Bel Fuse (BELFB) 10-Q 7 Aug 20 2020 Q2 Quarterly report Financial data

Document And Entity Information

Document And Entity Information - shares	6 Months Ended
	Jun. 30, 2020	Aug. 01, 2020
Document Information [Line Items]
Entity Central Index Key	0000729580
Entity Registrant Name	BEL FUSE INC /NJ
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Document Fiscal Period Focus	Q2
Document Fiscal Year Focus	2020
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2020
Document Transition Report	false
Entity File Number	0-11676
Entity Address, Address Line One	206 Van Vorst Street
Entity Address, City or Town	Jersey City
Entity Address, State or Province	NJ
Entity Address, Postal Zip Code	07302
City Area Code	201
Local Phone Number	432-0463
Entity Incorporation, State or Country Code	NJ
Entity Tax Identification Number	22-1463699
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Common Class B [Member]
Document Information [Line Items]
Title of 12(b) Security	Class B Common Stock ($0.10 par value)
Trading Symbol	BELFB
Security Exchange Name	NASDAQ
Entity Common Stock, Shares Outstanding		10,232,602
Common Class A [Member]
Document Information [Line Items]
Title of 12(b) Security	Class A Common Stock ($0.10 par value)
Trading Symbol	BELFA
Security Exchange Name	NASDAQ
Entity Common Stock, Shares Outstanding		2,144,912

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Current Assets:
Cash and cash equivalents	$ 75,288	$ 72,289
Accounts receivable, net of allowance for doubtful accounts of $1,218 and $1,171, respectively	78,346	76,092
Inventories	104,726	107,276
Unbilled receivables	15,334	16,318
Assets held for sale	2,454	0
Other current assets	9,224	11,206
Total current assets	285,372	283,181
Property, plant and equipment, net	37,334	41,943
Right-of-use assets	16,627	18,504
Intangible assets, net	68,466	72,364
Goodwill	22,252	21,993
Deferred income taxes	4,071	3,731
Other assets	27,021	27,201
Total assets	461,143	468,917
Current Liabilities:
Accounts payable	44,826	44,169
Accrued expenses	28,402	26,918
Current portion of long-term debt	2,305	5,489
Operating lease liability, current	6,467	7,377
Other current liabilities	6,179	6,265
Total current liabilities	88,179	90,218
Long-term Liabilities:
Long-term debt	132,937	138,215
Operating lease liability, long-term	10,469	11,751
Liability for uncertain tax positions	27,075	26,901
Minimum pension obligation and unfunded pension liability	21,944	21,545
Deferred income taxes	1,145	1,726
Other liabilities	11,466	10,510
Total liabilities	293,215	300,866
Commitments and contingencies
Stockholders' Equity:
Preferred stock, no par value, 1,000,000 shares authorized; none issued	0	0
Additional paid-in capital	35,036	33,826
Retained earnings	157,157	157,063
Accumulated other comprehensive loss	(25,502)	(24,065)
Total stockholders' equity	167,928	168,051
Total liabilities and stockholders' equity	461,143	468,917
Common Class A [Member]
Stockholders' Equity:
Common stock	214	214
Common Class B [Member]
Stockholders' Equity:
Common stock	$ 1,023	$ 1,013

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Accounts receivable, allowance for doubtful accounts	$ 1,218	$ 1,171
Preferred stock, no par value (in dollars per share)	$ 0	$ 0
Preferred stock, shares authorized (in shares)	1,000,000	1,000,000
Preferred stock, shares issued (in shares)	0	0
Common Class A [Member]
Common stock, par value (in dollars per share)	$ 0.10	$ 0.10
Common stock, shares authorized (in shares)	10,000,000	10,000,000
Common stock, shares outstanding (in shares)	2,144,912	2,144,912
Common stock, treasury shares (in shares)	1,072,769	1,072,769
Common Class B [Member]
Common stock, par value (in dollars per share)	$ 0.10	$ 0.10
Common stock, shares authorized (in shares)	30,000,000	30,000,000
Common stock, shares outstanding (in shares)	10,233,602	10,127,602
Common stock, treasury shares (in shares)	3,218,307	3,218,307

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenue	$ 121,172	$ 127,416	$ 225,149	$ 252,805
Cost of sales	89,403	100,670	168,269	195,325
Gross profit	31,769	26,746	56,880	57,480
Research and development costs	6,116	6,862	12,175	14,036
Selling, general and administrative expenses	18,061	19,215	40,122	38,440
Restructuring charges	44	424	172	1,370
Gain on sale of property	0	(4,257)	0	(4,257)
Income from operations	7,548	4,502	4,411	7,891
Interest expense	(1,250)	(1,381)	(2,601)	(2,820)
Other (expense) income, net	(302)	267	(390)	(513)
Earnings before provision for (benefit from) income taxes	5,996	3,388	1,420	4,558
Provision for (benefit from) income taxes	423	421	(349)	460
Net earnings available to common stockholders	5,573	2,967	1,769	4,098
Common Class A [Member]
Net earnings available to common stockholders	$ 923	$ 494	$ 274	$ 673
Net earnings per common share:
Common shares - basic and diluted (in dollars per share)	$ 0.43	$ 0.23	$ 0.13	$ 0.31
Weighted-average number of shares outstanding:
Common shares - basic and diluted (in shares)	2,145	2,175	2,145	2,175
Common Class B [Member]
Net earnings available to common stockholders	$ 4,650	$ 2,473	$ 1,495	$ 3,425
Net earnings per common share:
Common shares - basic and diluted (in dollars per share)	$ 0.46	$ 0.24	$ 0.15	$ 0.34
Weighted-average number of shares outstanding:
Common shares - basic and diluted (in shares)	10,178	10,112	10,151	10,100

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Comprehensive (Loss) Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Net earnings available to common stockholders	$ 5,573	$ 2,967	$ 1,769	$ 4,098
Other comprehensive income (loss):
Currency translation adjustment, net of taxes of ($3) in the three months ended June 30, 2020, $16 in the three months ended June 30, 2019, ($30) in the six months ended June 30, 2020 and ($1) in the six months ended June 30, 2019	676	(834)	(1,569)	(294)
Change in unfunded SERP liability, net of taxes of ($20) in the three months ended June 30, 2020, ($11) in the three months ended June 30, 2019, ($40) in the six months ended June 30, 2020 and ($22) in the six months ended June 30, 2019	66	37	132	74
Other comprehensive income (loss)	742	(797)	(1,437)	(220)
Comprehensive income	$ 6,315	$ 2,170	$ 332	$ 3,878

