variable Rate	6.25%		6.25%	6.25%
Investment Interest Rate	7.25%		7.25%	7.25%
Investment, Acquisition Date	May 04, 2022
Investment Maturity Date	Apr. 28, 2028		Apr. 28, 2028	Apr. 28, 2028
Investment Owned, Balance, Principal Amount	$ 6,659
Investment Owned, at Cost	6,876
Investment Owned, at Fair Value	$ 6,364
Investment, Identifier [Axis]: Smalto Inc., First Lien Secured Term Loan, Floor 1.00%, Spread SF plus 6.00%, Rate 7.18%, Due 4/28/28
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:SmaltoInc.Member
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Household Appliances		Household Appliances	Household Appliances
Investment, Interest Rate, Floor	1%		1%	1%
Investment, Basis Spread, Variable Rate	6%		6%	6%
Investment Interest Rate	9.19%		9.19%	9.19%
Investment, Acquisition Date	May 04, 2022
Investment Maturity Date	Apr. 28, 2028		Apr. 28, 2028	Apr. 28, 2028
Investment Owned, Balance, Principal Amount	$ 1,014
Investment Owned, at Cost	995
Investment Owned, at Fair Value	$ 996
Investment, Identifier [Axis]: Snap Fitness Holdings, Inc Class A Common Stock
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:SnapFitnessHoldingsIncMember	whf:SnapFitnessHoldingsIncMember
Investment, Type [Extensible Enumeration]	us-gaap:CommonClassAMember	us-gaap:CommonClassAMember	us-gaap:CommonClassAMember	us-gaap:CommonClassAMember	us-gaap:CommonClassAMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Leisure Facilities [Member]	Leisure Facilities [Member]	Leisure Facilities [Member]	Leisure Facilities [Member]	Leisure Facilities [Member]
Investment, Acquisition Date	Jun. 29, 2020	Jun. 29, 2020
Investment Owned, Balance, Principal Amount	$ 2	$ 2
Investment Owned, at Cost	1,941	1,941
Investment Owned, at Fair Value	$ 157	$ 188
Investment, Identifier [Axis]: Snap Fitness Holdings, Inc First Lien Secured Term Loan C
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:SnapFitnessHoldingsIncMember	whf:SnapFitnessHoldingsIncMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanCMember	whf:FirstLienSecuredTermLoanCMember	whf:FirstLienSecuredTermLoanCMember	whf:FirstLienSecuredTermLoanCMember	whf:FirstLienSecuredTermLoanCMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Leisure Facilities [Member]	Leisure Facilities [Member]	Leisure Facilities [Member]	Leisure Facilities [Member]	Leisure Facilities [Member]
Investment, Basis Spread, Variable Rate	9.50%	9.50%	9.50%	9.50%	9.50%
Investment Interest Rate	9.50%	9.50%	9.50%	9.50%	9.50%
Investment, Acquisition Date	Jun. 29, 2020	Jun. 29, 2020
Investment Owned, Balance, Principal Amount	$ 1,268	$ 1,268
Investment Owned, at Cost	1,265	1,265
Investment Owned, at Fair Value	$ 1,084	$ 1,219
Investment, Interest Rate, Paid in Kind	9.50%	9.50%	9.50%	9.50%	9.50%
Investment, Interest Rate, Paid in Cash	0%	0%	0%	0%	0%
Investment, Identifier [Axis]: Snap Fitness Holdings, Inc Warrants
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:SnapFitnessHoldingsIncMember	whf:SnapFitnessHoldingsIncMember
Investment, Type [Extensible Enumeration]	Warrant [Member]	Warrant [Member]	Warrant [Member]	Warrant [Member]	Warrant [Member]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Leisure Facilities [Member]	Leisure Facilities [Member]	Leisure Facilities [Member]	Leisure Facilities [Member]	Leisure Facilities [Member]
Investment, Acquisition Date	Jun. 29, 2020	Jun. 29, 2020
Investment Maturity Date	Jun. 28, 2028	Jun. 28, 2028	Jun. 28, 2028	Jun. 28, 2028	Jun. 28, 2028
Investment Owned, Balance, Principal Amount	$ 1	$ 1
Investment Owned, at Cost	793	793
Investment Owned, at Fair Value	$ 64	$ 76
Investment, Identifier [Axis]: Solar Holdings Bidco Limited First Lien Secured Delayed Draw Loan Interest Rate 8.94
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	Solar Holdings Bidco Limited
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredDelayedDrawLoanMember		whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Environmental & Facilities Services		Environmental & Facilities Services	Environmental & Facilities Services
Investment, Variable Interest Rate, Type [Extensible Enumeration]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]		Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
Investment, Interest Rate, Floor	0.50%		0.50%	0.50%
Investment, Basis Spread, Variable Rate	6.75%		6.75%	6.75%
Investment Interest Rate	9.74%		9.74%	9.74%
Investment, Acquisition Date	Sep. 30, 2022
Investment Maturity Date	Sep. 28, 2029		Sep. 28, 2029	Sep. 28, 2029
Investment Owned, at Fair Value	$ (10)
Investment, Identifier [Axis]: Solar Holdings Bidco Limited First Lien Secured Delayed Draw Loan Interest Rate 9.74
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	Solar Holdings Bidco Limited
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredDelayedDrawLoanMember		whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Environmental & Facilities Services		Environmental & Facilities Services	Environmental & Facilities Services
Investment, Variable Interest Rate, Type [Extensible Enumeration]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]		Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
Investment, Interest Rate, Floor	0.50%		0.50%	0.50%
Investment, Basis Spread, Variable Rate	6.75%		6.75%	6.75%
Investment Interest Rate	9.74%		9.74%	9.74%
Investment, Acquisition Date	Sep. 30, 2022
Investment Maturity Date	Sep. 28, 2029		Sep. 28, 2029	Sep. 28, 2029
Investment Owned, Balance, Principal Amount	$ 53
Investment Owned, at Cost	51
Investment Owned, at Fair Value	$ 51
Investment, Identifier [Axis]: Solar Holdings Bidco Limited First Lien Secured Term Loan CDOR
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	Solar Holdings Bidco Limited
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Environmental & Facilities Services		Environmental & Facilities Services	Environmental & Facilities Services
Investment, Variable Interest Rate, Type [Extensible Enumeration]	CanadianDollarOfferedRateMember		CanadianDollarOfferedRateMember	CanadianDollarOfferedRateMember
Investment, Interest Rate, Floor	0.50%		0.50%	0.50%
Investment, Basis Spread, Variable Rate	6.75%		6.75%	6.75%
Investment Interest Rate	10.92%		10.92%	10.92%
Investment, Acquisition Date	Sep. 30, 2022
Investment Maturity Date	Sep. 28, 2029		Sep. 28, 2029	Sep. 28, 2029
Investment Owned, Balance, Principal Amount			$ 3,839
Investment Owned, at Cost	$ 2,726
Investment Owned, at Fair Value	$ 2,704
Investment, Identifier [Axis]: Solar Holdings Bidco Limited First Lien Secured Term Loan SF
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	Solar Holdings Bidco Limited
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Environmental & Facilities Services		Environmental & Facilities Services	Environmental & Facilities Services
Investment, Variable Interest Rate, Type [Extensible Enumeration]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]		Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
Investment, Interest Rate, Floor	0.50%		0.50%	0.50%
Investment, Basis Spread, Variable Rate	6.75%		6.75%	6.75%
Investment Interest Rate	9.74%		9.74%	9.74%
Investment, Acquisition Date	Sep. 30, 2022
Investment Maturity Date	Sep. 28, 2029		Sep. 28, 2029	Sep. 28, 2029
Investment Owned, Balance, Principal Amount	$ 2,783
Investment Owned, at Cost	2,706
Investment Owned, at Fair Value	$ 2,706
Investment, Identifier [Axis]: Solar Holdings Bidco Limited First Lien Secured Term Loan SONIA
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	Solar Holdings Bidco Limited
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Environmental & Facilities Services		Environmental & Facilities Services	Environmental & Facilities Services
Investment, Variable Interest Rate, Type [Extensible Enumeration]	whf:SterlingOvernightIndexAverageMember		whf:SterlingOvernightIndexAverageMember	whf:SterlingOvernightIndexAverageMember
Investment, Interest Rate, Floor	0%		0%	0%
Investment, Basis Spread, Variable Rate	6.75%		6.75%	6.75%
Investment Interest Rate	8.94%		8.94%	8.94%
Investment, Acquisition Date	Sep. 30, 2022
Investment Maturity Date	Sep. 28, 2029		Sep. 28, 2029	Sep. 28, 2029
Investment Owned, Balance, Principal Amount | £				£ 169
Investment Owned, at Cost	$ 182
Investment Owned, at Fair Value	$ 184
Investment, Identifier [Axis]: Source Code Holdings, LLC , First Lien Secured Delayed Draw Loan, Floor 1.00%, Spread L plus 6.50%, Rate 7.50%, Due 7/30/2027
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]		whf:SourceCodeHoldingsLLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredDelayedDrawLoanMember			whf:FirstLienSecuredDelayedDrawLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Technology Hardware, Storage & Peripherals			Technology Hardware, Storage & Peripherals
Investment, Interest Rate, Floor		1%			1%
Investment, Basis Spread, Variable Rate		6.50%			6.50%
Investment Interest Rate		7.50%			7.50%
Investment, Acquisition Date		Aug. 10, 2021
Investment Maturity Date		Jul. 30, 2027			Jul. 30, 2027
Investment Owned, at Fair Value		$ 1
Investment, Identifier [Axis]: Source Code Holdings, LLC , First Lien Secured Term Loan, Floor 1.00%, Spread L plus 6.50%, Rate 7.50%, Due 7/30/2027
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]		whf:SourceCodeHoldingsLLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Technology Hardware, Storage & Peripherals			Technology Hardware, Storage & Peripherals
Investment, Interest Rate, Floor		1%			1%
Investment, Basis Spread, Variable Rate		6.50%			6.50%
Investment Interest Rate		7.50%			7.50%
Investment, Acquisition Date		Aug. 10, 2021
Investment Maturity Date		Jul. 30, 2027			Jul. 30, 2027
Investment Owned, Balance, Principal Amount		$ 7,629
Investment Owned, at Cost		7,487
Investment Owned, at Fair Value		$ 7,489
Investment, Identifier [Axis]: Source Code Holdings, LLC First Lien Secured Delayed Draw Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:SourceCodeHoldingsLLCMember	whf:SourceCodeHoldingsLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Technology Hardware, Storage & Peripherals	Technology Hardware, Storage & Peripherals	Technology Hardware, Storage & Peripherals	Technology Hardware, Storage & Peripherals	Technology Hardware, Storage & Peripherals
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor	1%	1%	1%	1%	1%
Investment, Basis Spread, Variable Rate	6.50%	6.50%	6.50%	6.50%	6.50%
Investment Interest Rate	9.63%	7.50%	9.63%	9.63%	7.50%
Investment, Acquisition Date	Aug. 10, 2021	Jul. 30, 2021
Investment Maturity Date	Jul. 30, 2027	Jul. 30, 2027	Jul. 30, 2027	Jul. 30, 2027	Jul. 30, 2027
Investment Owned, at Fair Value	$ 21
Investment, Identifier [Axis]: Source Code Holdings, LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:SourceCodeHoldingsLLCMember	whf:SourceCodeHoldingsLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Technology Hardware, Storage & Peripherals	Technology Hardware, Storage & Peripherals	Technology Hardware, Storage & Peripherals	Technology Hardware, Storage & Peripherals	Technology Hardware, Storage & Peripherals
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor	1%	1%	1%	1%	1%
Investment, Basis Spread, Variable Rate	6.50%	6.50%	6.50%	6.50%	6.50%
Investment Interest Rate	9.63%	7.50%	9.63%	9.63%	7.50%
Investment, Acquisition Date	Aug. 10, 2021	Jul. 30, 2021
Investment Maturity Date	Jul. 30, 2027	Jul. 30, 2027	Jul. 30, 2027	Jul. 30, 2027	Jul. 30, 2027
Investment Owned, Balance, Principal Amount	$ 15,143	$ 7,629
Investment Owned, at Cost	14,899	7,487
Investment Owned, at Fair Value	$ 14,970	$ 7,489
Investment, Identifier [Axis]: Stella and Chewy's LLC, First Lien Secured Delayed Draw Loan, Floor 1.00%, Spread L plus 6.75%, Rate 7.75%, Due 12/16/2025
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:StellaandChewysLLCMember	whf:StellaandChewysLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Packaged Foods & Meats	Packaged Foods & Meats	Packaged Foods & Meats	Packaged Foods & Meats	Packaged Foods & Meats
Investment, Interest Rate, Floor	1%	1%	1%	1%	1%
Investment, Basis Spread, Variable Rate	8.75%	6.75%	8.75%	8.75%	6.75%
Investment Interest Rate	11.92%	7.75%	11.92%	11.92%	7.75%
Investment, Acquisition Date	Mar. 26, 2021	Dec. 29, 2020
Investment Maturity Date	Dec. 16, 2025	Dec. 16, 2025	Dec. 16, 2025	Dec. 16, 2025	Dec. 16, 2025
Investment Owned, Balance, Principal Amount	$ 1,367	$ 1,893
Investment Owned, at Cost	1,354	1,877
Investment Owned, at Fair Value	$ 1,326	$ 1,697
Investment, Interest Rate, Paid in Kind	2%		2%	2%
Investment, Interest Rate, Paid in Cash	9.92%		9.92%	9.92%
Investment, Identifier [Axis]: Stella and Chewy's LLC, First Lien Secured Term Loan, Floor 1.00%, Spread L plus 6.75%, Rate 7.75%, Due 12/16/2025
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:StellaandChewysLLCMember	whf:StellaandChewysLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Packaged Foods & Meats	Packaged Foods & Meats	Packaged Foods & Meats	Packaged Foods & Meats	Packaged Foods & Meats
Investment, Interest Rate, Floor	1%	1%	1%	1%	1%
Investment, Basis Spread, Variable Rate	8.75%	6.75%	8.75%	8.75%	6.75%
Investment Interest Rate	12.24%	7.75%	12.24%	12.24%	7.75%
Investment, Acquisition Date	Dec. 29, 2020	Dec. 29, 2020
Investment Maturity Date	Dec. 16, 2025	Dec. 16, 2025	Dec. 16, 2025	Dec. 16, 2025	Dec. 16, 2025
Investment Owned, Balance, Principal Amount	$ 3,874	$ 5,313
Investment Owned, at Cost	3,826	5,228
Investment Owned, at Fair Value	$ 3,758	$ 4,967
Investment, Interest Rate, Paid in Kind	2%		2%	2%
Investment, Interest Rate, Paid in Cash	10.24%		10.24%	10.24%
Investment, Identifier [Axis]: Sunless, Inc First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:SunlessInc.Member
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Personal Products		Personal Products	Personal Products
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]		London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor	1%		1%	1%
Investment, Basis Spread, Variable Rate	6.50%		6.50%	6.50%
Investment Interest Rate	10.17%		10.17%	10.17%
Investment, Acquisition Date	Jun. 30, 2022
Investment Maturity Date	Aug. 13, 2025		Aug. 13, 2025	Aug. 13, 2025
Investment Owned, Balance, Principal Amount	$ 2,092
Investment Owned, at Cost	2,053
Investment Owned, at Fair Value	$ 2,063
Investment, Identifier [Axis]: Sunless, Inc., First Lien Secured Revolving Loan, Floor 1.00%, Spread L plus 6.00%, Rate 7.00%, Due 8/13/2024
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:SunlessInc.Member	whf:SunlessIncMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Personal Products	Personal Products	Personal Products	Personal Products	Personal Products
Investment, Interest Rate, Floor	1%	1%	1%	1%	1%
Investment, Basis Spread, Variable Rate	6.50%	6%	6.50%	6.50%	6%
Investment Interest Rate	10.17%	7%	10.17%	10.17%	7%
Investment, Acquisition Date	Oct. 21, 2019	Oct. 21, 2019
Investment Maturity Date	Aug. 13, 2025	Aug. 13, 2024	Aug. 13, 2025	Aug. 13, 2025	Aug. 13, 2024
Investment Owned, at Fair Value	$ 7	$ 14
Investment, Identifier [Axis]: Sunless, Inc., First Lien Secured Term Loan, Floor 1.00%, Spread L plus 6.00%, Rate 7.00%, Due 8/13/2024
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:SunlessInc.Member	whf:SunlessIncMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Personal Products	Personal Products	Personal Products	Personal Products	Personal Products
Investment, Interest Rate, Floor	1%	1%	1%	1%	1%
Investment, Basis Spread, Variable Rate	6.50%	6%	6.50%	6.50%	6%
Investment Interest Rate	10.17%	7%	10.17%	10.17%	7%
Investment, Acquisition Date	Oct. 21, 2019	Oct. 21, 2019
Investment Maturity Date	Aug. 13, 2025	Aug. 13, 2024	Aug. 13, 2025	Aug. 13, 2025	Aug. 13, 2024
Investment Owned, Balance, Principal Amount	$ 3,691	$ 4,259
Investment Owned, at Cost	3,639	4,185
Investment Owned, at Fair Value	$ 3,691	$ 4,259
Investment, Identifier [Axis]: Sure Fit Home Products, LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]		whf:SureFitHomeProductsLLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Home Furnishings [Member]			Home Furnishings [Member]
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor		1%			1%
Investment, Basis Spread, Variable Rate		9.75%			9.75%
Investment Interest Rate		10.75%			10.75%
Investment, Acquisition Date		Apr. 12, 2021
Investment Maturity Date		Jul. 13, 2023			Jul. 13, 2023
Investment Owned, Balance, Principal Amount		$ 4,912
Investment Owned, at Cost		4,828
Investment Owned, at Fair Value		$ 4,372
Investment, Identifier [Axis]: TOUR Intermediate Holdings, LLC, First Lien Secured Delayed Draw Loan, Floor 1.00%, Spread L plus 6.50%, Rate 7.50%, Due 5/15/2025
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:TOURIntermediateHoldingsLLCMember	whf:TOURIntermediateHoldingsLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Investment Banking & Brokerage	Investment Banking & Brokerage	Investment Banking & Brokerage	Investment Banking & Brokerage	Investment Banking & Brokerage
Investment, Interest Rate, Floor	1%	1%	1%	1%	1%
Investment, Basis Spread, Variable Rate	6.50%	6.50%	6.50%	6.50%	6.50%
Investment Interest Rate	9.62%	7.50%	9.62%	9.62%	7.50%
Investment, Acquisition Date	May 19, 2020	May 19, 2020
Investment Maturity Date	May 15, 2025	May 15, 2025	May 15, 2025	May 15, 2025	May 15, 2025
Investment Owned, Balance, Principal Amount	$ 2,505	$ 2,616
Investment Owned, at Cost	2,493	2,600
Investment Owned, at Fair Value	$ 2,505	$ 2,616
Investment, Identifier [Axis]: TOUR Intermediate Holdings, LLC, First Lien Secured Term Loan, Floor 1.00%, Spread L plus 6.50%, Rate 7.50%, Due 5/15/2025
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:TOURIntermediateHoldingsLLCMember	whf:TOURIntermediateHoldingsLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Investment Banking & Brokerage	Investment Banking & Brokerage	Investment Banking & Brokerage	Investment Banking & Brokerage	Investment Banking & Brokerage
Investment, Interest Rate, Floor	1%	1%	1%	1%	1%
Investment, Basis Spread, Variable Rate	6.50%	6.50%	6.50%	6.50%	6.50%
Investment Interest Rate	9.62%	7.50%	9.62%	9.62%	7.50%
Investment, Acquisition Date	May 19, 2020	May 19, 2020
Investment Maturity Date	May 15, 2025	May 15, 2025	May 15, 2025	May 15, 2025	May 15, 2025
Investment Owned, Balance, Principal Amount	$ 3,182	$ 7,438
Investment Owned, at Cost	3,150	7,343
Investment Owned, at Fair Value	$ 3,182	$ 7,438
Investment, Identifier [Axis]: Team Car Care Holdings, First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:TeamCarCareHoldingsLLCMember	whf:TeamCarCareHoldingsLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Automotive Retail [Member]	Automotive Retail [Member]	Automotive Retail [Member]	Automotive Retail [Member]	Automotive Retail [Member]
Investment, Variable Interest Rate, Type [Extensible Enumeration]	us-gaap:BaseRateMember	us-gaap:BaseRateMember	us-gaap:BaseRateMember	us-gaap:BaseRateMember	us-gaap:BaseRateMember
Investment, Interest Rate, Floor	1%	1.03%	1%	1%	1.03%
Investment, Basis Spread, Variable Rate	7.98%	7.98%	7.98%	7.98%	7.98%
Investment Interest Rate	10.39%	9.02%	10.39%	10.39%	9.02%
Investment, Acquisition Date	Feb. 16, 2018	Feb. 16, 2018
Investment Maturity Date	Jun. 28, 2024	Jun. 28, 2024	Jun. 28, 2024	Jun. 28, 2024	Jun. 28, 2024
Investment Owned, Balance, Principal Amount	$ 14,594	$ 15,286
Investment Owned, at Cost	14,532	15,193
Investment Owned, at Fair Value	$ 14,594	$ 15,286
Investment, Identifier [Axis]: Telestream Holdings Corporation First Lien Secured Delayed Draw Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	Telestream Holdings Corporation [Member]
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredDelayedDrawLoanMember		whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Technology Hardware, Storage & Peripherals		Technology Hardware, Storage & Peripherals	Technology Hardware, Storage & Peripherals
Investment, Variable Interest Rate, Type [Extensible Enumeration]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]		Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
Investment, Interest Rate, Floor	1%		1%	1%
Investment, Basis Spread, Variable Rate	9.25%		9.25%	9.25%
Investment Interest Rate	12.30%		12.30%	12.30%
Investment, Acquisition Date	May 12, 2022
Investment Maturity Date	Oct. 15, 2025		Oct. 15, 2025	Oct. 15, 2025
Investment, Identifier [Axis]: Telestream Holdings Corporation First Lien Secured Revolving Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	Telestream Holdings Corporation [Member]	Telestream Holdings Corporation [Member]
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Technology Hardware, Storage & Peripherals	Technology Hardware, Storage & Peripherals	Technology Hardware, Storage & Peripherals	Technology Hardware, Storage & Peripherals	Technology Hardware, Storage & Peripherals