Condensed Consolidated Statem_3

Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Common Class A [Member]Retained Earnings [Member]	Common Class A [Member]AOCI Attributable to Parent [Member]	Common Class A [Member]Common Stock, Common Class A [Member]	Common Class A [Member]Common Stock, Common Class B [Member]	Common Class A [Member]Additional Paid-in Capital [Member]	Common Class A [Member]	Common Class B [Member]Retained Earnings [Member]	Common Class B [Member]AOCI Attributable to Parent [Member]	Common Class B [Member]Common Stock, Common Class A [Member]	Common Class B [Member]Common Stock, Common Class B [Member]	Common Class B [Member]Additional Paid-in Capital [Member]	Common Class B [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member]Retained Earnings [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member]AOCI Attributable to Parent [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member]Common Stock, Common Class A [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member]Common Stock, Common Class B [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member]Additional Paid-in Capital [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Common Stock, Common Class A [Member]	Common Stock, Common Class B [Member]	Additional Paid-in Capital [Member]	Total
Balance at Dec. 31, 2018													$ 463	$ (463)	$ 0	$ 0	$ 0	$ 0	$ 168,695	$ (24,838)	$ 217	$ 1,009	$ 31,387	$ 176,470
Net earnings (loss)																			1,131	0	0	0	0	1,131
Cash dividends declared on common stock	$ (130)	$ 0	$ 0	$ 0	$ 0	$ (130)	$ (708)	$ 0	$ 0	$ 0	$ 0	$ (708)
Forfeiture of restricted common stock																			0	0	0	(1)		0
Forfeiture of restricted common stock, APIC																							1
Foreign currency translation adjustment, net of taxes																			0	540	0	0	0	540
Stock-based compensation expense																			0	0	0	0	813	813
Change in unfunded SERP liability, net of taxes																			0	37	0	0	0	37
Balance at Mar. 31, 2019																			169,451	(24,724)	217	1,008	32,201	178,153
Balance at Dec. 31, 2018													$ 463	$ (463)	$ 0	$ 0	$ 0	$ 0	168,695	(24,838)	217	1,009	31,387	176,470
Net earnings (loss)						673						3,425												4,098
Cash dividends declared on common stock						(261)						(1,412)
Foreign currency translation adjustment, net of taxes																								(294)
Change in unfunded SERP liability, net of taxes																								74
Balance at Jun. 30, 2019																			171,583	(25,521)	217	1,014	32,983	180,276
Balance at Mar. 31, 2019																			169,451	(24,724)	217	1,008	32,201	178,153
Net earnings (loss)						494						2,473							2,967	0	0	0	0	2,967
Cash dividends declared on common stock	(131)	0	0	0	0	(131)	(704)	0	0	0	0	(704)
Forfeiture of restricted common stock																			0	0	0	(1)		0
Forfeiture of restricted common stock, APIC																							1
Foreign currency translation adjustment, net of taxes																			0	(834)	0	0	0	(834)
Stock-based compensation expense																			0	0				788
Change in unfunded SERP liability, net of taxes																			0	37	0	0	0	37
Issuance of restricted common stock																						7	(7)	0
Balance at Jun. 30, 2019																			171,583	(25,521)	217	1,014	32,983	180,276
Balance at Dec. 31, 2019																			157,063	(24,065)	214	1,013	33,826	168,051
Net earnings (loss)																			(3,804)	0	0	0	0	(3,804)
Cash dividends declared on common stock	(130)	0	0	0	0	(130)	(709)	0	0	0	0	(709)
Forfeiture of restricted common stock																			0	0	0	(1)		0
Forfeiture of restricted common stock, APIC																							1
Foreign currency translation adjustment, net of taxes																			0	(2,245)	0	0	0	(2,245)
Stock-based compensation expense																			0	0	0	0	603	603
Change in unfunded SERP liability, net of taxes																			0	66	0	0	0	66
Balance at Mar. 31, 2020																			152,420	(26,244)	214	1,012	34,430	161,832
Balance at Dec. 31, 2019																			157,063	(24,065)	214	1,013	33,826	168,051
Net earnings (loss)						274						1,495												1,769
Cash dividends declared on common stock						(259)						(1,416)
Foreign currency translation adjustment, net of taxes																								(1,569)
Change in unfunded SERP liability, net of taxes																								132
Balance at Jun. 30, 2020																			157,157	(25,502)	214	1,023	35,036	167,928
Balance at Mar. 31, 2020																			152,420	(26,244)	214	1,012	34,430	161,832
Net earnings (loss)						923						4,650							5,573	0	0	0	0	5,573
Cash dividends declared on common stock	$ (129)	$ 0	$ 0	$ 0	$ 0	$ (129)	$ (707)	$ 0	$ 0	$ 0	$ 0	$ (707)
Forfeiture of restricted common stock																			0	0	0	11		0
Forfeiture of restricted common stock, APIC																							(11)
Foreign currency translation adjustment, net of taxes																			0	676	0	0	0	676
Stock-based compensation expense																			0	0	0	0	617	617
Change in unfunded SERP liability, net of taxes																			0	66	0	0	0	66
Balance at Jun. 30, 2020																			$ 157,157	$ (25,502)	$ 214	$ 1,023	$ 35,036	$ 167,928

Condensed Consolidated Statem_4

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Cash flows from operating activities:
Net earnings	$ 1,769	$ 4,098
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	8,234	8,216
Stock-based compensation	1,220	1,601
Amortization of deferred financing costs	316	232
Deferred income taxes	(1,030)	(1,002)
Net unrealized gains/losses on foreign currency revaluation	58	123
Gain on sale of property	0	(4,257)
Other, net	105	1,316
Changes in operating assets and liabilities:
Accounts receivable, net	(2,463)	7,734
Unbilled receivables	984	4,329
Inventories	1,906	1,799
Accounts payable	994	(13,350)
Accrued expenses	1,307	(2,052)
Other operating assets/liabilities, net	3,443	(1,032)
Net cash provided by operating activities	16,843	7,755
Cash flows from investing activities:
Purchases of property, plant and equipment	(2,980)	(5,329)
Proceeds from disposal/sale of property, plant and equipment	20	5,784
Net cash (used in) provided by investing activities	(2,960)	455
Cash flows from financing activities:
Dividends paid to common stockholders	(1,613)	(1,600)
Deferred financing costs	(600)	0
Borrowings under revolving credit line	0	12,000
Repayments of revolving credit line	0	(12,000)
Repayments of long-term debt	(8,179)	(1,487)
Net cash used in financing activities	(10,392)	(3,087)
Effect of exchange rate changes on cash and cash equivalents	(492)	(639)
Net increase in cash and cash equivalents	2,999	4,484
Cash and cash equivalents - beginning of period	72,289	53,911
Cash and cash equivalents - end of period	75,288	58,395
Supplementary information:
Income taxes, net of refunds received	1,473	2,805
Interest payments	$ 2,339	$ 2,533

Note 1 - Basis of Presentation

Note 1 - Basis of Presentation and Accounting Policies	6 Months Ended
	Jun. 30, 2020
Notes to Financial Statements
Basis of Presentation and Significant Accounting Policies [Text Block]	1. BASIS OF PRESENTATION AND ACCOUNTING POLICIES The condensed consolidated balance sheets and statements of operations, comprehensive income, stockholders’ equity and cash flows for the periods presented herein have been prepared by the Company and are unaudited. In the opinion of management, all adjustments (consisting solely of normal recurring adjustments) necessary to present fairly the consolidated financial position, results of operations and cash flows for all periods presented have been made. The results for the three six June 30, 2020 not 10 December 31, 2019 Certain information and footnote disclosures required under accounting principles generally accepted in the United States of America (“U.S. GAAP”) have been condensed or omitted from these condensed consolidated financial statements pursuant to the rules and regulations, including the interim reporting requirements, of the U.S. Securities and Exchange Commission (“SEC”). The preparation of condensed consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts and the disclosure of contingent amounts in our condensed consolidated financial statements and accompanying notes. Actual results could differ from these estimates. The Company’s significant accounting policies are summarized in Note 1 10 December 31, 2019 no six June 30, 2020 Reclassifications fourth 2019, three six June 30, 2019, fourth 2019, $0.5 three six June 30, 2019, fourth 2019. three 14 three six June 30, 2019 All amounts included in the tables to these notes to condensed consolidated financial statements, except per share amounts, are in thousands. Recently Adopted Accounting Standards In August 2018, 2018 13, Fair Value Measurement (Topic 820 December 15, 2019. January 1, 2020. not In August 2018, 2018 15, Intangibles – Goodwill and Other-Internal-Use Software (Subtopic 350 40 December 15, 2019. January 1, 2020 not Accounting Standards Issued But Not In June 2016, No. 2016 13, Financial Instruments – Credit Losses (Topic 326 2016 13” December 15, 2022, 2016 13, not In August 2018, 2018 14, Compensation-Retirement Benefits-Defined Benefit Plans-General (Subtopic 715 20 2018 14" not December 15, 2020. 2018 14 In December 2019, 2019 12, Simplifying the Accounting for Income Taxes ("ASU 2019 12" 740 2019 12 December 15, 2020. 2019 12, not

Note 2 - Acquisitions

Note 2 - Acquisitions	6 Months Ended
	Jun. 30, 2020
Notes to Financial Statements
Business Combination Disclosure [Text Block]	2. ACQUISITION On December 3, 2019, December 31, 2019. one During the three six June 30, 2020, While the purchase price allocation related to CUI is substantially complete, the allocations are currently under review and are subject to change. The Company expects to finalize the purchase price allocation as soon as practicable, but no one CUI’s results of operations have been included in the Company’s condensed consolidated financial statements for the period subsequent to the acquisition date. CUI contributed revenues of $10.6 million and estimated net earnings of $2.3 million to the Company for the three June 30, 2020 six June 30, 2020. January 1, 2019: Three Months Ended Six Months Ended June 30, 2019 June 30, 2019 Revenue $ 135,847 $ 270,504 Net earnings 3,383 5,069 Earnings per Class A common share - basic and diluted 0.26 0.39 Earnings per Class B common share - basic and diluted 0.28 0.42

Note 3 - Revenue

Note 3 - Revenue	6 Months Ended
	Jun. 30, 2020
Notes to Financial Statements
Revenue from Contract with Customer [Text Block]	3. REVENUE The following table provides information about disaggregated revenue by geographic region and sales channel, and includes a reconciliation of the disaggregated revenue to our reportable segments: Three Months Ended June 30, 2020 Six Months Ended June 30, 2020 Cinch Connectivity Solutions Power Solutions and Protection Magnetic Solutions Consolidated Cinch Connectivity Solutions Power Solutions and Protection Magnetic Solutions Consolidated By Product Group: North America $ 27,608 $ 29,029 $ 7,097 $ 63,734 $ 57,310 $ 51,752 $ 14,204 $ 123,266 Europe 8,356 8,965 1,717 19,038 16,118 18,279 2,918 37,315 Asia 2,944 7,118 28,338 38,400 4,579 11,258 48,731 64,568 $ 38,908 $ 45,112 $ 37,152 $ 121,172 $ 78,007 $ 81,289 $ 65,853 $ 225,149 By Sales Channel: Direct to customer $ 23,600 $ 26,894 $ 31,021 $ 81,515 $ 48,652 $ 48,471 $ 55,363 $ 152,486 Through distribution 15,308 18,218 6,131 39,657 29,355 32,818 10,490 72,663 $ 38,908 $ 45,112 $ 37,152 $ 121,172 $ 78,007 $ 81,289 $ 65,853 $ 225,149 Three Months Ended June 30, 2019 Six Months Ended June 30, 2019 Cinch Connectivity Solutions Power Solutions and Protection Magnetic Solutions Consolidated Cinch Connectivity Solutions Power Solutions and Protection Magnetic Solutions Consolidated By Product Group: North America $ 31,297 $ 26,131 $ 9,638 $ 67,066 $ 63,418 $ 49,652 $ 18,583 $ 131,653 Europe 8,212 10,768 2,046 21,026 16,977 23,307 4,267 44,551 Asia 3,027 7,129 29,168 39,324 6,502 13,841 56,258 76,601 $ 42,536 $ 44,028 $ 40,852 $ 127,416 $ 86,897 $ 86,800 $ 79,108 $ 252,805 By Sales Channel: Direct to customer $ 28,207 $ 28,594 $ 34,641 $ 91,442 $ 57,812 $ 57,694 $ 67,158 $ 182,664 Through distribution 14,329 15,434 6,211 35,974 29,085 29,106 11,950 70,141 $ 42,536 $ 44,028 $ 40,852 $ 127,416 $ 86,897 $ 86,800 $ 79,108 $ 252,805 June 30, 2020 December 31, 2019 June 30, December 31, 2020 2019 Contract assets - current (unbilled receivable) $ 15,334 $ 16,318 Contract liabilities - current (deferred revenue) $ 1,148 $ 653 The change in balance of our unbilled receivables from December 31, 2019 June 30, 2020 The aggregate amount of transaction price allocated to remaining not June 30, 2020 one 2021 2025. 2021, 2022 2022.

Note 4 - Earnings Per Share

Note 4 - Earnings Per Share	6 Months Ended
	Jun. 30, 2020
Notes to Financial Statements
Earnings Per Share [Text Block]	4. EARNINGS PER SHARE The following table sets forth the calculation of basic and diluted net earnings per common share under the two three six June 30, 2020 2019 Three Months Ended Six Months Ended June 30, June 30, 2020 2019 2020 2019 Numerator: Net earnings $ 5,573 $ 2,967 $ 1,769 $ 4,098 Less dividends declared: Class A 129 131 259 261 Class B 707 704 1,416 1,412 Undistributed earnings $ 4,737 $ 2,132 $ 94 $ 2,425 Undistributed earnings allocation - basic and diluted: Class A undistributed earnings $ 794 $ 363 $ 15 $ 412 Class B undistributed earnings 3,943 1,769 79 2,013 Total undistributed earnings $ 4,737 $ 2,132 $ 94 $ 2,425 Net earnings allocation - basic and diluted: Class A net earnings $ 923 $ 494 $ 274 $ 673 Class B net earnings 4,650 2,473 1,495 3,425 Net earnings $ 5,573 $ 2,967 $ 1,769 $ 4,098 Denominator: Weighted-average shares outstanding: Class A - basic and diluted 2,145 2,175 2,145 2,175 Class B - basic and diluted 10,178 10,112 10,151 10,100 Net earnings per share: Class A - basic and diluted $ 0.43 $ 0.23 $ 0.13 $ 0.31 Class B - basic and diluted $ 0.46 $ 0.24 $ 0.15 $ 0.34

Note 5 - Fair Value Measurement

Note 5 - Fair Value Measurements	6 Months Ended
	Jun. 30, 2020
Notes to Financial Statements
Fair Value Disclosures [Text Block]	5. FAIR VALUE MEASUREMENTS Fair value is defined as an exit price, representing the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants based upon the best use of the asset or liability at the measurement date. Entities are required to use a fair value hierarchy which maximizes the use of observable inputs and minimizes the use of unobservable inputs when measuring fair value. There are three may Level 1 Level 2 Level 3 no As of June 30, 2020 December 31, 2019 1 June 30, 2020 December 31, 2019 second 2020, June 30, 2020. not 3, no 3 six June 30, 2020 June 30, 2019 no six June 30, 2020 June 30, 2019 There were no June 30, 2020 December 31, 2019 The Company has other financial instruments, such as cash and cash equivalents, accounts receivable, restricted cash, accounts payable and accrued expenses, which are not June 30, 2020 December 31, 2019 not June 30, 2020 Nonfinancial assets and liabilities, such as goodwill, indefinite-lived intangible assets and long-lived assets, are accounted for at fair value on a nonrecurring basis. These items are tested for impairment upon the occurrence of a triggering event or in the case of goodwill, on at least an annual basis. The Company considered the impacts of COVID- 19 six June 30, 2020. no six June 30, 2020

Note 6 - Inventories

Note 6 - Inventories	6 Months Ended
	Jun. 30, 2020
Notes to Financial Statements
Inventory Disclosure [Text Block]	6. INVENTORIES The components of inventories are as follows: June 30, December 31, 2020 2019 Raw materials $ 47,707 $ 47,936 Work in progress 29,139 27,065 Finished goods 27,880 32,275 Inventories $ 104,726 $ 107,276