Investment, Variable Interest Rate, Type [Extensible Enumeration]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	London Interbank Offered Rate (LIBOR) [Member]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor	1%	1%	1%	1%	1%
Investment, Basis Spread, Variable Rate	9.25%	8.75%	9.25%	9.25%	8.75%
Investment Interest Rate	12.30%	9.75%	12.30%	12.30%	9.75%
Investment, Acquisition Date	Oct. 15, 2020	Oct. 15, 2020
Investment Maturity Date	Oct. 15, 2025	Oct. 15, 2025	Oct. 15, 2025	Oct. 15, 2025	Oct. 15, 2025
Investment Owned, Balance, Principal Amount	$ 927	$ 530
Investment Owned, at Cost	909	517
Investment Owned, at Fair Value	$ 935	$ 549
Investment, Identifier [Axis]: Telestream Holdings Corporation First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	Telestream Holdings Corporation [Member]	Telestream Holdings Corporation [Member]
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Technology Hardware, Storage & Peripherals	Technology Hardware, Storage & Peripherals	Technology Hardware, Storage & Peripherals	Technology Hardware, Storage & Peripherals	Technology Hardware, Storage & Peripherals
Investment, Variable Interest Rate, Type [Extensible Enumeration]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	London Interbank Offered Rate (LIBOR) [Member]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor	1%	1%	1%	1%	1%
Investment, Basis Spread, Variable Rate	9.25%	8.75%	9.25%	9.25%	8.75%
Investment Interest Rate	12.11%	9.75%	12.11%	12.11%	9.75%
Investment, Acquisition Date	Oct. 15, 2020	Oct. 15, 2020
Investment Maturity Date	Oct. 15, 2025	Oct. 15, 2025	Oct. 15, 2025	Oct. 15, 2025	Oct. 15, 2025
Investment Owned, Balance, Principal Amount	$ 15,886	$ 15,079
Investment Owned, at Cost	15,570	14,713
Investment Owned, at Fair Value	$ 15,874	$ 15,079
Investment, Identifier [Axis]: Tensar Corporation First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]		whf:TensarCorporationMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Construction & Engineering			Construction & Engineering
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor		1%			1%
Investment, Basis Spread, Variable Rate		6.75%			6.75%
Investment Interest Rate		7.75%			7.75%
Investment, Acquisition Date		Nov. 20, 2020
Investment Maturity Date		Aug. 20, 2025			Aug. 20, 2025
Investment Owned, Balance, Principal Amount		$ 6,930
Investment Owned, at Cost		6,797
Investment Owned, at Fair Value		$ 7,069
Investment, Identifier [Axis]: Tensar Corporation, First Lien Secured Term Loan, Floor 1.00%, Spread L plus 6.75%, Rate 7.75%, Due 8/20/2025
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]		whf:TensarCorporationMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Construction & Engineering			Construction & Engineering
Investment, Interest Rate, Floor		1%			1%
Investment, Basis Spread, Variable Rate		6.75%			6.75%
Investment Interest Rate		7.75%			7.75%
Investment, Acquisition Date		Nov. 24, 2020
Investment Maturity Date		Aug. 20, 2025			Aug. 20, 2025
Investment Owned, Balance, Principal Amount		$ 6,930
Investment Owned, at Cost		6,797
Investment Owned, at Fair Value		$ 7,069
Investment, Identifier [Axis]: The Kyjen Company, LLC First Lien Secured Revolving Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:TheKyjenCompanyLLCMember	whf:TheKyjenCompanyLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Household Products [Member]	Household Products [Member]	Household Products [Member]	Household Products [Member]	Household Products [Member]
Investment, Variable Interest Rate, Type [Extensible Enumeration]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	London Interbank Offered Rate (LIBOR) [Member]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor	1%	1%	1%	1%	1%
Investment, Basis Spread, Variable Rate	7%	6.50%	7%	7%	6.50%
Investment Interest Rate	9.88%	7.50%	9.88%	9.88%	7.50%
Investment, Acquisition Date	Apr. 05, 2021	Apr. 05, 2021
Investment Maturity Date	Apr. 05, 2026	Apr. 05, 2026	Apr. 05, 2026	Apr. 05, 2026	Apr. 05, 2026
Investment Owned, Balance, Principal Amount	$ 676	$ 385
Investment Owned, at Cost	669	380
Investment Owned, at Fair Value	$ 632	$ 390
Investment, Interest Rate, Paid in Kind	0.50%		0.50%	0.50%
Investment, Interest Rate, Paid in Cash	9.38%		9.38%	9.38%
Investment, Identifier [Axis]: The Kyjen Company, LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:TheKyjenCompanyLLCMember	whf:TheKyjenCompanyLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Household Products [Member]	Household Products [Member]	Household Products [Member]	Household Products [Member]	Household Products [Member]
Investment, Variable Interest Rate, Type [Extensible Enumeration]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	London Interbank Offered Rate (LIBOR) [Member]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor	1%	1%	1%	1%	1%
Investment, Basis Spread, Variable Rate	7%	6.50%	7%	7%	6.50%
Investment Interest Rate	10.31%	7.50%	10.31%	10.31%	7.50%
Investment, Acquisition Date	Apr. 05, 2021	Apr. 05, 2021
Investment Maturity Date	Apr. 05, 2026	Apr. 05, 2026	Apr. 05, 2026	Apr. 05, 2026	Apr. 05, 2026
Investment Owned, Balance, Principal Amount	$ 11,347	$ 11,403
Investment Owned, at Cost	11,228	11,257
Investment Owned, at Fair Value	$ 10,782	$ 11,383
Investment, Interest Rate, Paid in Kind	0.50%		0.50%	0.50%
Investment, Interest Rate, Paid in Cash	9.81%		9.81%	9.81%
Investment, Identifier [Axis]: Token Buyer, Inc First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:TokenBuyerIncMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Household Appliances		Household Appliances	Household Appliances
Investment, Variable Interest Rate, Type [Extensible Enumeration]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]		Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
Investment, Interest Rate, Floor	0.50%		0.50%	0.50%
Investment, Basis Spread, Variable Rate	6%		6%	6%
Investment Interest Rate	9.70%		9.70%	9.70%
Investment, Acquisition Date	May 26, 2022
Investment Maturity Date	May 31, 2029		May 31, 2029	May 31, 2029
Investment Owned, Balance, Principal Amount	$ 6,540
Investment Owned, at Cost	6,040
Investment Owned, at Fair Value	$ 6,003
Investment, Identifier [Axis]: Trimlite Buyer LLC First Lien Secured Revolving Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]		whf:TrimliteBuyerLLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredRevolvingLoanMember			whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Building Products			Building Products
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor		1%			1%
Investment, Basis Spread, Variable Rate		6.50%			6.50%
Investment Interest Rate		7.50%			7.50%
Investment, Acquisition Date		Jul. 27, 2021
Investment Maturity Date		Jul. 27, 2026			Jul. 27, 2026
Investment Owned, Balance, Principal Amount		$ 164
Investment Owned, at Cost		161
Investment Owned, at Fair Value		$ 161
Investment, Identifier [Axis]: Trimlite Buyer LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:TrimliteBuyerLLCMember	whf:TrimliteBuyerLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Building Products	Building Products	Building Products	Building Products	Building Products
Investment, Variable Interest Rate, Type [Extensible Enumeration]	CanadianDollarOfferedRateMember	CanadianDollarOfferedRateMember	CanadianDollarOfferedRateMember	CanadianDollarOfferedRateMember	CanadianDollarOfferedRateMember
Investment, Interest Rate, Floor	1%	1%	1%	1%	1%
Investment, Basis Spread, Variable Rate	6.50%	6.50%	6.50%	6.50%	6.50%
Investment Interest Rate	10.67%	7.50%	10.67%	10.67%	7.50%
Investment, Acquisition Date	Jul. 27, 2021	Jul. 27, 2021
Investment Maturity Date	Jul. 27, 2026	Jul. 27, 2026	Jul. 27, 2026	Jul. 27, 2026	Jul. 27, 2026
Investment Owned, Balance, Principal Amount		$ 22,977	$ 22,544
Investment Owned, at Cost	$ 17,681	17,975
Investment Owned, at Fair Value	$ 16,175	$ 17,841
Investment, Identifier [Axis]: True Blue Car Wash, LLC First Lien Secured Delayed Draw Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:TrueBlueCarWashLLCMember	whf:TrueBlueCarWashLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Specialized Consumer Services [Member]	Specialized Consumer Services [Member]	Specialized Consumer Services [Member]	Specialized Consumer Services [Member]	Specialized Consumer Services [Member]
Investment, Variable Interest Rate, Type [Extensible Enumeration]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	London Interbank Offered Rate (LIBOR) [Member]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor	1%	1%	1%	1%	1%
Investment, Basis Spread, Variable Rate	6.50%	6.82%	6.50%	6.50%	6.82%
Investment Interest Rate	9.55%	7.82%	9.55%	9.55%	7.82%
Investment, Acquisition Date	Oct. 17, 2019	Oct. 17, 2019
Investment Maturity Date	Oct. 17, 2024	Oct. 17, 2024	Oct. 17, 2024	Oct. 17, 2024	Oct. 17, 2024
Investment Owned, Balance, Principal Amount	$ 4,186	$ 3,103
Investment Owned, at Cost	4,124	3,073
Investment Owned, at Fair Value	$ 4,103	$ 3,098
Investment, Identifier [Axis]: True Blue Car Wash, LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:TrueBlueCarWashLLCMember	whf:TrueBlueCarWashLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Specialized Consumer Services [Member]	Specialized Consumer Services [Member]	Specialized Consumer Services [Member]	Specialized Consumer Services [Member]	Specialized Consumer Services [Member]
Investment, Variable Interest Rate, Type [Extensible Enumeration]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	London Interbank Offered Rate (LIBOR) [Member]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor	1%	1%	1%	1%	1%
Investment, Basis Spread, Variable Rate	6.88%	6.82%	6.88%	6.88%	6.82%
Investment Interest Rate	10.01%	7.82%	10.01%	10.01%	7.82%
Investment, Acquisition Date	Oct. 17, 2019	Oct. 17, 2019
Investment Maturity Date	Oct. 17, 2024	Oct. 17, 2024	Oct. 17, 2024	Oct. 17, 2024	Oct. 17, 2024
Investment Owned, Balance, Principal Amount	$ 9,969	$ 8,203
Investment Owned, at Cost	9,876	8,087
Investment Owned, at Fair Value	$ 9,898	$ 8,130
Investment, Identifier [Axis]: Turnberry Solutions, Inc., First Lien Secured Revolving Loan, Floor 3.25%, Spread P plus 5.00%, Rate 8.25%, Due 9/2/2026
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:TurnberrySolutionsInc.Member	whf:TurnberrySolutionsInc.Member
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	IT Consulting And Other Services	IT Consulting And Other Services	IT Consulting And Other Services	IT Consulting And Other Services	IT Consulting And Other Services
Investment, Interest Rate, Floor	1%	3.25%	1%	1%	3.25%
Investment, Basis Spread, Variable Rate	5%	5%	5%	5%	5%
Investment Interest Rate	11.25%	8.25%	11.25%	11.25%	8.25%
Investment, Acquisition Date	Aug. 10, 2021	Aug. 10, 2021
Investment Maturity Date	Sep. 02, 2026	Sep. 02, 2026	Sep. 02, 2026	Sep. 02, 2026	Sep. 02, 2026
Investment Owned, Balance, Principal Amount	$ 22	$ 86
Investment Owned, at Cost	21	84
Investment Owned, at Fair Value	$ 17	$ 85
Investment, Identifier [Axis]: Turnberry Solutions, Inc., First Lien Secured Term Loan, Floor 1.00%, Spread L plus 6.00%, Rate 7.00%, Due 9/2/2026
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:TurnberrySolutionsInc.Member	whf:TurnberrySolutionsInc.Member
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	IT Consulting And Other Services	IT Consulting And Other Services	IT Consulting And Other Services	IT Consulting And Other Services	IT Consulting And Other Services
Investment, Interest Rate, Floor	1%	1%	1%	1%	1%
Investment, Basis Spread, Variable Rate	6%	6%	6%	6%	6%
Investment Interest Rate	9.19%	7%	9.19%	9.19%	7%
Investment, Acquisition Date	Aug. 10, 2021	Aug. 10, 2021
Investment Maturity Date	Sep. 02, 2026	Sep. 02, 2026	Sep. 02, 2026	Sep. 02, 2026	Sep. 02, 2026
Investment Owned, Balance, Principal Amount	$ 6,103	$ 5,791
Investment Owned, at Cost	6,008	5,689
Investment Owned, at Fair Value	$ 5,973	$ 5,684
Investment, Identifier [Axis]: Unleashed Brands, LLC, First Lien Secured Delayed Draw Loan, Floor 1.00%, Spread L plus 6.56%, Rate 7.17%, Due 11/19/2026
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:UnleashedBrandsLLCMember	whf:UnleashedBrandsLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Leisure Products	Leisure Products	Leisure Products	Leisure Products	Leisure Products
Investment, Interest Rate, Floor	1%	1%	1%	1%	1%
Investment, Basis Spread, Variable Rate	5.50%	5.50%	5.50%	5.50%	5.50%
Investment Interest Rate	8.62%	6.50%	8.62%	8.62%	6.50%
Investment, Acquisition Date	Nov. 30, 2021	Nov. 30, 2021
Investment Maturity Date	Nov. 19, 2026	Nov. 19, 2026	Nov. 19, 2026	Nov. 19, 2026	Nov. 19, 2026
Investment Owned, Balance, Principal Amount	$ 5,133	$ 5,133
Investment Owned, at Cost	5,091	5,083
Investment Owned, at Fair Value	$ 5,151	$ 5,082
Investment, Identifier [Axis]: Unleashed Brands, LLC, First Lien Secured Revolving Loan, Floor 1.00%, Spread L plus 6.56%, Rate 7.17%, Due 11/19/2026
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:UnleashedBrandsLLCMember	whf:UnleashedBrandsLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Leisure Products	Leisure Products	Leisure Products	Leisure Products	Leisure Products
Investment, Interest Rate, Floor	1%	1%	1%	1%	1%
Investment, Basis Spread, Variable Rate	5.50%	5.50%	5.50%	5.50%	5.50%
Investment Interest Rate	8.62%	6.50%	8.62%	8.62%	6.50%
Investment, Acquisition Date	Nov. 30, 2021	Nov. 30, 2021
Investment Maturity Date	Nov. 19, 2026	Nov. 19, 2026	Nov. 19, 2026	Nov. 19, 2026	Nov. 19, 2026
Investment Owned, at Fair Value	$ 6
Investment, Identifier [Axis]: Unleashed Brands, LLC, First lien Secured Term Loan, Floor 1.00%, Spread L plus 5.50%, Rate 7.17%, Due 11/19/2026
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:UnleashedBrandsLLCMember	whf:UnleashedBrandsLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Leisure Products	Leisure Products	Leisure Products	Leisure Products	Leisure Products
Investment, Interest Rate, Floor	1%	1%	1%	1%	1%
Investment, Basis Spread, Variable Rate	5.50%	5.50%	5.50%	5.50%	5.50%
Investment Interest Rate	8.62%	6.50%	8.62%	8.62%	6.50%
Investment, Acquisition Date	Nov. 30, 2021	Nov. 30, 2021
Investment Maturity Date	Nov. 19, 2026	Nov. 19, 2026	Nov. 19, 2026	Nov. 19, 2026	Nov. 19, 2026
Investment Owned, Balance, Principal Amount	$ 3,887	$ 3,887
Investment Owned, at Cost	3,854	3,848
Investment Owned, at Fair Value	$ 3,887	$ 3,848
Investment, Identifier [Axis]: WH Lessor Corp., First Lien Secured Revolving Loan, Floor 1.00%, Spread L plus 6.00%, Rate 7.00%, Due 12/26/2024
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:JuniperLandscapingHoldingsLLCMember	whf:WHLessorCorpMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Environmental & Facilities Services	Environmental & Facilities Services	Environmental & Facilities Services	Environmental & Facilities Services	Environmental & Facilities Services
Investment, Interest Rate, Floor	1%	1%	1%	1%	1%
Investment, Basis Spread, Variable Rate	5.59%	6%	5.59%	5.59%	6%
Investment Interest Rate	8.70%	7%	8.70%	8.70%	7%
Investment, Acquisition Date	Jan. 22, 2020	Jan. 22, 2020
Investment Maturity Date	Dec. 26, 2024	Dec. 26, 2024	Dec. 26, 2024	Dec. 26, 2024	Dec. 26, 2024
Investment Owned, at Fair Value	$ 5	$ 6
Investment, Identifier [Axis]: WH Lessor Corp., First Lien Secured Term Loan, Floor 1.00%, Spread L plus 6.00%, Rate 7.00%, Due 12/26/2024
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:JuniperLandscapingHoldingsLLCMember	whf:WHLessorCorpMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Environmental & Facilities Services	Environmental & Facilities Services	Environmental & Facilities Services	Environmental & Facilities Services	Environmental & Facilities Services
Investment, Interest Rate, Floor	1%	1%	1%	1%	1%
Investment, Basis Spread, Variable Rate	5.59%	6%	5.59%	5.59%	6%
Investment Interest Rate	8.70%	7%	8.70%	8.70%	7%
Investment, Acquisition Date	Jan. 22, 2020	Jan. 22, 2020
Investment Maturity Date	Dec. 26, 2024	Dec. 26, 2024	Dec. 26, 2024	Dec. 26, 2024	Dec. 26, 2024
Investment Owned, Balance, Principal Amount	$ 7,490	$ 6,870
Investment Owned, at Cost	7,412	6,780
Investment Owned, at Fair Value	$ 7,489	$ 6,866
Investment, Identifier [Axis]: WHF STRS Ohio Senior Loan Fund LLC Equity
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:WHFSTRSOhioSeniorLoanFundLLCMember	whf:WHFSTRSOhioSeniorLoanFundLLCMember
Investment, Type [Extensible Enumeration]	Equity Investments	Equity Investments	Equity Investments	Equity Investments	Equity Investments
Investment Owned, at Fair Value	$ 22,066	$ 15,607				10,167
Investment, Identifier [Axis]: WHF STRS Ohio Senior Loan Fund LLC Interests
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:WHFSTRSOhioSeniorLoanFundMember	whf:WHFSTRSOhioSeniorLoanFundMember
Investment, Type [Extensible Enumeration]	whf:LLCInterestsMember	whf:LLCInterestsMember	whf:LLCInterestsMember	whf:LLCInterestsMember	whf:LLCInterestsMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Specialized Finance [Member]	Specialized Finance [Member]	Specialized Finance [Member]	Specialized Finance [Member]	Specialized Finance [Member]
Investment, Acquisition Date	Jul. 19, 2019	Jul. 19, 2019
Investment Owned, Balance, Principal Amount	$ 20,000	$ 15,000
Investment Owned, at Cost	20,000	15,000
Investment Owned, at Fair Value	$ 22,066	$ 15,607
Investment, Identifier [Axis]: WHF STRS Ohio Senior Loan Fund LLC Subordinated Note
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:WHFSTRSOhioSeniorLoanFundLLCMember	whf:WHFSTRSOhioSeniorLoanFundLLCMember
Investment, Type [Extensible Enumeration]	Subordinated Debt [Member]	Subordinated Debt [Member]	Subordinated Debt [Member]	Subordinated Debt [Member]	Subordinated Debt [Member]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Specialized Finance [Member]	Specialized Finance [Member]	Specialized Finance [Member]	Specialized Finance [Member]	Specialized Finance [Member]
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Investment, Basis Spread, Variable Rate	6.50%	6.50%	6.50%	6.50%	6.50%
Investment Interest Rate	9.13%	6.61%	9.13%	9.13%	6.61%
Investment, Acquisition Date	Jul. 19, 2019	Jul. 19, 2019
Investment Owned, Balance, Principal Amount	$ 80,000	$ 60,000
Investment Owned, at Cost	80,000	60,000
Investment Owned, at Fair Value	$ 80,000	$ 60,000				$ 41,073
Investment, Identifier [Axis]: Westrock Coffee Company, LLC, First Lien Secured Term Loan, Floor 1.50%, Spread L plus 8.50%, Rate Westrock Coffee Company, LLC, Due 2/28/2025
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]		whf:WestrockCoffeeCompanyLLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Packaged Foods & Meats			Packaged Foods & Meats
Investment, Interest Rate, Floor		1.50%			1.50%
Investment, Basis Spread, Variable Rate		8.50%			8.50%
Investment Interest Rate		10%			10%
Investment, Acquisition Date		Mar. 20, 2020
Investment Maturity Date		Feb. 28, 2025			Feb. 28, 2025
Investment Owned, Balance, Principal Amount		$ 9,105
Investment Owned, at Cost		9,033
Investment Owned, at Fair Value		$ 8,923
Investment, Interest Rate, Paid in Kind		0.25%			0.25%
Investment, Interest Rate, Paid in Cash		9.75%			9.75%
Investment, Identifier [Axis]: What If Holdings, LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]		whf:WhatIfHoldingsLLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Interactive Media And Services [Member]			Interactive Media And Services [Member]
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Investment, Interest Rate, Floor		1%			1%
Investment, Basis Spread, Variable Rate		6.50%			6.50%
Investment Interest Rate		7.50%			7.50%
Investment, Acquisition Date		Oct. 02, 2019
Investment Maturity Date		Oct. 02, 2024			Oct. 02, 2024
Investment Owned, Balance, Principal Amount		$ 18,848
Investment Owned, at Cost		18,609
Investment Owned, at Fair Value		$ 18,759
Investment, Identifier [Axis]: What If Media Group, LLC Common Units
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:WhatIfMediaGroupLLCMember	whf:WhatIfMediaGroupLLCMember
Investment, Type [Extensible Enumeration]	whf:CommonUnitsMember	whf:CommonUnitsMember	whf:CommonUnitsMember	whf:CommonUnitsMember	whf:CommonUnitsMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Interactive Media And Services [Member]	Interactive Media And Services [Member]	Interactive Media And Services [Member]	Interactive Media And Services [Member]	Interactive Media And Services [Member]
Investment, Acquisition Date	Jul. 02, 2021	Jul. 02, 2021
Investment Owned, Balance, Principal Amount	$ 851	$ 8
Investment Owned, at Cost	851	850
Investment Owned, at Fair Value	$ 2,327	$ 1,398