Note 7 - Property, Plant and Eq

Note 7 - Property, Plant and Equipment	6 Months Ended
	Jun. 30, 2020
Notes to Financial Statements
Property, Plant and Equipment Disclosure [Text Block]	7. PROPERTY, PLANT AND EQUIPMENT Property, plant and equipment consist of the following: June 30, December 31, 2020 2019 Land $ 1,428 $ 1,431 Buildings and improvements 22,647 29,722 Machinery and equipment 124,192 132,134 Construction in progress 2,662 5,090 150,929 168,377 Accumulated depreciation (113,595 ) (126,434 ) Property, plant and equipment, net $ 37,334 $ 41,943 Depreciation expense for the three June 30, 2020 2019 six June 30, 2020 2019

Note 8 - Accrued Expenses

Note 8 - Accrued Expenses	6 Months Ended
	Jun. 30, 2020
Notes to Financial Statements
Accounts Payable and Accrued Liabilities Disclosure [Text Block]	8. ACCRUED EXPENSES Accrued expenses consist of the following: June 30, December 31, 2020 2019 Sales commissions $ 2,685 $ 2,542 Subcontracting labor 1,115 990 Salaries, bonuses and related benefits 15,301 14,715 Warranty accrual 1,368 1,576 Other 7,933 7,095 $ 28,402 $ 26,918 The change in warranty accrual during the six June 30, 2020 no six June 30, 2020 Restructuring Activities Included within other accrued expenses in the table above are costs accrued related to the Company’s restructuring activities. Activity and liability balances related to restructuring costs for the six June 30, 2020 Six Months Ended June 30, 2020 Liability at Cash Payments Liability at December 31, New and Other June 30, 2019 Charges Settlements 2020 Severance costs $ - $ 216 $ (216 ) $ - Other restructuring costs 44 (44 ) - - Total $ 44 $ 172 $ (216 ) $ -

Note 9 - Debt

Note 9 - Debt	6 Months Ended
	Jun. 30, 2020
Notes to Financial Statements
Debt Disclosure [Text Block]	9. DEBT The Company has a Credit and Security Agreement with KeyBank National Association (as amended, the "credit agreement" or the "CSA"). The CSA consists of (i) a term loan, with outstanding borrowings of $104.8 million and $113.0 million at June 30, 2020 December 31, 2019 June 30, 2020 December 31, 2019 December 11, 2022. June 30, 2020 December 31, 2019 On February 18, 2020, The weighted-average interest rate in effect was 3.44% at June 30, 2020 December 31, 2019 three June 30, 2020 June 30, 2019 six June 30, 2020 June 30, 2019, The CSA contains customary representations and warranties, covenants and events of default and financial covenants that measure (i) the ratio of the Company's total funded indebtedness, on a consolidated basis, to the amount of the Company’s consolidated EBITDA, as defined, (“Leverage Ratio”) and (ii) the ratio of the amount of the Company’s consolidated EBITDA to the Company’s consolidated fixed charges ("Fixed Charge Coverage Ratio"). If an event of default occurs, the lenders under the CSA would be entitled to take various actions, including the acceleration of amounts due thereunder and all actions permitted to be taken by a secured creditor. At June 30, 2020

Note 10 - Income Taxes

Note 10 - Income Taxes	6 Months Ended
	Jun. 30, 2020
Notes to Financial Statements
Income Tax Disclosure [Text Block]	10. INCOME TAXES On March 27, 2020, 2019 three March 31, 2020, 2019 2020. 163 30% 50% December 31, 2019. December 31, 2015 three March 31, 2020. three March 31, 2020. The Company and its subsidiaries file income tax returns in the U.S. federal jurisdiction and various states and foreign jurisdictions. The Company is no 2016 2013. no 2009 2011 2014 As a result of the expiration of the statutes of limitations for specific jurisdictions, it is reasonably possible that the related unrecognized benefits for tax positions taken regarding previously filed tax returns may June 30, 2020. June 30, 2020 December 31, 2019, June 30, 2020 December 31, 2019, 2020 The Company’s policy is to recognize interest and penalties related to uncertain tax positions as a component of the current provision for income taxes. During the six June 30, 2020 2019, six June 30, 2020, June 30, 2020 December 31, 2019,

Note 11 - Retirement Fund and P

Note 11 - Retirement Fund and Profit Sharing Plan	6 Months Ended
	Jun. 30, 2020
Notes to Financial Statements
Retirement Benefits [Text Block]	11. RETIREMENT FUND AND PROFIT SHARING PLAN The Company maintains the Bel Fuse Inc. Employees’ Savings Plan, a defined contribution plan that is intended to meet the applicable requirements for tax-qualification under sections 401 1986, three June 30, 2020 2019 six June 30, 2020 2019 June 30, 2020 The Company's subsidiaries in Asia have a retirement fund covering substantially all of their Hong Kong based full-time employees. The expense for the three June 30, 2020 2019 six June 30, 2020 2019 June 30, 2020 The Company maintains a SERP, which is designed to provide a limited group of key management and other key employees of the Company with supplemental retirement and death benefits. As discussed in Note 5 The components of SERP expense are as follows: Three Months Ended Six Months Ended June 30, June 30, 2020 2019 2020 2019 Service cost $ 150 $ 144 $ 300 $ 288 Interest cost 159 185 318 370 Net amortization 86 48 172 96 Net periodic benefit cost $ 395 $ 377 $ 790 $ 754 The service cost component of net benefit cost is presented within cost of sales or selling, general and administrative expense on the accompanying condensed consolidated statements of operations, in accordance with where compensation cost for the related associate is reported. All other components of net benefit cost, including interest cost and net amortization noted above, are presented within other (expense) income, net in the accompanying condensed consolidated statements of operations. The following amounts are recognized net of tax in accumulated other comprehensive loss: June 30, December 31, 2020 2019 Prior service cost $ 662 $ 738 Net loss 1,870 1,965 $ 2,532 $ 2,703

Note 12 - Accumulated Other Com

Note 12 - Accumulated Other Comprehensive Loss	6 Months Ended
	Jun. 30, 2020
Notes to Financial Statements
Comprehensive Income (Loss) Note [Text Block]	12. ACCUMULATED OTHER COMPREHENSIVE LOSS The components of accumulated other comprehensive loss at June 30, 2020 December 31, 2019 June 30, December 31, 2020 2019 Foreign currency translation adjustment, net of taxes of ($711) at June 30, 2020 and ($742) at December 31, 2019 $ (21,600 ) $ (20,032 ) Unrealized holding gains on available-for-sale securities, net of taxes of $0 at June 30, 2020 and $0 at December 31, 2019 11 12 Unfunded SERP liability, net of taxes of ($599) at June 30, 2020 and ($639) at December 31, 2019 (3,913 ) (4,045 ) Accumulated other comprehensive loss $ (25,502 ) $ (24,065 ) Changes in accumulated other comprehensive loss by component during the six June 30, 2020 Unrealized Holding Foreign Currency Gains on Translation Available-for- Unfunded Adjustment Sale Securities SERP Liability Total Balance at December 31, 2019 $ (20,032 ) $ 12 $ (4,045 ) $ (24,065 ) Other comprehensive loss before reclassifications (1,568 ) (1 ) (37 ) (1,606 ) Amount reclassified from accumulated other comprehensive loss - - 169 (a) 169 Net current period other comprehensive income (loss) (1,568 ) (1 ) 132 (1,437 ) Balance at June 30, 2020 $ (21,600 ) $ 11 $ (3,913 ) $ (25,502 ) (a) This reclassification relates to the amortization of prior service costs and gains/losses associated with the Company's SERP Plan. This expense is allocated between cost of sales and selling, general and administrative expense based upon the employment classification of the plan participants.

Note 13 - Commitments and Conti

Note 13 - Commitments and Contingencies	6 Months Ended
	Jun. 30, 2020
Notes to Financial Statements
Commitments and Contingencies Disclosure [Text Block]	13. COMMITMENTS AND CONTINGENCIES Legal Proceedings In connection with the acquisition of Power Solutions, there is an ongoing claim by the Arezzo Revenue Agency in Italy concerning certain tax matters related to what was then Power-One Asia Pacific Electronics Shenzhen Co. Ltd. (now Bel Power Solutions Asia Pacific Electronics Shenzhen Co. Ltd, or “BPS China”) for the years 2004 2006. September 2012, February 2013, October 2, 2014. October 13, 2014, July 18, 2015 December 5, 2016, January 4, 2017. June 30, 2020 December 31, 2019 The Company is not

Note 14 - Segments

Note 14 - Segments	6 Months Ended
	Jun. 30, 2020
Notes to Financial Statements
Segment Reporting Disclosure [Text Block]	14. SEGMENTS The Company operates in one three three Three Months Ended June 30, 2020 Cinch Connectivity Power Solutions Magnetic Corporate Solutions and Protection Solutions Segment Total Revenue $ 38,908 $ 45,112 $ 37,152 $ - 121,172 Gross Profit 11,531 10,615 9,445 178 31,769 Gross Profit % 29.6 % 23.5 % 25.4 % nm 26.2 % Three Months Ended June 30, 2019 Cinch Connectivity Power Solutions Magnetic Corporate Solutions and Protection Solutions Segment Total Revenue $ 42,536 $ 44,028 $ 40,852 $ - 127,416 Gross Profit 10,135 8,876 8,180 (445 ) 26,746 Gross Profit % 23.8 % 20.2 % 20.0 % nm 21.0 % Six Months Ended June 30, 2020 Cinch Connectivity Power Solutions Magnetic Corporate Solutions and Protection Solutions Segment Total Revenue $ 78,007 $ 81,289 $ 65,853 $ - 225,149 Gross Profit 22,698 19,523 15,438 (779 ) 56,880 Gross Profit % 29.1 % 24.0 % 23.4 % nm 25.3 % Six Months Ended June 30, 2019 Cinch Connectivity Power Solutions Magnetic Corporate Solutions and Protection Solutions Segment Total Revenue $ 86,897 $ 86,800 $ 79,108 $ - 252,805 Gross Profit 22,450 18,855 16,708 (533 ) 57,480 Gross Profit % 25.8 % 21.7 % 21.1 % nm 22.7 %

Significant Accounting Policies

Significant Accounting Policies (Policies)	6 Months Ended
	Jun. 30, 2020
Accounting Policies [Abstract]
Reclassification, Comparability Adjustment [Policy Text Block]	Reclassifications fourth 2019, three six June 30, 2019, fourth 2019, $0.5 three six June 30, 2019, fourth 2019. three 14 three six June 30, 2019 All amounts included in the tables to these notes to condensed consolidated financial statements, except per share amounts, are in thousands.
New Accounting Pronouncements, Policy [Policy Text Block]	Recently Adopted Accounting Standards In August 2018, 2018 13, Fair Value Measurement (Topic 820 December 15, 2019. January 1, 2020. not In August 2018, 2018 15, Intangibles – Goodwill and Other-Internal-Use Software (Subtopic 350 40 December 15, 2019. January 1, 2020 not Accounting Standards Issued But Not In June 2016, No. 2016 13, Financial Instruments – Credit Losses (Topic 326 2016 13” December 15, 2022, 2016 13, not In August 2018, 2018 14, Compensation-Retirement Benefits-Defined Benefit Plans-General (Subtopic 715 20 2018 14" not December 15, 2020. 2018 14 In December 2019, 2019 12, Simplifying the Accounting for Income Taxes ("ASU 2019 12" 740 2019 12 December 15, 2020. 2019 12, not

Note 2 - Acquisitions (Tables)

Note 2 - Acquisitions (Tables)	6 Months Ended
	Jun. 30, 2020
Notes Tables
Business Acquisition, Pro Forma Information [Table Text Block]	Three Months Ended Six Months Ended June 30, 2019 June 30, 2019 Revenue $ 135,847 $ 270,504 Net earnings 3,383 5,069 Earnings per Class A common share - basic and diluted 0.26 0.39 Earnings per Class B common share - basic and diluted 0.28 0.42

Note 3 - Revenue (Tables)

Note 3 - Revenue (Tables)	6 Months Ended
	Jun. 30, 2020
Notes Tables
Disaggregation of Revenue [Table Text Block]	Three Months Ended June 30, 2020 Six Months Ended June 30, 2020 Cinch Connectivity Solutions Power Solutions and Protection Magnetic Solutions Consolidated Cinch Connectivity Solutions Power Solutions and Protection Magnetic Solutions Consolidated By Product Group: North America $ 27,608 $ 29,029 $ 7,097 $ 63,734 $ 57,310 $ 51,752 $ 14,204 $ 123,266 Europe 8,356 8,965 1,717 19,038 16,118 18,279 2,918 37,315 Asia 2,944 7,118 28,338 38,400 4,579 11,258 48,731 64,568 $ 38,908 $ 45,112 $ 37,152 $ 121,172 $ 78,007 $ 81,289 $ 65,853 $ 225,149 By Sales Channel: Direct to customer $ 23,600 $ 26,894 $ 31,021 $ 81,515 $ 48,652 $ 48,471 $ 55,363 $ 152,486 Through distribution 15,308 18,218 6,131 39,657 29,355 32,818 10,490 72,663 $ 38,908 $ 45,112 $ 37,152 $ 121,172 $ 78,007 $ 81,289 $ 65,853 $ 225,149 Three Months Ended June 30, 2019 Six Months Ended June 30, 2019 Cinch Connectivity Solutions Power Solutions and Protection Magnetic Solutions Consolidated Cinch Connectivity Solutions Power Solutions and Protection Magnetic Solutions Consolidated By Product Group: North America $ 31,297 $ 26,131 $ 9,638 $ 67,066 $ 63,418 $ 49,652 $ 18,583 $ 131,653 Europe 8,212 10,768 2,046 21,026 16,977 23,307 4,267 44,551 Asia 3,027 7,129 29,168 39,324 6,502 13,841 56,258 76,601 $ 42,536 $ 44,028 $ 40,852 $ 127,416 $ 86,897 $ 86,800 $ 79,108 $ 252,805 By Sales Channel: Direct to customer $ 28,207 $ 28,594 $ 34,641 $ 91,442 $ 57,812 $ 57,694 $ 67,158 $ 182,664 Through distribution 14,329 15,434 6,211 35,974 29,085 29,106 11,950 70,141 $ 42,536 $ 44,028 $ 40,852 $ 127,416 $ 86,897 $ 86,800 $ 79,108 $ 252,805
Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block]	June 30, December 31, 2020 2019 Contract assets - current (unbilled receivable) $ 15,334 $ 16,318 Contract liabilities - current (deferred revenue) $ 1,148 $ 653