INVESTMENTS - Forward Currency

INVESTMENTS - Forward Currency Contracts (Details) € in Thousands, £ in Thousands, $ in Thousands, $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2022 USD ($)	Dec. 31, 2021 USD ($)	Sep. 30, 2022 CAD ($)	Sep. 30, 2022 GBP (£)	Sep. 30, 2022 EUR (€)	Dec. 31, 2021 CAD ($)	Dec. 31, 2021 GBP (£)
Schedule of Investments [Line Items]
Net Amount of Derivative Assets	$ 10
Open Forward Foreign Currency Contract, Identifier [Axis]: Forward Currency Contracts Morgan Stanley CAD Settlement Date 102822
Schedule of Investments [Line Items]
Counterparty	Morgan Stanley		Morgan Stanley	Morgan Stanley	Morgan Stanley
Currency to be sold			$ 348
Currency to be purchased	$ 270
Settlement Date	Oct. 28, 2022
Net Amount of Derivative Assets	$ 18
Open Forward Foreign Currency Contract, Identifier [Axis]: Forward Currency Contracts Morgan Stanley EURO Settlement Date 102822
Schedule of Investments [Line Items]
Counterparty	Morgan Stanley		Morgan Stanley	Morgan Stanley	Morgan Stanley
Currency to be sold | €					€ 1,383
Currency to be purchased	$ 1,394
Settlement Date	Oct. 28, 2022
Net Amount of Derivative Assets	$ 36
Open Forward Foreign Currency Contract, Identifier [Axis]: Forward Currency Contracts Morgan Stanley GBP Settlement Date 102822
Schedule of Investments [Line Items]
Counterparty	Morgan Stanley		Morgan Stanley	Morgan Stanley	Morgan Stanley
Currency to be sold | £				£ 282
Currency to be purchased	$ 340
Settlement Date	Oct. 28, 2022
Net Amount of Derivative Assets	$ 25
Open Forward Foreign Currency Contract, Identifier [Axis]: Forward Currency Contracts, Morgan Stanley, CAD, Settlement Date 1/27/22
Schedule of Investments [Line Items]
Counterparty		Morgan Stanley				Morgan Stanley	Morgan Stanley
Currency to be sold						$ 856
Currency to be purchased		$ 692
Settlement Date		Jan. 27, 2022
Net Amount of Derivative Assets		$ 15
Open Forward Foreign Currency Contract, Identifier [Axis]: Forward Currency Contracts, Morgan Stanley, CAD, Settlement Date 7/29/22
Schedule of Investments [Line Items]
Currency to be sold			$ 348
Currency to be purchased	270
Open Forward Foreign Currency Contract, Identifier [Axis]: Forward Currency Contracts, Morgan Stanley, GBP, Settlement Date 1/27/22
Schedule of Investments [Line Items]
Counterparty		Morgan Stanley				Morgan Stanley	Morgan Stanley
Currency to be sold | £							£ 175
Currency to be purchased		$ 241
Settlement Date		Jan. 27, 2022
Net Amount of Derivative Assets		$ 4
Open Forward Foreign Currency Contract, Identifier [Axis]: Forward Currency Contracts, Morgan Stanley, GBP, Settlement Date 7/29/22
Schedule of Investments [Line Items]
Currency to be sold | £				£ 282
Currency to be purchased	340
STRS JV
Schedule of Investments [Line Items]
Net Amount of Derivative Assets	$ 79	$ 19