Note 4 - Earnings Per Share (Ta

Note 4 - Earnings Per Share (Tables)	6 Months Ended
	Jun. 30, 2020
Notes Tables
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]	Three Months Ended Six Months Ended June 30, June 30, 2020 2019 2020 2019 Numerator: Net earnings $ 5,573 $ 2,967 $ 1,769 $ 4,098 Less dividends declared: Class A 129 131 259 261 Class B 707 704 1,416 1,412 Undistributed earnings $ 4,737 $ 2,132 $ 94 $ 2,425 Undistributed earnings allocation - basic and diluted: Class A undistributed earnings $ 794 $ 363 $ 15 $ 412 Class B undistributed earnings 3,943 1,769 79 2,013 Total undistributed earnings $ 4,737 $ 2,132 $ 94 $ 2,425 Net earnings allocation - basic and diluted: Class A net earnings $ 923 $ 494 $ 274 $ 673 Class B net earnings 4,650 2,473 1,495 3,425 Net earnings $ 5,573 $ 2,967 $ 1,769 $ 4,098 Denominator: Weighted-average shares outstanding: Class A - basic and diluted 2,145 2,175 2,145 2,175 Class B - basic and diluted 10,178 10,112 10,151 10,100 Net earnings per share: Class A - basic and diluted $ 0.43 $ 0.23 $ 0.13 $ 0.31 Class B - basic and diluted $ 0.46 $ 0.24 $ 0.15 $ 0.34

Note 6 - Inventories (Tables)

Note 6 - Inventories (Tables)	6 Months Ended
	Jun. 30, 2020
Notes Tables
Schedule of Inventory, Current [Table Text Block]	June 30, December 31, 2020 2019 Raw materials $ 47,707 $ 47,936 Work in progress 29,139 27,065 Finished goods 27,880 32,275 Inventories $ 104,726 $ 107,276

Note 7 - Property, Plant and _2

Note 7 - Property, Plant and Equipment (Tables)	6 Months Ended
	Jun. 30, 2020
Notes Tables
Property, Plant and Equipment [Table Text Block]	June 30, December 31, 2020 2019 Land $ 1,428 $ 1,431 Buildings and improvements 22,647 29,722 Machinery and equipment 124,192 132,134 Construction in progress 2,662 5,090 150,929 168,377 Accumulated depreciation (113,595 ) (126,434 ) Property, plant and equipment, net $ 37,334 $ 41,943

Note 8 - Accrued Expenses (Tabl

Note 8 - Accrued Expenses (Tables)	6 Months Ended
	Jun. 30, 2020
Notes Tables
Schedule of Accrued Liabilities [Table Text Block]	June 30, December 31, 2020 2019 Sales commissions $ 2,685 $ 2,542 Subcontracting labor 1,115 990 Salaries, bonuses and related benefits 15,301 14,715 Warranty accrual 1,368 1,576 Other 7,933 7,095 $ 28,402 $ 26,918
Restructuring and Related Costs [Table Text Block]	Six Months Ended June 30, 2020 Liability at Cash Payments Liability at December 31, New and Other June 30, 2019 Charges Settlements 2020 Severance costs $ - $ 216 $ (216 ) $ - Other restructuring costs 44 (44 ) - - Total $ 44 $ 172 $ (216 ) $ -

Note 11 - Retirement Fund and_2

Note 11 - Retirement Fund and Profit Sharing Plan (Tables)	6 Months Ended
	Jun. 30, 2020
Notes Tables
Schedule of Net Benefit Costs [Table Text Block]	Three Months Ended Six Months Ended June 30, June 30, 2020 2019 2020 2019 Service cost $ 150 $ 144 $ 300 $ 288 Interest cost 159 185 318 370 Net amortization 86 48 172 96 Net periodic benefit cost $ 395 $ 377 $ 790 $ 754
Schedule of Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block]	June 30, December 31, 2020 2019 Prior service cost $ 662 $ 738 Net loss 1,870 1,965 $ 2,532 $ 2,703

Note 12 - Accumulated Other C_2

Note 12 - Accumulated Other Comprehensive Loss (Tables)	6 Months Ended
	Jun. 30, 2020
Notes Tables
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]	June 30, December 31, 2020 2019 Foreign currency translation adjustment, net of taxes of ($711) at June 30, 2020 and ($742) at December 31, 2019 $ (21,600 ) $ (20,032 ) Unrealized holding gains on available-for-sale securities, net of taxes of $0 at June 30, 2020 and $0 at December 31, 2019 11 12 Unfunded SERP liability, net of taxes of ($599) at June 30, 2020 and ($639) at December 31, 2019 (3,913 ) (4,045 ) Accumulated other comprehensive loss $ (25,502 ) $ (24,065 )
Schedule of Changes in Accumulated Other Comprehensive Income (Loss) by Component [Table Text Block]	Unrealized Holding Foreign Currency Gains on Translation Available-for- Unfunded Adjustment Sale Securities SERP Liability Total Balance at December 31, 2019 $ (20,032 ) $ 12 $ (4,045 ) $ (24,065 ) Other comprehensive loss before reclassifications (1,568 ) (1 ) (37 ) (1,606 ) Amount reclassified from accumulated other comprehensive loss - - 169 (a) 169 Net current period other comprehensive income (loss) (1,568 ) (1 ) 132 (1,437 ) Balance at June 30, 2020 $ (21,600 ) $ 11 $ (3,913 ) $ (25,502 )

Note 14 - Segments (Tables)

Note 14 - Segments (Tables)	6 Months Ended
	Jun. 30, 2020
Notes Tables
Schedule of Segment Reporting Information, by Segment [Table Text Block]	Three Months Ended June 30, 2020 Cinch Connectivity Power Solutions Magnetic Corporate Solutions and Protection Solutions Segment Total Revenue $ 38,908 $ 45,112 $ 37,152 $ - 121,172 Gross Profit 11,531 10,615 9,445 178 31,769 Gross Profit % 29.6 % 23.5 % 25.4 % nm 26.2 % Three Months Ended June 30, 2019 Cinch Connectivity Power Solutions Magnetic Corporate Solutions and Protection Solutions Segment Total Revenue $ 42,536 $ 44,028 $ 40,852 $ - 127,416 Gross Profit 10,135 8,876 8,180 (445 ) 26,746 Gross Profit % 23.8 % 20.2 % 20.0 % nm 21.0 % Six Months Ended June 30, 2020 Cinch Connectivity Power Solutions Magnetic Corporate Solutions and Protection Solutions Segment Total Revenue $ 78,007 $ 81,289 $ 65,853 $ - 225,149 Gross Profit 22,698 19,523 15,438 (779 ) 56,880 Gross Profit % 29.1 % 24.0 % 23.4 % nm 25.3 % Six Months Ended June 30, 2019 Cinch Connectivity Power Solutions Magnetic Corporate Solutions and Protection Solutions Segment Total Revenue $ 86,897 $ 86,800 $ 79,108 $ - 252,805 Gross Profit 22,450 18,855 16,708 (533 ) 57,480 Gross Profit % 25.8 % 21.7 % 21.1 % nm 22.7 %

Note 1 - Basis of Presentatio_2

Note 1 - Basis of Presentation and Accounting Policies (Details Textual) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Cost of Goods and Services Sold, Total	$ 89,403	$ 100,670	$ 168,269	$ 195,325
Research and Development Expense, Total	6,116	6,862	12,175	14,036
Selling, General and Administrative Expense, Total	18,061	19,215	40,122	38,440
Interest Income and Other Expense	$ (302)	267	$ (390)	(513)
Revision of Prior Period, Adjustment [Member]
Cost of Goods and Services Sold, Total		(6,900)		(14,000)
Research and Development Expense, Total		6,900		14,000
Selling, General and Administrative Expense, Total		500		(100)
Interest Income and Other Expense		$ (500)		$ 100

Note 2 - Acquisitions (Details

Note 2 - Acquisitions (Details Textual) - USD ($) $ in Thousands	Dec. 03, 2019	Dec. 31, 2019	Jun. 30, 2020	Jun. 30, 2020
Goodwill, Ending Balance		$ 21,993	$ 22,252	$ 22,252
Business Combination, Acquisition Related Costs			200	200
CUI Power [Member]
Revenue from Contract with Customer, Including Assessed Tax		$ 32,000
Majority Products Business of CUI Power [Member]
Payments to Acquire Businesses, Gross	$ 29,200
Goodwill, Ending Balance	$ 10,900
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual			10,600	18,900
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual			$ 2,300	$ 3,100

Note 2 - Acquisitions - Proform

Note 2 - Acquisitions - Proforma Results (Details) - Majority Products Business of CUI Power [Member] - USD ($)	3 Months Ended	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2020
Revenue	$ 135,847	$ 270,504
Net earnings	$ 3,383	$ 5,069
Common Class A [Member]
Earnings per common share - basic and diluted (in dollars per share)	$ 0.26	$ 0.39
Earnings per common share - basic and diluted (in dollars per share)	(0.26)	(0.39)
Common Class B [Member]
Earnings per common share - basic and diluted (in dollars per share)	(0.28)	(0.42)
Earnings per common share - basic and diluted (in dollars per share)	$ 0.28	$ 0.42

Note 3 - Revenue (Details Textu

Note 3 - Revenue (Details Textual) $ in Millions	Jun. 30, 2020USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-07-01
Revenue, Remaining Performance Obligation, Amount	$ 15.2
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period (Year)	6 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01
Revenue, Remaining Performance Obligation, Percentage	27.00%
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period (Year)	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01
Revenue, Remaining Performance Obligation, Percentage	70.00%
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period (Year)	1 year

Note 3 - Revenue - Disaggregati

Note 3 - Revenue - Disaggregation of Revenue by Product Group and Sales Channel (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenue	$ 121,172	$ 127,416	$ 225,149	$ 252,805
Sales Channel, Directly to Consumer [Member]
Revenue	81,515	91,442	152,486	182,664
Sales Channel, Through Intermediary [Member]
Revenue	39,657	35,974	72,663	70,141
Connectivity Solutions [Member]
Revenue	38,908	42,536	78,007	86,897
Connectivity Solutions [Member] | Sales Channel, Directly to Consumer [Member]
Revenue	23,600	28,207	48,652	57,812
Connectivity Solutions [Member] | Sales Channel, Through Intermediary [Member]
Revenue	15,308	14,329	29,355	29,085
Power Solutions and Protection [Member]
Revenue	45,112	44,028	81,289	86,800
Power Solutions and Protection [Member] | Sales Channel, Directly to Consumer [Member]
Revenue	26,894	28,594	48,471	57,694
Power Solutions and Protection [Member] | Sales Channel, Through Intermediary [Member]
Revenue	18,218	15,434	32,818	29,106
Magnetic Solutions [Member]
Revenue	37,152	40,852	65,853	79,108
Magnetic Solutions [Member] | Sales Channel, Directly to Consumer [Member]
Revenue	31,021	34,641	55,363	67,158
Magnetic Solutions [Member] | Sales Channel, Through Intermediary [Member]
Revenue	6,131	6,211	10,490	11,950
North America [Member]
Revenue	63,734	67,066	123,266	131,653
North America [Member] | Connectivity Solutions [Member]
Revenue	27,608	31,297	57,310	63,418
North America [Member] | Power Solutions and Protection [Member]
Revenue	29,029	26,131	51,752	49,652
North America [Member] | Magnetic Solutions [Member]
Revenue	7,097	9,638	14,204	18,583
Europe [Member]
Revenue	19,038	21,026	37,315	44,551
Europe [Member] | Connectivity Solutions [Member]
Revenue	8,356	8,212	16,118	16,977
Europe [Member] | Power Solutions and Protection [Member]
Revenue	8,965	10,768	18,279	23,307
Europe [Member] | Magnetic Solutions [Member]
Revenue	1,717	2,046	2,918	4,267
Asia [Member]
Revenue	38,400	39,324	64,568	76,601
Asia [Member] | Connectivity Solutions [Member]
Revenue	2,944	3,027	4,579	6,502
Asia [Member] | Power Solutions and Protection [Member]
Revenue	7,118	7,129	11,258	13,841
Asia [Member] | Magnetic Solutions [Member]
Revenue	$ 28,338	$ 29,168	$ 48,731	$ 56,258

Note 3 - Revenue - Contract Ass

Note 3 - Revenue - Contract Assets and Contract Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Contract assets - current (unbilled receivable)	$ 15,334	$ 16,318
Contract liabilities - current (deferred revenue)	$ 1,148	$ 653

Note 4 - Earnings Per Share - B

Note 4 - Earnings Per Share - Basic and Diluted Net Earnings Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019
Net earnings	$ 5,573	$ (3,804)	$ 2,967	$ 1,131	$ 1,769	$ 4,098
Undistributed earnings	4,737		2,132		94	2,425
Common Class A [Member]
Net earnings	923		494		274	673
Less dividends declared	129	130	131	130	259	261
Undistributed earnings	$ 794		$ 363		$ 15	$ 412
Weighted-average shares outstanding, basic and diluted (in shares)	2,145		2,175		2,145	2,175
Common shares - basic and diluted (in dollars per share)	$ 0.43		$ 0.23		$ 0.13	$ 0.31
Common Class B [Member]
Net earnings	$ 4,650		$ 2,473		$ 1,495	$ 3,425
Less dividends declared	707	$ 709	704	$ 708	1,416	1,412
Undistributed earnings	$ 3,943		$ 1,769		$ 79	$ 2,013
Weighted-average shares outstanding, basic and diluted (in shares)	10,178		10,112		10,151	10,100
Common shares - basic and diluted (in dollars per share)	$ 0.46		$ 0.24		$ 0.15	$ 0.34

Note 5 - Fair Value Measureme_2

Note 5 - Fair Value Measurements (Details Textual) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Long-term Debt, Fair Value	$ 141,700	$ 146,400
Long-term Debt, Gross	135,200	143,700
Fair Value, Nonrecurring [Member]
Assets, Fair Value Disclosure	0	0
Foreign Exchange Forward [Member] | Maximum [Member]
Derivative Asset, Total	100
Investments Held in Rabbi Trust [Member]
Debt Securities, Available-for-sale, Total	$ 900	$ 1,100

Note 6 - Inventories - Componen

Note 6 - Inventories - Components of Inventories (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Raw materials	$ 47,707	$ 47,936
Work in progress	29,139	27,065
Finished goods	27,880	32,275
Inventories	$ 104,726	$ 107,276

Note 7 - Property, Plant and _3

Note 7 - Property, Plant and Equipment (Details Textual) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Depreciation, Total	$ 2.3	$ 2.5	$ 4.7	$ 5

Note 7 - Property, Plant and _4

Note 7 - Property, Plant and Equipment - Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Property, plant and equipment, gross	$ 150,929	$ 168,377
Accumulated depreciation	(113,595)	(126,434)
Property, plant and equipment, net	37,334	41,943
Land [Member]
Property, plant and equipment, gross	1,428	1,431
Building and Building Improvements [Member]
Property, plant and equipment, gross	22,647	29,722
Machinery and Equipment [Member]
Property, plant and equipment, gross	124,192	132,134
Construction in Progress [Member]
Property, plant and equipment, gross	$ 2,662	$ 5,090

Note 8 - Accrued Expenses - Acc

Note 8 - Accrued Expenses - Accrued Expenses (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Sales commissions	$ 2,685	$ 2,542
Subcontracting labor	1,115	990
Salaries, bonuses and related benefits	15,301	14,715
Warranty accrual	1,368	1,576
Other	7,933	7,095
Accrued Liabilities, Current, Total	$ 28,402	$ 26,918