INVESTMENTS - Superscript (Deta

INVESTMENTS - Superscript (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2022	Dec. 31, 2021
Schedule of Investments [Line Items]
STRS JV's portfolio company investments as a percentage of members' equity	222.86%	234.24%
STRS JV's portfolio company investments as a percentage of total assets	92%	95%
PIK interest rate		1.50%
One-month LIBOR		0.10%
Three-month LIBOR		0.21%
Six-month LIBOR		0.34%
One-month GBP LIBOR		0.19%
Three-month GBP LIBOR		0.26%
Six-month GBP LIBOR		0.47%
Three-month Euro EurIBOR		(0.57%)
CDOR		0.52%
Prime		3.25%
STRS JV
Schedule of Investments [Line Items]
STRS JV's portfolio company investments as a percentage of members' equity	849%	998%
PIK interest rate		7%
Outstanding commitments to fund investments	$ 28,762	$ 22,883
Investments on non-accrual	$ 0	$ 0

INVESTMENTS - Selected Balance

INVESTMENTS - Selected Balance Sheet Information For STRS JV (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021	Sep. 30, 2021
Assets
Investments	$ 764,554	$ 819,208
Cash and cash equivalents	9,855	12,185	$ 9,579
Unrealized appreciation on foreign currency forward contracts	10
Total assets	796,658	851,019
Liabilities
Credit facility	430,992	475,958
Interest payable on credit facility	3,772	2,087
Total liabilities	453,639	501,268
Total liabilities and total net assets	796,658	851,019
Investments, amortized cost	$ 773,406	$ 831,960
Derivative Asset Type	Foreign currency forward contracts	Foreign currency forward contracts
STRS JV
Assets
Investments	$ 280,877	$ 259,510
Cash and cash equivalents	23,715	13,004
Interest receivable	1,433	735
Unrealized appreciation on foreign currency forward contracts	79	19
Other assets	288	255
Total assets	306,392	273,523
Liabilities
Credit facility	149,322	145,003
Note payable to members	120,000	100,000
Interest payable on credit facility	576	282
Interest payable on notes to members	2,630	1,575
Other liabilities	764	651
Total liabilities	273,292	247,511
Members' equity	33,100	26,012
Total liabilities and total net assets	306,392	273,523
Investments, amortized cost	$ 285,614	$ 260,472

INVESTMENTS - Selected Statemen

INVESTMENTS - Selected Statement of Operations Information For STRS JV (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Schedule of Investments [Line Items]
Total investment income	$ 21,558	$ 18,378	$ 61,592	$ 53,689
Administrative service fees	171	171	512	512
Total expenses	11,595	10,486	34,814	31,508
Net investment income after excise tax	9,768	7,639	26,184	21,336
Net increase in net assets resulting from operations	3,845	8,275	16,901	26,951
STRS JV
Schedule of Investments [Line Items]
Interest income	7,858	4,972	20,985	13,554
Total investment income	7,858	4,972	20,985	13,554
Interest expense on credit facility	2,034	1,079	4,919	3,037
Interest expense on notes to members	2,630	1,511	6,611	3,937
Administrative service fees	161	117	475	312
Other expenses	128	150	513	379
Total expenses	4,953	2,857	12,518	7,665
Net investment income after excise tax	2,905	2,115	8,467	5,889
Net realized gains (losses) on investments and foreign currency transactions	130	8	250	(51)
Net change in unrealized appreciation (depreciation) on investments and foreign currency transactions	(286)	874	1,306	1,209
Net increase in net assets resulting from operations	$ 2,749	$ 2,997	$ 10,023	$ 7,047

FAIR VALUE MEASUREMENTS (Detail

FAIR VALUE MEASUREMENTS (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
FAIR VALUE MEASUREMENTS
Investments	$ 764,554	$ 819,208
First lien secured loans
FAIR VALUE MEASUREMENTS
Investments	615,945	697,232
Second lien secured loans
FAIR VALUE MEASUREMENTS
Investments	20,383	23,650
Subordinated unsecured loans
FAIR VALUE MEASUREMENTS
Investments	167
Subordinated Note to STRS JV
FAIR VALUE MEASUREMENTS
Investments	80,000	167
Subordinated Note to STRS JV
FAIR VALUE MEASUREMENTS
Investments		60,000
Equity (excluding STRS JV)
FAIR VALUE MEASUREMENTS
Investments	25,993	22,552
Equity in STRS JV
FAIR VALUE MEASUREMENTS
Investments	22,066	15,607
Level 2 | Foreign currency forward contracts
FAIR VALUE MEASUREMENTS
Investments	10
Level 3
FAIR VALUE MEASUREMENTS
Investments	742,488	803,601
Level 3 | First lien secured loans
FAIR VALUE MEASUREMENTS
Investments	615,945	697,232
Level 3 | Second lien secured loans
FAIR VALUE MEASUREMENTS
Investments	20,383	23,650
Level 3 | Subordinated unsecured loans
FAIR VALUE MEASUREMENTS
Investments	167
Level 3 | Subordinated Note to STRS JV
FAIR VALUE MEASUREMENTS
Investments	80,000	167
Level 3 | Subordinated Note to STRS JV
FAIR VALUE MEASUREMENTS
Investments		60,000
Level 3 | Equity (excluding STRS JV)
FAIR VALUE MEASUREMENTS
Investments	$ 25,993	$ 22,552

FAIR VALUE MEASUREMENTS - Level

FAIR VALUE MEASUREMENTS - Level 3 Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Fair value measurements
Fair value, beginning of period	$ 744,200	$ 658,393	$ 803,601	$ 680,568
Funding of investments	53,301	145,430	243,752	344,959
Non-cash interest income	597	174	1,553	860
Accretion of discount	1,060	2,144	4,036	5,649
Proceeds from paydowns and sales	(49,560)	(133,361)	(296,797)	(363,620)
Realized gains (losses)	199	109	(16,099)	7,714
Net unrealized (depreciation) appreciation	(7,309)	(579)	2,442	(3,820)
Fair value, end of period	742,488	672,310	742,488	672,310
Change in unrealized appreciation (depreciation) on investments still held	(6,775)	3,259	(10,627)	4,840
First lien secured loans
Fair value measurements
Fair value, beginning of period	614,859	562,837	697,232	588,580
Funding of investments	52,893	135,497	222,667	310,749
Non-cash interest income	594	173	1,548	857
Accretion of discount	1,039	2,115	3,972	5,549
Proceeds from paydowns and sales	(48,549)	(133,361)	(293,935)	(341,177)
Conversions			(4,060)
Realized gains (losses)	45	120	(16,994)	8,288
Net unrealized (depreciation) appreciation	(4,936)	(2,385)	5,515	(7,850)
Fair value, end of period	615,945	564,996	615,945	564,996
Change in unrealized appreciation (depreciation) on investments still held	(4,689)	216	(6,691)	1,516
Second lien secured loans
Fair value measurements
Fair value, beginning of period	22,063	29,714	23,650	27,596
Funding of investments				14,550
Non-cash interest income	3	1	5	3
Accretion of discount	21	29	64	125
Proceeds from paydowns and sales				(12,670)
Realized gains (losses)			(1,024)
Net unrealized (depreciation) appreciation	(1,704)	(82)	(2,312)	58
Fair value, end of period	20,383	29,662	20,383	29,662
Change in unrealized appreciation (depreciation) on investments still held	(1,702)	112	(3,336)	113
Subordinated Notes
Fair value measurements
Fair value, beginning of period	167		167
Funding of investments		167		498
Proceeds from paydowns and sales				(331)
Fair value, end of period	167	167	167	167
Subordinated Note to STRS JV
Fair value measurements
Fair value, beginning of period	80,000	49,809	60,000	41,073
Funding of investments		7,488	20,000	16,224
Fair value, end of period	80,000	57,297	80,000	57,297
Equity (excluding STRS JV)
Fair value measurements
Fair value, beginning of period	27,111	16,033	22,552	23,319
Funding of investments	408	2,278	1,085	2,938
Accretion of discount				(25)
Proceeds from paydowns and sales	(1,011)		(2,862)	(9,442)
Conversions			4,060
Realized gains (losses)	154	(11)	1,919	(574)
Net unrealized (depreciation) appreciation	(669)	1,888	(761)	3,972
Fair value, end of period	25,993	20,188	25,993	20,188
Change in unrealized appreciation (depreciation) on investments still held	$ (384)	$ 2,931	$ (600)	$ 3,211

FAIR VALUE MEASUREMENTS - Quant

FAIR VALUE MEASUREMENTS - Quantitative information (Details) $ in Thousands	Sep. 30, 2022 USD ($) $ / shares	Dec. 31, 2021 USD ($) $ / shares
FAIR VALUE MEASUREMENTS
Investments	$ 764,554	$ 819,208
Discount for lack of marketability
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input	0.150
First lien secured loans
FAIR VALUE MEASUREMENTS
Investments	$ 615,945	697,232
Second lien secured loans
FAIR VALUE MEASUREMENTS
Investments	20,383	23,650
Subordinated Notes
FAIR VALUE MEASUREMENTS
Investments	167	167
Level 3
FAIR VALUE MEASUREMENTS
Investments	$ 742,488	803,601
Level 3 | Discounted cash flows and Enterprise value | EBITDA Multiple Range | Weighted average
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input	0.093
Level 3 | First lien secured loans
FAIR VALUE MEASUREMENTS
Investments	$ 615,945	697,232
Level 3 | First lien secured loans | Discounted cash flows
FAIR VALUE MEASUREMENTS
Investments	$ 406,569	$ 358,921
Level 3 | First lien secured loans | Discounted cash flows | Discount rate | Minimum
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input	0.075	0.045
Level 3 | First lien secured loans | Discounted cash flows | Discount rate | Maximum
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input	0.199	0.218
Level 3 | First lien secured loans | Discounted cash flows | Discount rate | Weighted average
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input	0.124	0.098
Level 3 | First lien secured loans | Discounted cash flows | Exit EBITDA Multiple | Minimum
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input		0.055
Level 3 | First lien secured loans | Discounted cash flows | Exit EBITDA Multiple | Maximum
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input		0.150
Level 3 | First lien secured loans | Discounted cash flows | Exit EBITDA Multiple | Weighted average
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input		0.083
Level 3 | First lien secured loans | Recent transaction
FAIR VALUE MEASUREMENTS
Investments	$ 37,014
Level 3 | First lien secured loans | Recent transaction | Transaction price
FAIR VALUE MEASUREMENTS
Investments		$ 209,892
Level 3 | First lien secured loans | Recent transaction | Transaction price | Minimum
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input	0.820	0.945
Level 3 | First lien secured loans | Recent transaction | Transaction price | Maximum
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input	0.991	0.991
Level 3 | First lien secured loans | Recent transaction | Transaction price | Weighted average
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input	(0.918)	0.979
Level 3 | First lien secured loans | Discounted cash flows and Recent transaction
FAIR VALUE MEASUREMENTS
Investments	$ 111,055	$ 113,808
Level 3 | First lien secured loans | Discounted cash flows and Recent transaction | Discount rate | Minimum
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input	0.076	0.072
Level 3 | First lien secured loans | Discounted cash flows and Recent transaction | Discount rate | Maximum
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input	0.135	0.103
Level 3 | First lien secured loans | Discounted cash flows and Recent transaction | Discount rate | Weighted average
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input	0.126	0.086
Level 3 | First lien secured loans | Discounted cash flows and Recent transaction | Transaction price | Minimum
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input	0.924	0.975
Level 3 | First lien secured loans | Discounted cash flows and Recent transaction | Transaction price | Maximum
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input	1	0.988
Level 3 | First lien secured loans | Discounted cash flows and Recent transaction | Transaction price | Weighted average
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input	(0.979)	0.984
Level 3 | First lien secured loans | Discounted cash flows and Recent transaction | Exit EBITDA Multiple
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input		0.095
Level 3 | First lien secured loans | Discounted cash flows and Recent transaction | Exit EBITDA Multiple | Minimum
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input		0.070
Level 3 | First lien secured loans | Discounted cash flows and Recent transaction | Exit EBITDA Multiple | Maximum
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input		0.110
Level 3 | First lien secured loans | Guideline public companies
FAIR VALUE MEASUREMENTS
Investments		$ 7,542
Level 3 | First lien secured loans | Guideline public companies | EBITDA Multiple Range
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input		0.051
Level 3 | First lien secured loans | Discounted cash flows and Market quote
FAIR VALUE MEASUREMENTS
Investments	$ 30,790
Level 3 | First lien secured loans | Discounted cash flows and Market quote | Discount rate | Minimum
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input	0.105
Level 3 | First lien secured loans | Discounted cash flows and Market quote | Discount rate | Maximum
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input	0.118
Level 3 | First lien secured loans | Discounted cash flows and Market quote | Discount rate | Weighted average
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input	0.114
Level 3 | First lien secured loans | Discounted cash flows and Market quote | Market Quote
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input	1
Level 3 | First lien secured loans | Discounted cash flows and Market quote | Market Quote | Minimum
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input	0.852
Level 3 | First lien secured loans | Discounted cash flows and Market quote | Market Quote | Maximum
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input	0.951
Level 3 | First lien secured loans | Discounted cash flows and Market quote | Market Quote | Weighted average
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input	(0.907)
Level 3 | First lien secured loans | Expected repayment
FAIR VALUE MEASUREMENTS
Investments	$ 30,517	$ 7,069
Level 3 | Second lien secured loans
FAIR VALUE MEASUREMENTS
Investments	20,383	23,650
Level 3 | Second lien secured loans | Discounted cash flows
FAIR VALUE MEASUREMENTS
Investments	$ 3,274	$ 18,725
Level 3 | Second lien secured loans | Discounted cash flows | Discount rate
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input	0.174
Level 3 | Second lien secured loans | Discounted cash flows | Discount rate | Minimum
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input		0.115
Level 3 | Second lien secured loans | Discounted cash flows | Discount rate | Maximum
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input		0.223
Level 3 | Second lien secured loans | Discounted cash flows | Discount rate | Weighted average
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input		0.142
Level 3 | Second lien secured loans | Discounted cash flows | Exit EBITDA Multiple | Minimum
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input		0.065
Level 3 | Second lien secured loans | Discounted cash flows | Exit EBITDA Multiple | Maximum
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input		0.085
Level 3 | Second lien secured loans | Discounted cash flows | Exit EBITDA Multiple | Weighted average
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input		0.080
Level 3 | Second lien secured loans | Recent transaction
FAIR VALUE MEASUREMENTS
Investments		$ 4,925
Level 3 | Second lien secured loans | Recent transaction | Transaction price
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input		0.985
Level 3 | Second lien secured loans | Discounted cash flows and Recent transaction
FAIR VALUE MEASUREMENTS
Investments	$ 4,912
Level 3 | Second lien secured loans | Discounted cash flows and Recent transaction | Discount rate
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input	0.122
Level 3 | Second lien secured loans | Discounted cash flows and Recent transaction | Transaction price
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input	0.986
Level 3 | Second lien secured loans | Discounted cash flows and Market quote
FAIR VALUE MEASUREMENTS
Investments	$ 12,197
Level 3 | Second lien secured loans | Discounted cash flows and Market quote | Discount rate
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input	0.182
Level 3 | Second lien secured loans | Discounted cash flows and Market quote | Market Quote
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input	0.778
Level 3 | Subordinated Notes
FAIR VALUE MEASUREMENTS
Investments	$ 80,167	$ 60,167
Level 3 | Subordinated Notes | Recent transaction
FAIR VALUE MEASUREMENTS
Investments		$ 167
Level 3 | Subordinated Notes | Recent transaction | Transaction price
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input		1
Level 3 | Subordinated Notes | Enterprise value
FAIR VALUE MEASUREMENTS
Investments	80,000	$ 60,000
Level 3 | Subordinated Notes | Discounted cash flows and Enterprise value
FAIR VALUE MEASUREMENTS
Investments	$ 167
Level 3 | Subordinated Notes | Discounted cash flows and Enterprise value | Discount rate
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input	0.041
Level 3 | Preferred Equity
FAIR VALUE MEASUREMENTS
Investments	$ 3,886	2,811
Level 3 | Preferred Equity | Discounted cash flows
FAIR VALUE MEASUREMENTS
Investments	$ 2,217
Level 3 | Preferred Equity | Discounted cash flows | Discount rate | Minimum
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input	0.243
Level 3 | Preferred Equity | Discounted cash flows | Discount rate | Maximum
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input	0.255
Level 3 | Preferred Equity | Discounted cash flows | Discount rate | Weighted average
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input	0.244
Level 3 | Preferred Equity | Discounted cash flows | EBITDA Multiple Range
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input	0.090
Level 3 | Preferred Equity | Recent transaction | Transaction price
FAIR VALUE MEASUREMENTS
Investments		$ 1,007
Level 3 | Preferred Equity | Recent transaction | Transaction price | Minimum
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input | $ / shares		1
Level 3 | Preferred Equity | Recent transaction | Transaction price | Maximum
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input | $ / shares		56.30
Level 3 | Preferred Equity | Recent transaction | Transaction price | Weighted average
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input | $ / shares		47.13
Level 3 | Preferred Equity | Recent transaction | Discount for lack of marketability
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input		0.150
Level 3 | Preferred Equity | Similar Transaction
FAIR VALUE MEASUREMENTS
Investments		$ 1,018
Level 3 | Preferred Equity | Similar Transaction | EBITDA Multiple Range
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input		0.097
Level 3 | Preferred Equity | Discounted Cash Flows and Guideline Public Companies
FAIR VALUE MEASUREMENTS
Investments		$ 786
Level 3 | Preferred Equity | Discounted Cash Flows and Guideline Public Companies | Discount rate
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input		0.173
Level 3 | Preferred Equity | Discounted Cash Flows and Guideline Public Companies | Exit EBITDA Multiple
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input		0.110
Level 3 | Preferred Equity | Discounted Cash Flows and Guideline Public Companies | EBITDA Multiple Range
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input		0.079
Level 3 | Preferred Equity | Discounted Cash Flows and Guideline Public Companies | NFY EBITDA Multiple
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input		0.075
Level 3 | Preferred Equity | Discounted Cash Flows and Guideline Public Companies | Discount for lack of marketability
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input		0.100
Level 3 | Preferred Equity | Enterprise value
FAIR VALUE MEASUREMENTS
Investments	$ 853
Level 3 | Preferred Equity | Enterprise value | Discount rate
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input	0.117
Level 3 | Preferred Equity | Discounted cash flows and Enterprise value
FAIR VALUE MEASUREMENTS
Investments	$ 816
Level 3 | Preferred Equity | Discounted cash flows and Enterprise value | Discount rate
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input	0.170
Level 3 | Preferred Equity | Discounted cash flows and Enterprise value | EBITDA Multiple Range | Minimum
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input	0.036
Level 3 | Preferred Equity | Discounted cash flows and Enterprise value | EBITDA Multiple Range | Maximum
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input	0.085
Level 3 | Preferred Equity | Discounted cash flows and Enterprise value | EBITDA Multiple Range | Weighted average
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input	0.061
Level 3 | Preferred Equity | Discounted cash flows and Enterprise value | Discount for lack of marketability
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input	0.150
Level 3 | Common Equity
FAIR VALUE MEASUREMENTS
Investments	$ 15,852	$ 15,280
Level 3 | Common Equity | Discounted cash flows
FAIR VALUE MEASUREMENTS
Investments	$ 1,614	$ 3,602
Level 3 | Common Equity | Discounted cash flows | Discount rate | Minimum
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input	0.193	0.130
Level 3 | Common Equity | Discounted cash flows | Discount rate | Maximum
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input	0.213	0.227
Level 3 | Common Equity | Discounted cash flows | Discount rate | Weighted average
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input	0.211	0.150
Level 3 | Common Equity | Discounted cash flows | Exit EBITDA Multiple | Minimum
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input		0.086
Level 3 | Common Equity | Discounted cash flows | Exit EBITDA Multiple | Maximum
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input		0.100
Level 3 | Common Equity | Discounted cash flows | Exit EBITDA Multiple | Weighted average
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input		0.096
Level 3 | Common Equity | Discounted cash flows | EBITDA Multiple Range
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input	0.075
Level 3 | Common Equity | Discounted cash flows | Discount for lack of marketability | Minimum
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input		0.100
Level 3 | Common Equity | Discounted cash flows | Discount for lack of marketability | Maximum
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input		0.150
Level 3 | Common Equity | Discounted cash flows | Discount for lack of marketability | Weighted average
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input		0.103
Level 3 | Common Equity | Recent transaction
FAIR VALUE MEASUREMENTS
Investments	$ 400
Level 3 | Common Equity | Recent transaction | Transaction price
FAIR VALUE MEASUREMENTS
Investments		$ 1,502
Investments Owned, Measurement Input | $ / shares	1
Level 3 | Common Equity | Recent transaction | Transaction price | Minimum
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input | $ / shares		1
Level 3 | Common Equity | Recent transaction | Transaction price | Maximum
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input | $ / shares		1,000
Level 3 | Common Equity | Recent transaction | Transaction price | Weighted average
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input | $ / shares		289.95
Level 3 | Common Equity | Recent transaction | Discount for lack of marketability
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input	0.150
Level 3 | Common Equity | Similar Transaction | EBITDA Multiple Range
FAIR VALUE MEASUREMENTS
Investments		$ 2,052
Level 3 | Common Equity | Similar Transaction | EBITDA Multiple Range | Minimum
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input		0.060
Level 3 | Common Equity | Similar Transaction | EBITDA Multiple Range | Maximum
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input		0.134
Level 3 | Common Equity | Similar Transaction | EBITDA Multiple Range | Weighted average
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input		0.105
Level 3 | Common Equity | Discounted Cash Flows, Guideline Public Companies and Expected Repayment
FAIR VALUE MEASUREMENTS
Investments		$ 8,124
Level 3 | Common Equity | Discounted Cash Flows, Guideline Public Companies and Expected Repayment | Discount rate | Minimum
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input		0.140
Level 3 | Common Equity | Discounted Cash Flows, Guideline Public Companies and Expected Repayment | Discount rate | Maximum
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input		0.190
Level 3 | Common Equity | Discounted Cash Flows, Guideline Public Companies and Expected Repayment | Discount rate | Weighted average
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input		0.182
Level 3 | Common Equity | Discounted Cash Flows, Guideline Public Companies and Expected Repayment | Transaction price
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input | $ / shares		1
Level 3 | Common Equity | Discounted Cash Flows, Guideline Public Companies and Expected Repayment | Exit EBITDA Multiple | Minimum
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input		0.080
Level 3 | Common Equity | Discounted Cash Flows, Guideline Public Companies and Expected Repayment | Exit EBITDA Multiple | Maximum
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input		0.110
Level 3 | Common Equity | Discounted Cash Flows, Guideline Public Companies and Expected Repayment | Exit EBITDA Multiple | Weighted average
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input		0.105
Level 3 | Common Equity | Discounted Cash Flows, Guideline Public Companies and Expected Repayment | NFY EBITDA Multiple | Minimum
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input		0.086
Level 3 | Common Equity | Discounted Cash Flows, Guideline Public Companies and Expected Repayment | NFY EBITDA Multiple | Maximum
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input		0.108
Level 3 | Common Equity | Discounted Cash Flows, Guideline Public Companies and Expected Repayment | NFY EBITDA Multiple | Weighted average
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input		0.089
Level 3 | Common Equity | Discounted Cash Flows, Guideline Public Companies and Expected Repayment | Discount for lack of marketability
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input		0.100
Level 3 | Common Equity | Enterprise value
FAIR VALUE MEASUREMENTS
Investments	$ 361
Level 3 | Common Equity | Enterprise value | EBITDA Multiple Range | Minimum
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input	0.133
Level 3 | Common Equity | Enterprise value | EBITDA Multiple Range | Maximum
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input	0.171
Level 3 | Common Equity | Enterprise value | Discount for lack of marketability
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input	0.100
Level 3 | Common Equity | Discounted cash flows and Enterprise value
FAIR VALUE MEASUREMENTS
Investments	$ 9,523
Level 3 | Common Equity | Discounted cash flows and Enterprise value | Discount rate | Minimum
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input	0.120
Level 3 | Common Equity | Discounted cash flows and Enterprise value | Discount rate | Maximum
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input	0.194
Level 3 | Common Equity | Discounted cash flows and Enterprise value | Discount rate | Weighted average
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input	0.181
Level 3 | Common Equity | Discounted cash flows and Enterprise value | EBITDA Multiple Range | Minimum
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input	0.048
Level 3 | Common Equity | Discounted cash flows and Enterprise value | EBITDA Multiple Range | Maximum
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input	0.121
Level 3 | Common Equity | Collateral value and Recent transaction
FAIR VALUE MEASUREMENTS
Investments	$ 219
Level 3 | Common Equity | Collateral value and Recent transaction | Transaction price
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input | $ / shares	1.30
Level 3 | Common Equity | Collateral value and Recent transaction | EBITDA Multiple Range
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input	0.080
Level 3 | Common Equity | Collateral value and Recent transaction | Discount for lack of marketability
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input	0.150
Level 3 | Common Equity | Collateral value
FAIR VALUE MEASUREMENTS
Investments	$ 2,471
Level 3 | Common Equity | Collateral value | EBITDA Multiple Range | Minimum
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input	0.060
Level 3 | Common Equity | Collateral value | EBITDA Multiple Range | Maximum
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input	0.100
Level 3 | Common Equity | Collateral value | EBITDA Multiple Range | Weighted average
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input	0.080
Level 3 | Common Equity | Recent transaction and Enterprise Value
FAIR VALUE MEASUREMENTS
Investments	$ 1,264
Level 3 | Common Equity | Recent transaction and Enterprise Value | Minimum
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input | $ / shares	10
Level 3 | Common Equity | Recent transaction and Enterprise Value | Maximum
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input | $ / shares	1,000
Level 3 | Common Equity | Recent transaction and Enterprise Value | Weighted average
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input | $ / shares	482.4
Level 3 | Common Equity | Recent transaction and Enterprise Value | EBITDA Multiple Range | Minimum
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input	0.050
Level 3 | Common Equity | Recent transaction and Enterprise Value | EBITDA Multiple Range | Maximum
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input	0.123
Level 3 | Common Equity | Recent transaction and Enterprise Value | EBITDA Multiple Range | Weighted average
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input	0.088
Level 3 | Warrant
FAIR VALUE MEASUREMENTS
Investments	$ 6,255	$ 4,461
Level 3 | Warrant | Discounted cash flows
FAIR VALUE MEASUREMENTS
Investments	$ 2,432
Level 3 | Warrant | Discounted cash flows | Discount rate
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input	0.005
Level 3 | Warrant | Discounted cash flows | EBITDA Multiple Range
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input	0.003
Level 3 | Warrant | Discounted cash flows | Discount for lack of marketability
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input	0.004
Level 3 | Warrant | Discounted cash flows | Volatility
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input	0
Level 3 | Warrant | Enterprise value | EBITDA Multiple Range | Weighted average
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input	0.152
Level 3 | Warrant | Discounted cash flows and Option-pricing method
FAIR VALUE MEASUREMENTS
Investments	$ 3,823	$ 4,461
Level 3 | Warrant | Discounted cash flows and Option-pricing method | Discount rate
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input	0.193
Level 3 | Warrant | Discounted cash flows and Option-pricing method | Discount rate | Minimum
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input		0.227
Level 3 | Warrant | Discounted cash flows and Option-pricing method | Discount rate | Maximum
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input		0.295
Level 3 | Warrant | Discounted cash flows and Option-pricing method | Discount rate | Weighted average
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input		0.292
Level 3 | Warrant | Discounted cash flows and Option-pricing method | Exit EBITDA Multiple | Minimum
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input		0.055
Level 3 | Warrant | Discounted cash flows and Option-pricing method | Exit EBITDA Multiple | Maximum
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input		0.086
Level 3 | Warrant | Discounted cash flows and Option-pricing method | Exit EBITDA Multiple | Weighted average
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input		0.059
Level 3 | Warrant | Discounted cash flows and Option-pricing method | EBITDA Multiple Range
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input	0.102
Level 3 | Warrant | Discounted cash flows and Option-pricing method | Discount for lack of marketability
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input	0.150	0.150
Level 3 | Warrant | Discounted cash flows and Option-pricing method | Volatility | Minimum
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input		0.035
Level 3 | Warrant | Discounted cash flows and Option-pricing method | Volatility | Maximum
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input		0.087
Level 3 | Warrant | Discounted cash flows and Option-pricing method | Volatility | Weighted average
FAIR VALUE MEASUREMENTS
Investments Owned, Measurement Input		0.036

FAIR VALUE MEASUREMENTS - Borro

FAIR VALUE MEASUREMENTS - Borrowings (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021	Dec. 06, 2021	Nov. 24, 2021	Dec. 04, 2020	Oct. 20, 2020	Jul. 13, 2018
FAIR VALUE MEASUREMENTS
Principal Amount Outstanding	$ 436,101	$ 481,637
Fair Value, Debt	$ 417,613	$ 494,642
6.000% 2023 Notes
FAIR VALUE MEASUREMENTS
Interest rate (as a percent)	6%	6%		6%			6%
5.375% 2025 Notes
FAIR VALUE MEASUREMENTS
Interest rate (as a percent)	5.375%	5.375%		5.375%		5.375%
5.375% 2026 Notes
FAIR VALUE MEASUREMENTS
Interest rate (as a percent)	5.375%	5.375%		5.375%	5.375%
4.000% 2026 Notes
FAIR VALUE MEASUREMENTS
Interest rate (as a percent)	4%	4%		4%
5.625% 2027 Notes
FAIR VALUE MEASUREMENTS
Interest rate (as a percent)	5.625%	5.625%		5.625%	5.625%
4.250% 2028 Notes
FAIR VALUE MEASUREMENTS
Interest rate (as a percent)	4.25%	4.25%	4.25%	4.25%
Level 3 | JPM Credit Facility
FAIR VALUE MEASUREMENTS
Principal Amount Outstanding	$ 246,101	$ 291,637
Fair Value, Debt	243,552	302,147
Level 3 | 6.000% 2023 Notes
FAIR VALUE MEASUREMENTS
Principal Amount Outstanding	30,000	30,000
Fair Value, Debt	29,860	31,802
Level 3 | 5.375% 2025 Notes
FAIR VALUE MEASUREMENTS
Principal Amount Outstanding	40,000	40,000
Fair Value, Debt	37,355	40,687
Level 3 | 5.375% 2026 Notes
FAIR VALUE MEASUREMENTS
Principal Amount Outstanding	10,000	10,000
Fair Value, Debt	9,089	10,091
Level 3 | 4.000% 2026 Notes
FAIR VALUE MEASUREMENTS
Principal Amount Outstanding	75,000	75,000
Fair Value, Debt	67,132	74,957
Level 3 | 5.625% 2027 Notes
FAIR VALUE MEASUREMENTS
Principal Amount Outstanding	10,000	10,000
Fair Value, Debt	8,983	10,097
Level 3 | 4.250% 2028 Notes
FAIR VALUE MEASUREMENTS
Principal Amount Outstanding	25,000	25,000
Fair Value, Debt	$ 21,642	$ 24,861