Note 8 - Accrued Expenses - Act

Note 8 - Accrued Expenses - Activity and Liability Balances Related to Restructuring Costs (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Dec. 31, 2019
Liability, beginning balance	$ 0	$ 44
New charges	172
Cash payment and other settlements	(216)
Liability, ending balance	0	(44)
Employee Severance [Member]
Liability, beginning balance	0	0
New charges	216
Cash payment and other settlements	(216)
Liability, ending balance	0	0
Other Restructuring [Member]
Liability, beginning balance	0	44
New charges	(44)
Cash payment and other settlements	0
Liability, ending balance	$ 0	$ (44)

Note 9 - Debt (Details Textual)

Note 9 - Debt (Details Textual) - USD ($) $ in Thousands	Feb. 18, 2020	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Repayments of Long-term Debt, Total				$ 8,179	$ 1,487
Credit and Security Agreement with KeyBank [Member]
Debt Issuance Costs, Net, Total		$ 1,600		$ 1,600		$ 1,300
Debt, Weighted Average Interest Rate		3.44%		3.44%		3.31%
Interest Expense, Debt, Total		$ 1,300	$ 1,400	$ 2,600	$ 2,800
Credit and Security Agreement with KeyBank [Member] | Term Loan [Member]
Repayments of Long-term Debt, Total	$ 8,200
Credit and Security Agreement with KeyBank [Member] | Revolving Credit Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity		75,000		75,000		$ 75,000
Long-term Line of Credit, Total		32,000		32,000		32,000
Credit and Security Agreement with KeyBank [Member] | Term Loan [Member]
Long-term Debt, Total		$ 104,800		$ 104,800		$ 113,000

Note 10 - Income Taxes (Details

Note 10 - Income Taxes (Details Textual) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2020	Dec. 31, 2019
Unrecognized Tax Benefits, Ending Balance	$ 28.4	$ 29.1
Liability for Uncertainty in Income Taxes, Current	1.3	$ 2.2
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense, Total	0.4
Tax Credit Carryforward, Amount	0.3
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total	$ 4.9

Note 11 - Retirement Fund and_3

Note 11 - Retirement Fund and Profit Sharing Plan (Details Textual) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Bel Fuse Inc. Employees' Savings Plan [Member]
Defined Contribution Plan, Cost	$ 0.3	$ 0.3	$ 0.6	$ 0.6
Bel Fuse Inc. Employees' Savings Plan [Member] | Common Class A [Member]
Shares Held in Plan (in shares)	223,406		223,406
Bel Fuse Inc. Employees' Savings Plan [Member] | Common Class B [Member]
Shares Held in Plan (in shares)	111,761		111,761
Retirement Fund Covering Hong Kong-based Employees [Member]
Defined Contribution Plan, Cost	$ 0.1	$ 0.1	$ 0.2	$ 0.2
Retirement Fund Covering Hong Kong-based Employees [Member] | Common Class A [Member]
Shares Held in Plan (in shares)	3,323		3,323
Retirement Fund Covering Hong Kong-based Employees [Member] | Common Class B [Member]
Shares Held in Plan (in shares)	17,342		17,342

Note 11 - Retirement Fund and_4

Note 11 - Retirement Fund and Profit Sharing Plan - Components of SERP Expense (Details) - Supplemental Employee Retirement Plan [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Service cost	$ 150	$ 144	$ 300	$ 288
Interest cost	159	185	318	370
Net amortization	86	48	172	96
Net periodic benefit cost	$ 395	$ 377	$ 790	$ 754

Note 11 - Retirement Fund and_5

Note 11 - Retirement Fund and Profit Sharing Plan - Amounts Recognized in Accumulated Other Comprehensive Loss (Details) - Supplemental Employee Retirement Plan [Member] - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Prior service cost	$ 662	$ 738
Net loss	1,870	1,965
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax, Total	$ 2,532	$ 2,703

Note 12 - Accumulated Other C_3

Note 12 - Accumulated Other Comprehensive Loss - Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Foreign currency translation adjustment, net of taxes of ($711) at June 30, 2020 and ($742) at December 31, 2019	$ (21,600)	$ (20,032)
Unrealized holding gains on available-for-sale securities, net of taxes of $0 at June 30, 2020 and $0 at December 31, 2019	11	12
Unfunded SERP liability, net of taxes of ($599) at June 30, 2020 and ($639) at December 31, 2019	(3,913)	(4,045)
Accumulated other comprehensive loss	$ (25,502)	$ (24,065)

Note 12 - Accumulated Other C_4

Note 12 - Accumulated Other Comprehensive Loss - Changes in Accumulated Other Comprehensive Loss by Component (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Balance		$ 161,832	$ 178,153	$ 168,051	$ 176,470
Other comprehensive income (loss)		742	(797)	(1,437)	(220)
Balance		167,928	180,276	167,928	180,276
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Balance				(20,032)
Other comprehensive loss before reclassifications				(1,568)
Amount reclassified from accumulated other comprehensive loss				0
Other comprehensive income (loss)				(1,568)
Balance		(21,600)		(21,600)
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member]
Balance				12
Other comprehensive loss before reclassifications				(1)
Amount reclassified from accumulated other comprehensive loss				0
Other comprehensive income (loss)				(1)
Balance		11		11
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Balance				(4,045)
Other comprehensive loss before reclassifications				(37)
Amount reclassified from accumulated other comprehensive loss	[1]			169
Other comprehensive income (loss)				132
Balance		(3,913)		(3,913)
AOCI Attributable to Parent [Member]
Balance		(26,244)	(24,724)	(24,065)	(24,838)
Other comprehensive loss before reclassifications				(1,606)
Amount reclassified from accumulated other comprehensive loss				169
Other comprehensive income (loss)				(1,437)
Balance		$ (25,502)	$ (25,521)	$ (25,502)	$ (25,521)
[1]	This reclassification relates to the amortization of prior service costs and gains/losses associated with the Company's SERP Plan. This expense is allocated between cost of sales and selling, general and administrative expense based upon the employment classification of the plan participants.

Note 13 - Commitments and Con_2

Note 13 - Commitments and Contingencies (Details Textual) $ in Millions	Jun. 30, 2020USD ($)
Arezzo Revenue Agency [Member]
Loss Contingency, Estimate of Possible Loss	$ 12

Note 14 - Segments (Details Tex

Note 14 - Segments (Details Textual)	6 Months Ended
	Jun. 30, 2020
Number of Industry in which Entity Operates	1
Number of Operating Segments	3
Number of Reportable Segments	3

Note 14 - Segments - Segments (

Note 14 - Segments - Segments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenue	$ 121,172	$ 127,416	$ 225,149	$ 252,805
Gross Profit	$ 31,769	$ 26,746	$ 56,880	$ 57,480
Gross Profit %	26.20%	21.00%	25.30%	22.70%
Connectivity Solutions [Member]
Revenue	$ 38,908	$ 42,536	$ 78,007	$ 86,897
Gross Profit	$ 11,531	$ 10,135	$ 22,698	$ 22,450
Gross Profit %	29.60%	23.80%	29.10%	25.80%
Power Solutions and Protection Segment [Member]
Revenue	$ 45,112	$ 44,028	$ 81,289	$ 86,800
Gross Profit	$ 10,615	$ 8,876	$ 19,523	$ 18,855
Gross Profit %	23.50%	20.20%	24.00%	21.70%
Magnetic Solutions Segment [Member]
Revenue	$ 37,152	$ 40,852	$ 65,853	$ 79,108
Gross Profit	$ 9,445	$ 8,180	$ 15,438	$ 16,708
Gross Profit %	25.40%	20.00%	23.40%	21.10%
Corporate Segment [Member]
Revenue	$ 0	$ 0	$ 0	$ 0
Gross Profit	$ 178	$ (445)	$ (779)	$ (533)