BORROWINGS - Outstanding and Av

BORROWINGS - Outstanding and Available (Details) - USD ($) $ in Thousands			9 Months Ended	12 Months Ended
	Feb. 04, 2022	Jul. 15, 2021	Sep. 30, 2022	Dec. 31, 2021	Mar. 30, 2022	Mar. 29, 2022	Feb. 03, 2022	Dec. 06, 2021	Nov. 24, 2021	Dec. 04, 2020	Oct. 20, 2020	Jul. 13, 2018
Debt Instrument [Line Items]
Principal Amount Outstanding			$ 436,101	$ 481,637
Amortized Cost, credit facility			430,992	475,958
Available			88,899	43,363
Amortized Cost, Notes			430,992	475,958
JPM Credit Facility
Debt Instrument [Line Items]
Principal Amount Outstanding			246,101	291,637
Amortized Cost, credit facility			243,552	288,985
Available	$ 310,000		$ 88,899	$ 43,363	$ 335,000	$ 310,000	$ 285,000
Variable interest rate (as a percent)	2.50%	2.35%
JPM Credit Facility | Libor
Debt Instrument [Line Items]
Variable interest rate (as a percent)			2.35%	2.35%
6.000% 2023 Notes
Debt Instrument [Line Items]
Principal Amount Outstanding			$ 30,000	$ 30,000								$ 30,000
Amortized Cost, credit facility			$ 29,849	$ 29,717
Variable interest rate (as a percent)			6%	6%
Interest rate (as a percent)			6%	6%					6%			6%
5.375% 2025 Notes
Debt Instrument [Line Items]
Principal Amount Outstanding			$ 40,000	$ 40,000							$ 40,000
Amortized Cost, credit facility			$ 39,596	$ 39,497
Variable interest rate (as a percent)			5.375%	5.375%
Interest rate (as a percent)			5.375%	5.375%					5.375%		5.375%
5.375% 2026 Notes
Debt Instrument [Line Items]
Principal Amount Outstanding			$ 10,000	$ 10,000						$ 10,000
Amortized Cost, credit facility			$ 9,878	$ 9,856
Variable interest rate (as a percent)			5.375%	5.375%
Interest rate (as a percent)			5.375%	5.375%					5.375%	5.375%
4.000% 2026 Notes
Debt Instrument [Line Items]
Principal Amount Outstanding			$ 75,000	$ 75,000					$ 75,000
Amortized Cost, credit facility			$ 73,567	$ 73,404
Variable interest rate (as a percent)			4%	4%
Interest rate (as a percent)			4%	4%					4%
5.625% 2027 Notes
Debt Instrument [Line Items]
Principal Amount Outstanding			$ 10,000	$ 10,000						$ 10,000
Amortized Cost, credit facility			$ 9,870	$ 9,851
Variable interest rate (as a percent)			5.625%	5.625%
Interest rate (as a percent)			5.625%	5.625%					5.625%	5.625%
4.250% 2028 Notes
Debt Instrument [Line Items]
Principal Amount Outstanding			$ 25,000	$ 25,000				$ 25,000
Amortized Cost, credit facility			$ 24,680	$ 24,648
Variable interest rate (as a percent)			4.25%	4.25%
Interest rate (as a percent)			4.25%	4.25%				4.25%	4.25%

BORROWINGS - Narratives (Detail

BORROWINGS - Narratives (Details) $ in Thousands									3 Months Ended	9 Months Ended	12 Months Ended
	Feb. 04, 2022 USD ($)	Jan. 04, 2022 USD ($)	Oct. 04, 2021 USD ($)	Jul. 15, 2021	Dec. 21, 2020 USD ($)	Dec. 20, 2020 USD ($)	Aug. 02, 2018	Aug. 01, 2018	Sep. 30, 2022 USD ($)	Sep. 30, 2022 USD ($)	Dec. 31, 2021 USD ($)	Apr. 04, 2022 USD ($)	Mar. 30, 2022 USD ($)	Mar. 29, 2022 USD ($)	Feb. 03, 2022 USD ($)
Debt Instrument [Line Items]
Percentage of asset coverage for borrowed amounts										178.70%	172.60%
Available									$ 88,899	$ 88,899	$ 43,363
Principal Amount Outstanding									436,101	436,101	481,637
Principal Amount Outstanding									$ 436,101	$ 436,101	481,637
Minimum
Debt Instrument [Line Items]
Maximum debt-to-equity ratio									1	1
Debt outstanding for each dollar of equity										$ 1
Value of equity for Each Dollar of Debt										$ 1
Asset coverage ratio							150%
Maximum
Debt Instrument [Line Items]
Maximum debt-to-equity ratio									2	2
Debt outstanding for each dollar of equity										$ 1
Value of equity for Each Dollar of Debt										$ 2
Asset coverage ratio								200%
LIBOR | Minimum
Debt Instrument [Line Items]
Term of interest										3 years
LIBOR | Maximum
Debt Instrument [Line Items]
Term of interest										6 years
JPM Credit Facility
Debt Instrument [Line Items]
Increase in minimum funding of credit facility					$ 200,000	$ 175,000
Increase in credit facility size	$ 25,000				285,000	$ 250,000
Maximum borrowing limit									$ 285,000	$ 285,000		$ 335,000
Variable interest rate (as a percent)	2.50%			2.35%
Available	$ 310,000								88,899	$ 88,899	43,363		$ 335,000	$ 310,000	$ 285,000
Permanent increase in availability	25,000
Temporary Increase in line of credit facility	25,000	$ 335,000	$ 335,000
Commitment Fee (as a percent)										0.75%
Minimum borrowing capacity										$ 234,500
Minimum funding amount contingent	$ 217,000												234,500	$ 217,000	$ 200,000
Fair value of securities pledged as collateral									621,365	621,365
Principal Amount Outstanding									246,101	246,101	291,637
Amount undrawn under the credit facility									88,899	88,899	43,363
Weighted average outstanding borrowings									$ 245,920	$ 271,393	$ 245,934
Weighted average interest rate											2.60%
Effective interest rate (as a percent)									5.61%	5.61%	2.55%
Interest rate over time									4.48%	3.42%
JPM Credit Facility | Maximum
Debt Instrument [Line Items]
Maximum borrowing limit					$ 350,000								$ 375,000
JPM Credit Facility | LIBOR
Debt Instrument [Line Items]
Variable interest rate (as a percent)										2.35%
JPM Credit Facility | SOFR
Debt Instrument [Line Items]
Variable interest rate (as a percent)										2.50%

BORROWINGS - Notes (Details)

BORROWINGS - Notes (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021	Dec. 06, 2021	Nov. 24, 2021	Dec. 04, 2020	Oct. 20, 2020	Nov. 13, 2018	Jul. 13, 2018
Debt Instrument [Line Items]
Principal Amount Outstanding	$ 436,101	$ 481,637
6.000% 2023 Notes
Debt Instrument [Line Items]
Principal Amount Outstanding	$ 30,000	$ 30,000						$ 30,000
Interest rate (as a percent)	6%	6%		6%				6%
6.000% 2023 Notes | Maximum
Debt Instrument [Line Items]
Interest rate (as a percent)								6.50%
5.375% 2025 Notes
Debt Instrument [Line Items]
Principal Amount Outstanding	$ 40,000	$ 40,000				$ 40,000
Interest rate (as a percent)	5.375%	5.375%		5.375%		5.375%
5.375% 2025 Notes | Maximum
Debt Instrument [Line Items]
Interest rate (as a percent)						6.375%
5.375% 2026 Notes
Debt Instrument [Line Items]
Principal Amount Outstanding	$ 10,000	$ 10,000			$ 10,000
Interest rate (as a percent)	5.375%	5.375%		5.375%	5.375%
5.375% 2026 Notes | Maximum
Debt Instrument [Line Items]
Interest rate (as a percent)					6.375%
4.000% 2026 Notes
Debt Instrument [Line Items]
Principal Amount Outstanding	$ 75,000	$ 75,000		$ 75,000
Interest rate (as a percent)	4%	4%		4%
5.625% 2027 Notes
Debt Instrument [Line Items]
Principal Amount Outstanding	$ 10,000	$ 10,000			$ 10,000
Interest rate (as a percent)	5.625%	5.625%		5.625%	5.625%
5.625% 2027 Notes | Maximum
Debt Instrument [Line Items]
Interest rate (as a percent)					6.625%
4.250% 2028 Notes
Debt Instrument [Line Items]
Principal Amount Outstanding	$ 25,000	$ 25,000	$ 25,000
Interest rate (as a percent)	4.25%	4.25%	4.25%	4.25%
4.250% 2028 Notes | Maximum
Debt Instrument [Line Items]
Interest rate (as a percent)			5.25%
2025 Public Notes
Debt Instrument [Line Items]
Principal Amount Outstanding							$ 35,000
Interest rate (as a percent)							6.50%

RELATED PARTY TRANSACTIONS - (D

RELATED PARTY TRANSACTIONS - (Details) - Investment Advisory Agreement	9 Months Ended
	Sep. 30, 2022 item
Related Party Transaction [Line Items]
Agreement may be terminated by either party without penalty upon days	60 days
Percentage of base management fee on gross assets	2%
Percentage of base management fee on gross assets if value exceeded total assets	1.25%
Threshold percentage for calculation of base management fee	200%
Number of calendar quarters	2

RELATED PARTY TRANSACTIONS - Ba

RELATED PARTY TRANSACTIONS - Base management fee (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
RELATED PARTY TRANSACTIONS
Base management fee	$ 3,881	$ 3,508	$ 11,741	$ 10,209
Total management fees	3,881	$ 3,508	11,741	$ 10,209
Management fees payable	$ 3,881		$ 3,881		$ 3,766

RELATED PARTY TRANSACTIONS - Pe

RELATED PARTY TRANSACTIONS - Performance-based incentive fee (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($) component	Sep. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)
Related Party Transaction [Line Items]
Number of components | component			2
Incentive fee payables	$ 4,335		$ 4,335		$ 7,958
Total performance-based incentive fees	1,027	$ 2,069	4,291	$ 6,739
Income incentive fee	2,159	1,942	6,094	5,616
Capital gains incentive fee	(1,132)	127	(1,803)	1,123
Total performance-based incentive fees	1,027	$ 2,069	4,291	$ 6,739
Capital Gains Incentive Fees under GAAP
Related Party Transaction [Line Items]
Incentive fee payables	0		$ 0		$ 1,803
Investment adviser
Related Party Transaction [Line Items]
Number of components | component			2
Incentive fee payables	$ 0		$ 0

RELATED PARTY TRANSACTIONS - Ad

RELATED PARTY TRANSACTIONS - Administration , Coinvestment and STRS JV (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2022	Dec. 31, 2021	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Related Party Transaction [Line Items]
Administrative service fees	$ 171		$ 171	$ 512	$ 512
Net realized gains (losses)		$ 562		$ (15,537)	7,714
Administration Agreement
Related Party Transaction [Line Items]
Agreement may be terminated by either party without penalty upon days				60 days
Administrative service fees	171		171	$ 512	512
Administration Agreement | White Horse Advisers
Related Party Transaction [Line Items]
Affiliated funds invested	4,388,279	$ 4,502,807		4,388,279
Administration Agreement | STRS JV
Related Party Transaction [Line Items]
Proceeds from sale of investments	0		45,729	100,415	106,423
Net realized gains (losses)	$ 0		$ 120	$ 65	$ 277

COMMITMENTS AND CONTINGENCIES -

COMMITMENTS AND CONTINGENCIES - Unfunded commitments (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Unfunded commitments
Total Unfunded Commitments	$ 37,031	$ 53,113
Revolving Loan Commitments
Unfunded commitments
Total Unfunded Commitments	15,801	25,053
Revolving Loan Commitments | ABB/Con-cise Optical Group LLC (d/b/a ABB Optical Group, LLC)
Unfunded commitments
Total Unfunded Commitments	158
Revolving Loan Commitments | Bridgepoint Healthcare, LLC
Unfunded commitments
Total Unfunded Commitments	1,588	1,588
Revolving Loan Commitments | Camp Facility Services Holdings, LLC (d/b/a Camp Construction Services, Inc.)
Unfunded commitments
Total Unfunded Commitments		2,031
Revolving Loan Commitments | Claridge Products and Equipment, LLC
Unfunded commitments
Total Unfunded Commitments	56	491
Revolving Loan Commitments | Coastal Television Broadcasting Group LLC
Unfunded commitments
Total Unfunded Commitments	309	309
Revolving Loan Commitments | EducationDynamics, LLC
Unfunded commitments
Total Unfunded Commitments	960	1,199
Revolving Loan Commitments | Epiphany Business Services, LLC (d/b/a Epiphany Dermatology, PA)
Unfunded commitments
Total Unfunded Commitments		438
Revolving Loan Commitments | I&I Sales Group, LLC (d/b/a Avision Sales Group)
Unfunded commitments
Total Unfunded Commitments		619
Revolving Loan Commitments | HC Salon Holdings, Inc. (d/b/a Hair Cuttery)
Unfunded commitments
Total Unfunded Commitments	700	700
Revolving Loan Commitments | HRG Management, LLC (d/b/a HomeRiver Group, LLC)
Unfunded commitments
Total Unfunded Commitments		1,083
Revolving Loan Commitments | Industrial Specialty Services USA LLC
Unfunded commitments
Total Unfunded Commitments	295	1,182
Revolving Loan Commitments | Inspired Beauty Brands, Inc.
Unfunded commitments
Total Unfunded Commitments	531	531
Revolving Loan Commitments | ITS Buyer Inc. (d/b/a ITS Logistics, LLC)
Unfunded commitments
Total Unfunded Commitments		592
Revolving Loan Commitments | IvyRehab Intermediate II, LLC (d/b/a Ivy Rehab)
Unfunded commitments
Total Unfunded Commitments		403
Revolving Loan Commitments | Juniper Landscaping Holdings LLC
Unfunded commitments
Total Unfunded Commitments		597
Revolving Loan Commitments | LHS Borrower, LLC (d/b/a Leaf Home, LLC)
Unfunded commitments
Total Unfunded Commitments		560
Revolving Loan Commitments | LMG Holdings, Inc.
Unfunded commitments
Total Unfunded Commitments		414
Revolving Loan Commitments | Max Solutions Inc
Unfunded commitments
Total Unfunded Commitments	161
Revolving Loan Commitments | Max Solutions Inc.
Unfunded commitments
Total Unfunded Commitments	1,212
Revolving Loan Commitments | Motivational Marketing, LLC (d/b/a Motivational Fulfillment)
Unfunded commitments
Total Unfunded Commitments	1,182	1,182
Revolving Loan Commitments | MSI Information Services, Inc.
Unfunded commitments
Total Unfunded Commitments	750
Revolving Loan Commitments | Naviga Inc. (f/k/a Newscycle Solutions, Inc.)
Unfunded commitments
Total Unfunded Commitments	34	132
Revolving Loan Commitments | PFB Holdco, Inc. (d/b/a PFB Corporation)
Unfunded commitments
Total Unfunded Commitments	882	963
Revolving Loan Commitments | PFB Holdco, Inc. (d/b/a PFB Corporation)
Unfunded commitments
Total Unfunded Commitments	296	296
Revolving Loan Commitments | PG Dental New Jersey Parent, LLC
Unfunded commitments
Total Unfunded Commitments	352	232
Revolving Loan Commitments | PPS CR Acquisition, Inc. (d/b/a Power Plant Services)
Unfunded commitments
Total Unfunded Commitments	3,030	3,030
Revolving Loan Commitments | RLJ Pro-Vac, Inc. (d/b/a Pro-Vac)
Unfunded commitments
Total Unfunded Commitments		1,013
Revolving Loan Commitments | Sleep OpCo LLC (d/b/a Brooklyn Bedding LLC)
Unfunded commitments
Total Unfunded Commitments	2,646	2,646
Revolving Loan Commitments | Telestream Holdings Corporation
Unfunded commitments
Total Unfunded Commitments	397	795
Revolving Loan Commitments | The Kyjen Company, LLC (d/b/a Outward Hound)
Unfunded commitments
Total Unfunded Commitments	262	554
Revolving Loan Commitments | Trimlite Buyer LLC (d/b/a Trimlite LLC)
Unfunded commitments
Total Unfunded Commitments		1,473
Delayed Draw Loan Commitments
Unfunded commitments
Total Unfunded Commitments	21,230	28,060
Delayed Draw Loan Commitments | Bridgepoint Healthcare, LLC
Unfunded commitments
Total Unfunded Commitments	794	794
Delayed Draw Loan Commitments | Camp Facility Services Holdings, LLC (d/b/a Camp Construction Services, Inc.)
Unfunded commitments
Total Unfunded Commitments	4,063	4,063
Delayed Draw Loan Commitments | EducationDynamics, LLC
Unfunded commitments
Total Unfunded Commitments	1,709	1,709
Delayed Draw Loan Commitments | Empire Office, Inc.
Unfunded commitments
Total Unfunded Commitments		4,926
Delayed Draw Loan Commitments | I&I Sales Group, LLC (d/b/a Avision Sales Group)
Unfunded commitments
Total Unfunded Commitments		2,699
Delayed Draw Loan Commitments | HRG Management, LLC (d/b/a HomeRiver Group, LLC)
Unfunded commitments
Total Unfunded Commitments		1,514
Delayed Draw Loan Commitments | Grupo HIMA San Pablo, Inc.
Unfunded commitments
Total Unfunded Commitments		667
Delayed Draw Loan Commitments | IvyRehab Intermediate II, LLC (d/b/a Ivy Rehab)
Unfunded commitments
Total Unfunded Commitments		1,188
Delayed Draw Loan Commitments | Juniper Landscaping Holdings LLC
Unfunded commitments
Total Unfunded Commitments		2,387
Delayed Draw Loan Commitments | JZ Capital Partners Ltd.
Unfunded commitments
Total Unfunded Commitments	5,714
Delayed Draw Loan Commitments | Max Solutions Inc
Unfunded commitments
Total Unfunded Commitments	2,755
Delayed Draw Loan Commitments | PlayMonster LLC
Unfunded commitments
Total Unfunded Commitments		2,867
Delayed Draw Loan Commitments | Power Service Group CR Acquisition Inc
Unfunded commitments
Total Unfunded Commitments	2,090
Delayed Draw Loan Commitments | Solar Holdings Bidco Limited
Unfunded commitments
Total Unfunded Commitments	3,700
Delayed Draw Loan Commitments | Source Code Holdings, LLC (d/b/a Source Code Corporation)
Unfunded commitments
Total Unfunded Commitments		2,185
Delayed Draw Loan Commitments | Telestream Holdings Corporation
Unfunded commitments
Total Unfunded Commitments	346
Delayed Draw Loan Commitments | True Blue Car Wash, LLC
Unfunded commitments
Total Unfunded Commitments	$ 59	1,145
Delayed Draw Loan Commitments | BBQ Buyer, LLC (d/b/a BBQ Guys)
Unfunded commitments
Total Unfunded Commitments		854
Delayed Draw Loan Commitments | DCA Investment Holding, LLC (d/b/a Dental Care Alliance, LLC)
Unfunded commitments
Total Unfunded Commitments		$ 1,062

COMMITMENTS AND CONTINGENCIES_2

COMMITMENTS AND CONTINGENCIES - Additional information (Details) - STRS JV - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2022	Dec. 31, 2021
Unfunded commitments
Commitments to fund equity interests	$ 20,000	$ 15,000
Commitments to subordinated notes	$ 80,000	$ 60,000

STOCKHOLDERS' EQUITY - Addition

STOCKHOLDERS' EQUITY - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands				3 Months Ended					9 Months Ended
	Nov. 03, 2021	Oct. 25, 2021	Mar. 15, 2021	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Subsidiary, Sale of Stock [Line Items]
Aggregate offering amount				$ (72)	$ 197	$ 1,438	$ 1,894	$ 590
Shares sold in the program	2,182,300
Gross proceeds from common stock						$ 3,320			$ 1,225	$ 6,113
Net proceeds of commissions to sales agent									$ 125	$ 3,922
Offering price						$ 15.22			$ 11.10	$ 15.22
ATM Program
Subsidiary, Sale of Stock [Line Items]
Shares sold in the program			276,360
Weighted-average price			$ 15.77
Gross proceeds from common stock			$ 4,359
Net proceeds of commissions to sales agent			4,272
Shares available under the program									$ 30,641		$ 30,893
ATM Program | Raymond James & Associates, Inc. | Maximum
Subsidiary, Sale of Stock [Line Items]
Aggregate offering amount			$ 35
Overallotment option
Subsidiary, Sale of Stock [Line Items]
Shares sold in the program	282,300	285,000
Gross proceeds from common stock	$ 4,326
Net proceeds of commissions to sales agent	$ 33,700
Public offering
Subsidiary, Sale of Stock [Line Items]
Shares sold in the program		1,900,000
Net proceeds of commissions to sales agent		$ 29,374
Offering price		$ 15.81

STOCKHOLDERS' EQUITY - Schedule

STOCKHOLDERS' EQUITY - Schedule of Stockholder's Equity (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		9 Months Ended
	Mar. 15, 2021	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Subsidiary, Sale of Stock [Line Items]
Total Shares Issued			214,278	80,421	390,842
Gross proceeds from common stock			$ 3,320	$ 1,225	$ 6,113
Average Price Per Share			$ 15.49	$ 15.23	$ 15.64
Average price per share, inclusive offering expenses		$ 0	$ 15.22	$ 13.72	$ 15.27
ATM Program
Subsidiary, Sale of Stock [Line Items]
Total Shares Issued			94,897	16,678	256,952
Gross proceeds from common stock	$ 4,359
DRIP
Subsidiary, Sale of Stock [Line Items]
Total Shares Issued			119,381	63,743	133,890

FINANCIAL HIGHLIGHTS (Details)

FINANCIAL HIGHLIGHTS (Details) - USD ($)	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Per share data:
Net asset value, beginning of period	$ 15.10	$ 15.23
Investment operations:
Net investment income	1.13	1.03
Net realized and unrealized gains(losses) on investments and foreign currency transactions	(0.40)	0.27
Net increase in net assets resulting from operations	0.73	1.30
Distributions declared from net investment income	(1.07)	(1.07)
Net asset value, end of period	$ 14.76	$ 15.46
Total annualized return based on market value	(37.95%)	15.82%
Total annualized return based on net asset value	6.49%	11.26%
Net assets, end of period	$ 343,019	$ 323,724
Per share market value at end of period	$ 11.10	$ 15.22
Shares outstanding end of period	23,243,088	20,936,874
Ratios/Supplemental Data:
Ratio of expenses before incentive fees to average net assets	11.95%	10.70%
Ratio of incentive fees to average net assets	1.64%	2.81%
Ratio of total expenses to average net assets	13.59%	13.51%
Ratio of net investment income to average net assets	10.05%	8.91%
Portfolio turnover ratio	28.41%	49.34%

CHANGE IN NET ASSETS RESULTIN_3

CHANGE IN NET ASSETS RESULTING FROM OPERATIONS PER COMMON SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
CHANGE IN NET ASSETS RESULTING FROM OPERATIONS PER COMMON SHARE
Net increase in net assets resulting from operations	$ 3,845	$ 8,275	$ 16,901	$ 26,951
Weighted average shares outstanding, basic	23,243,088	20,851,435	23,224,990	20,677,545
Weighted average shares outstanding, diluted	23,243,088	20,851,435	23,224,990	20,677,545
Basic per share net increase in net assets resulting from operations	$ 0.17	$ 0.40	$ 0.73	$ 1.30
Diluted per share net increase in net assets resulting from operations	$ 0.17	$ 0.40	$ 0.73	$ 1.30

SUBSEQUENT EVENTS - (Details)

SUBSEQUENT EVENTS - (Details)	Oct. 14, 2022 $ / shares
Subsequent Event
Subsequent Event [Line Items]
Declared special distribution of per share	$ 0.05

N-2

N-2	9 Months Ended
	Sep. 30, 2022
Cover [Abstract]
Entity Central Index Key	0001552198
Amendment Flag	false
Securities Act File Number	814-00967
Document Type	10-Q
Entity Registrant Name	WHITEHORSE FINANCE, INC
Entity Address, Address Line One	1450 Brickell Avenue
Entity Address, Address Line Two	31st Floor
Entity Address, City or Town	Miami
Entity Address, State or Province	FL
Entity Address, Postal Zip Code	33131
City Area Code	305
Local Phone Number	381-6999
Entity Emerging Growth Company	false
General Description of Registrant [Abstract]
Investment Objectives and Practices [Text Block]	Our investment activities are managed by WhiteHorse Advisers and are supervised by our board of directors, a majority of whom are independent of us, WhiteHorse Advisers and its affiliates. Under our investment advisory agreement with WhiteHorse Advisers, or the Investment Advisory Agreement, we have agreed to pay WhiteHorse Advisers an annual base management fee based on our average consolidated gross assets as well as an incentive fee based on our investment performance. We have also entered into an administration agreement, or the Administration Agreement, with H.I.G. WhiteHorse Administration, LLC, or WhiteHorse Administration. Under our Administration Agreement, we have agreed to reimburse WhiteHorse Administration for our allocable portion (subject to the review and approval of our independent directors) of overhead and other expenses incurred by WhiteHorse Administration in performing its obligations under the Administration Agreement.
Risk Factors [Table Text Block]	Item 1A. Risk Factors In addition to the below risk factor and other information set forth in this report, you should carefully consider the “Risk Factors” discussed in our most recent Annual Report on Form 10-K, which could materially affect our business, financial condition and/or operating results. Additional risks and uncertainties not currently known to us or that we currently deem to be immaterial also may materially affect our business, financial condition and/or operating results. We are exposed to risks associated with changes in interest rates, including the current rising interest rate environment. General interest rate fluctuations may have a substantial negative impact on our investments and our investment returns and, accordingly, may have a material adverse effect on our investment objective and our net investment income. Because we borrow money and may issue debt securities or preferred stock to make investments, our net investment income is dependent upon the difference between the rate at which we borrow funds or pay interest or dividends on such debt securities or preferred stock and the rate at which we invest these funds. In this period of rising interest rates, our interest income will increase as the majority of our portfolio bears interest at variable rates while our cost of funds will also increase, to a lesser extent, given a portion of our indebtedness bears interest at fixed rates, with the net impact being an increase to our net investment income, see “Item 3. Quantitative and Qualitative Disclosures About Market Risk.” Conversely, if interest rates decrease we may earn less interest income from investments and our cost of funds will also decrease, to a lesser extent, resulting in lower net investment income. From time to time, we may also enter into certain hedging transactions to mitigate our exposure to changes in interest rates. However, we cannot assure you that such transactions will be successful in mitigating our exposure to interest rate risk. There can be no assurance that a significant change in market interest rates will not have a material adverse effect on our net investment income. ​ Our portfolio primarily consists of fixed and floating rate investments. Market prices tend to fluctuate more for fixed-rate securities that have longer maturities. Although we have no policy governing the maturities of our investments, under current market conditions we expect that we will invest in a portfolio of debt generally having maturities of up to 10 years. Market prices for debt that pays a fixed rate of return tend to decline as interest rates rise. This means that we are subject to greater risk (other things being equal) than a fund invested solely in shorter-term, fixed-rate securities. Market prices for floating rate investments may also fluctuate in rising rate environments with prices tending to decline when credit spreads widen. A decline in the prices of the debt we own could adversely affect our net assets resulting from operations and the market price of our common stock. Rising interest rates may also increase the cost of debt for our underlying portfolio companies, which could adversely impact their financial performance and ability to meet ongoing obligations to us. Also, an increase in interest rates available to investors could make an investment in our common stock less attractive if we are not able to pay dividends at a level that provides a similar return, which could reduce the value of our common stock. If general interest rates rise, there is a risk that the portfolio companies in which we hold floating rate securities will be unable to pay escalating interest amounts, which could result in a default under their loan documents with us. Rising interest rates could also cause portfolio companies to shift cash from other productive uses to the payment of interest, which may have a material adverse effect on their business and operations and could, over time, lead to increased defaults. In addition, rising interest rates may increase pressure on us to provide fixed rate loans to our portfolio companies, which could adversely affect our net investment income, as increases in our cost of borrowed funds would not be accompanied by increased interest income from such fixed-rate investments. Inflation has adversely affected and may continue to adversely affect the business, results of operations and financial condition of our portfolio companies. Certain of our portfolio companies are in industries that have been impacted by inflation. Recent inflationary pressures have increased the costs of labor, energy and raw materials and have adversely affected consumer spending, economic growth and our portfolio companies’ operations. If such portfolio companies are unable to pass any increases in their costs of operations along to their customers, it could adversely affect their operating results and impact their ability to pay interest and principal on our loans, particularly if interest rates rise in response to inflation. In addition, any projected future decreases in our portfolio companies’ operating results due to inflation could adversely impact the fair value of those investments. Any decreases in the fair value of our investments could result in future realized or unrealized losses and therefore reduce our net assets resulting from operations. Additionally, the Federal Reserve has raised, and has indicated its intent to continue raising, certain benchmark interest rates in an effort to combat inflation. See “—We are exposed to risks associated with changes in interest rates, including the current rising interest rate environment.” We intend to continue to finance our investments with borrowed money, which will magnify the potential for gain or loss on amounts invested and may increase the risk of investing in us. The use of leverage, including through the issuance of senior securities, magnifies the potential for gain or loss on amounts invested. We have incurred leverage in the past and currently incur leverage through credit facilities and issuance of public and private notes. From time to time, we intend to incur additional leverage to the extent permitted under the 1940 Act. The use of leverage is generally considered a speculative investment technique and increases the risks associated with investing in our securities. In the future, we may borrow from, and issue senior securities to, banks, insurance companies and other lenders. Holders of these senior securities will have fixed dollar claims on our assets that are superior to the claims of our common stockholders, and we would expect such holders to seek recovery against our assets in the event of a default. ​ WhiteHorse Credit has pledged, and expects to continue to pledge, all or substantially all of its assets. WhiteHorse Credit has granted, and may in the future grant, a security interest in all or a portion of its assets under the Credit Facility. In addition, under the terms of the Credit Facility, we must use the net proceeds of any investments that we sell to repay amounts then due with respect to our debt and certain other amounts owing under the Credit Facility before applying such net proceeds to other uses, such as distributing them to our stockholders. We may pledge up to 100% of our assets and may grant a security interest in all of our assets under the terms of any debt instruments into which we may enter. In addition, under the terms of any credit facility or other debt instrument we enter into, we are likely to be required by its terms to use the net proceeds of any investments that we sell to repay a portion of the amount borrowed under such facility or instrument before applying such net proceeds to any other uses. If the value of our assets decreases, leverage would cause our net asset value to decline more sharply than it otherwise would have had we not leveraged, thereby magnifying losses or eliminating our equity stake in a leveraged investment. Similarly, any decrease in our revenue or income will cause our net income to decline more sharply than it would have had we not borrowed. Such a decline would also negatively affect our ability to make distributions on our common stock or preferred stock. Our ability to service our debt will depend largely on our financial performance and will be subject to prevailing economic conditions and competitive pressures. In addition, our common stockholders will bear the burden of any increase in our expenses as a result of our use of leverage, including interest expenses and any increase in the management fee payable to WhiteHorse Advisers. As a business development company, we generally are required to meet a coverage ratio of total assets to total borrowings and other senior securities, which include all of our borrowings and any preferred stock that we may issue in the future, of at least 150%, subject to certain disclosure requirements, as is specified in the 1940 Act. If this ratio declines below 150%, we cannot incur additional debt and could be required to sell a portion of our investments to repay some debt when it is disadvantageous to do so. This could have a material adverse effect on our operations, and we may not be able to make distributions to our stockholders. As of September 30, 2022, our total outstanding indebtedness was $436.1 million and our asset coverage was 178.7%. The amount of leverage that we employ will depend on WhiteHorse Advisers’ and our board of directors’ assessment of market and other factors at the time of any proposed borrowing. We cannot assure you that we will be able to maintain our borrowings under our existing indebtedness or to obtain other credit at all or on terms acceptable to us. For information regarding a reduction in the asset coverage ratio applicable to us, see Item 1A. Risk Factors - “ The SBCAA allows us to incur additional leverage, which may increase the risk of investing with us In addition, the terms governing our existing indebtedness and any indebtedness that we incur in the future could impose financial and operating covenants that restrict our business activities, including limitations that may hinder our ability to finance additional loans and investments or make the distributions required to maintain our ability to be subject to tax as a RIC. The instruments governing our existing indebtedness contain terms and conditions for senior unsecured notes issued in a private placement, including minimum stockholders’ equity, minimum asset coverage ratio, maximum debt to equity ratio and prohibitions on certain fundamental changes of the Company or any subsidiary guarantor. These instruments also contain customary events of default with customary cure and notice periods, including, without limitation, nonpayment, incorrect representation in any material respect, breach of covenant, cross-default under other indebtedness of the Company or certain significant subsidiaries, certain judgements and orders, and certain events of bankruptcy. ​ The breach of any of the covenants or restrictions, unless cured within the applicable grace period, would result in a default under the applicable indebtedness arrangement that would permit the lenders thereunder to declare all amounts outstanding to be due and payable. In such an event, we may not have sufficient assets to repay such indebtedness. As a result, any default could have serious consequences to our financial condition. An event of default or an acceleration under these arrangements could also cause a cross-default or cross-acceleration of another debt instrument or contractual obligation, which would adversely impact our liquidity. We may not be granted waivers or amendments to these arrangements if for any reason we are unable to comply with them, and we may not be able to refinance such arrangements on terms acceptable to us, or at all. The reduction of our asset coverage requirement from 200% to 150% increases the amount of debt that we are permitted to incur, such that the Company’s maximum debt to equity ratio increased from a prior maximum of 1.0x (equivalent of $1 of debt outstanding for each $1 equity) to a maximum of 2.0x (equivalent to $2 of debt outstanding for each $1 of equity). Increased leverage could amplify the risks associated with investing in the Company. For example, if the value of the Company’s assets decreases, although the asset base and expected revenues would be larger because increased leverage would permit the Company to acquire additional assets, leverage will cause the Company’s net asset value to decline more sharply than it otherwise would have without leverage or with lower leverage. Any decrease in the Company’s revenue would cause its net income to decline more sharply, on a relative basis, than it would have if the Company had not borrowed or had borrowed less. The following table illustrates the effect of leverage on returns from an investment in our common stock as of September 30, 2022, assuming that we employ leverage such that our asset coverage equals (1) our actual asset coverage as of September 30, 2022 and (2) 150%, each at various annual returns, net of expenses and as of September 30, 2022. The purpose of this table is to assist investors in understanding the effects of leverage. The calculations in the table below are hypothetical and actual returns may be higher or lower than those appearing in the table below. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Assumed Return on Our Portfolio (Net of Expenses) ​ -10% -5% 0% 5% 10% Corresponding return to common stockholder assuming actual asset coverage (1) (27.8) % (16.7) % (5.5) % 5.6 % 16.8 % Corresponding return to common stockholder assuming 150% asset coverage (2) ​ (40.3) % (25.5) % (10.8) % 4.0 % 18.8 % (1) Assumes $796.7 million in total assets, $436.1 million in debt outstanding and $343.0 million in net assets as of September 30, 2022, and an average cost of funds of 5.3%, which is our weighted average borrowing cost as of September 30, 2022. (2) Assumes $1,046.6 million in total assets, $686.0 million in debt outstanding and $343.0 million in net assets as of September 30, 2022, and an average cost of funds of 5.4%, which would be our weighted average borrowing cost assuming 150% asset coverage as of September 30, 2022. Based on our outstanding indebtedness of $436.1 million as of September 30, 2022 and an average cost of funds of 5.61%, 6.000%, 5.375%, 5.375%, 4.000%, 5.625% and 4.250%, which were the effective annualized interest rates of the Credit Facility, 6.000% 2023 Notes, 5.375% 2025 Notes, 5.375% 2026 Notes, 4.000% 2026 Notes, 5.625% 2027 Notes and 4.250% 2028 Notes, respectively, as of that date, our investment portfolio must experience an annual return of at least 3.0% to cover annual interest payments on our outstanding indebtedness. Based on our outstanding indebtedness of $686.0 million on an assumed 150% asset coverage ratio and an average cost of funds of 5.61%, 6.000%, 5.375%, 5.375%, 4.000%, 5.625% and 4.250%, which were the effective annualized interest rates of the Credit Facility, 6.000% 2023 Notes, 5.375% 2025 Notes, 5.375% 2026 Notes, 4.000% 2026 Notes, 5.625% 2027 Notes and 4.250% 2028 Notes, respectively, as of that date, our investment portfolio must experience an annual return of at least 3.6% to cover annual interest payments on our outstanding indebtedness.
Risk [Text Block]	We intend to continue to finance our investments with borrowed money, which will magnify the potential for gain or loss on amounts invested and may increase the risk of investing in us. The use of leverage, including through the issuance of senior securities, magnifies the potential for gain or loss on amounts invested. We have incurred leverage in the past and currently incur leverage through credit facilities and issuance of public and private notes. From time to time, we intend to incur additional leverage to the extent permitted under the 1940 Act. The use of leverage is generally considered a speculative investment technique and increases the risks associated with investing in our securities. In the future, we may borrow from, and issue senior securities to, banks, insurance companies and other lenders. Holders of these senior securities will have fixed dollar claims on our assets that are superior to the claims of our common stockholders, and we would expect such holders to seek recovery against our assets in the event of a default. ​ WhiteHorse Credit has pledged, and expects to continue to pledge, all or substantially all of its assets. WhiteHorse Credit has granted, and may in the future grant, a security interest in all or a portion of its assets under the Credit Facility. In addition, under the terms of the Credit Facility, we must use the net proceeds of any investments that we sell to repay amounts then due with respect to our debt and certain other amounts owing under the Credit Facility before applying such net proceeds to other uses, such as distributing them to our stockholders. We may pledge up to 100% of our assets and may grant a security interest in all of our assets under the terms of any debt instruments into which we may enter. In addition, under the terms of any credit facility or other debt instrument we enter into, we are likely to be required by its terms to use the net proceeds of any investments that we sell to repay a portion of the amount borrowed under such facility or instrument before applying such net proceeds to any other uses. If the value of our assets decreases, leverage would cause our net asset value to decline more sharply than it otherwise would have had we not leveraged, thereby magnifying losses or eliminating our equity stake in a leveraged investment. Similarly, any decrease in our revenue or income will cause our net income to decline more sharply than it would have had we not borrowed. Such a decline would also negatively affect our ability to make distributions on our common stock or preferred stock. Our ability to service our debt will depend largely on our financial performance and will be subject to prevailing economic conditions and competitive pressures. In addition, our common stockholders will bear the burden of any increase in our expenses as a result of our use of leverage, including interest expenses and any increase in the management fee payable to WhiteHorse Advisers. As a business development company, we generally are required to meet a coverage ratio of total assets to total borrowings and other senior securities, which include all of our borrowings and any preferred stock that we may issue in the future, of at least 150%, subject to certain disclosure requirements, as is specified in the 1940 Act. If this ratio declines below 150%, we cannot incur additional debt and could be required to sell a portion of our investments to repay some debt when it is disadvantageous to do so. This could have a material adverse effect on our operations, and we may not be able to make distributions to our stockholders. As of September 30, 2022, our total outstanding indebtedness was $436.1 million and our asset coverage was 178.7%. The amount of leverage that we employ will depend on WhiteHorse Advisers’ and our board of directors’ assessment of market and other factors at the time of any proposed borrowing. We cannot assure you that we will be able to maintain our borrowings under our existing indebtedness or to obtain other credit at all or on terms acceptable to us. For information regarding a reduction in the asset coverage ratio applicable to us, see Item 1A. Risk Factors - “ The SBCAA allows us to incur additional leverage, which may increase the risk of investing with us In addition, the terms governing our existing indebtedness and any indebtedness that we incur in the future could impose financial and operating covenants that restrict our business activities, including limitations that may hinder our ability to finance additional loans and investments or make the distributions required to maintain our ability to be subject to tax as a RIC. The instruments governing our existing indebtedness contain terms and conditions for senior unsecured notes issued in a private placement, including minimum stockholders’ equity, minimum asset coverage ratio, maximum debt to equity ratio and prohibitions on certain fundamental changes of the Company or any subsidiary guarantor. These instruments also contain customary events of default with customary cure and notice periods, including, without limitation, nonpayment, incorrect representation in any material respect, breach of covenant, cross-default under other indebtedness of the Company or certain significant subsidiaries, certain judgements and orders, and certain events of bankruptcy. ​ The breach of any of the covenants or restrictions, unless cured within the applicable grace period, would result in a default under the applicable indebtedness arrangement that would permit the lenders thereunder to declare all amounts outstanding to be due and payable. In such an event, we may not have sufficient assets to repay such indebtedness. As a result, any default could have serious consequences to our financial condition. An event of default or an acceleration under these arrangements could also cause a cross-default or cross-acceleration of another debt instrument or contractual obligation, which would adversely impact our liquidity. We may not be granted waivers or amendments to these arrangements if for any reason we are unable to comply with them, and we may not be able to refinance such arrangements on terms acceptable to us, or at all. The reduction of our asset coverage requirement from 200% to 150% increases the amount of debt that we are permitted to incur, such that the Company’s maximum debt to equity ratio increased from a prior maximum of 1.0x (equivalent of $1 of debt outstanding for each $1 equity) to a maximum of 2.0x (equivalent to $2 of debt outstanding for each $1 of equity). Increased leverage could amplify the risks associated with investing in the Company. For example, if the value of the Company’s assets decreases, although the asset base and expected revenues would be larger because increased leverage would permit the Company to acquire additional assets, leverage will cause the Company’s net asset value to decline more sharply than it otherwise would have without leverage or with lower leverage. Any decrease in the Company’s revenue would cause its net income to decline more sharply, on a relative basis, than it would have if the Company had not borrowed or had borrowed less. The following table illustrates the effect of leverage on returns from an investment in our common stock as of September 30, 2022, assuming that we employ leverage such that our asset coverage equals (1) our actual asset coverage as of September 30, 2022 and (2) 150%, each at various annual returns, net of expenses and as of September 30, 2022. The purpose of this table is to assist investors in understanding the effects of leverage. The calculations in the table below are hypothetical and actual returns may be higher or lower than those appearing in the table below. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Assumed Return on Our Portfolio (Net of Expenses) ​ -10% -5% 0% 5% 10% Corresponding return to common stockholder assuming actual asset coverage (1) (27.8) % (16.7) % (5.5) % 5.6 % 16.8 % Corresponding return to common stockholder assuming 150% asset coverage (2) ​ (40.3) % (25.5) % (10.8) % 4.0 % 18.8 % (1) Assumes $796.7 million in total assets, $436.1 million in debt outstanding and $343.0 million in net assets as of September 30, 2022, and an average cost of funds of 5.3%, which is our weighted average borrowing cost as of September 30, 2022. (2) Assumes $1,046.6 million in total assets, $686.0 million in debt outstanding and $343.0 million in net assets as of September 30, 2022, and an average cost of funds of 5.4%, which would be our weighted average borrowing cost assuming 150% asset coverage as of September 30, 2022. Based on our outstanding indebtedness of $436.1 million as of September 30, 2022 and an average cost of funds of 5.61%, 6.000%, 5.375%, 5.375%, 4.000%, 5.625% and 4.250%, which were the effective annualized interest rates of the Credit Facility, 6.000% 2023 Notes, 5.375% 2025 Notes, 5.375% 2026 Notes, 4.000% 2026 Notes, 5.625% 2027 Notes and 4.250% 2028 Notes, respectively, as of that date, our investment portfolio must experience an annual return of at least 3.0% to cover annual interest payments on our outstanding indebtedness. Based on our outstanding indebtedness of $686.0 million on an assumed 150% asset coverage ratio and an average cost of funds of 5.61%, 6.000%, 5.375%, 5.375%, 4.000%, 5.625% and 4.250%, which were the effective annualized interest rates of the Credit Facility, 6.000% 2023 Notes, 5.375% 2025 Notes, 5.375% 2026 Notes, 4.000% 2026 Notes, 5.625% 2027 Notes and 4.250% 2028 Notes, respectively, as of that date, our investment portfolio must experience an annual return of at least 3.6% to cover annual interest payments on our outstanding indebtedness.
Effects of Leverage [Table Text Block]	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Assumed Return on Our Portfolio (Net of Expenses) ​ -10% -5% 0% 5% 10% Corresponding return to common stockholder assuming actual asset coverage (1) (27.8) % (16.7) % (5.5) % 5.6 % 16.8 % Corresponding return to common stockholder assuming 150% asset coverage (2) ​ (40.3) % (25.5) % (10.8) % 4.0 % 18.8 % (1) Assumes $796.7 million in total assets, $436.1 million in debt outstanding and $343.0 million in net assets as of September 30, 2022, and an average cost of funds of 5.3%, which is our weighted average borrowing cost as of September 30, 2022. (2) Assumes $1,046.6 million in total assets, $686.0 million in debt outstanding and $343.0 million in net assets as of September 30, 2022, and an average cost of funds of 5.4%, which would be our weighted average borrowing cost assuming 150% asset coverage as of September 30, 2022.
Return at Minus Ten [Percent]	(27.80%)
Return at Minus Five [Percent]	(16.70%)
Return at Zero [Percent]	(5.50%)
Return at Plus Five [Percent]	5.60%
Return at Plus Ten [Percent]	16.80%
Effects of Leverage, Purpose [Text Block]	The following table illustrates the effect of leverage on returns from an investment in our common stock as of September 30, 2022, assuming that we employ leverage such that our asset coverage equals (1) our actual asset coverage as of September 30, 2022 and (2) 150%, each at various annual returns, net of expenses and as of September 30, 2022. The purpose of this table is to assist investors in understanding the effects of leverage. The calculations in the table below are hypothetical and actual returns may be higher or lower than those appearing in the table below.