Natural Resource Partners (NRP) 10-Q 7 May 24 2024 Q1 Quarterly report Financial data

Document And Entity Information

Document And Entity Information - shares	3 Months Ended
	Mar. 31, 2024	May 07, 2024
Document Information [Line Items]
Entity Central Index Key	0001171486
Entity Registrant Name	NATURAL RESOURCE PARTNERS LP
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Document Fiscal Period Focus	Q1
Document Fiscal Year Focus	2024
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2024
Document Transition Report	false
Entity File Number	001-31465
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	35-2164875
Entity Address, Address Line One	1415 Louisiana Street, Suite 3325
Entity Address, City or Town	Houston
Entity Address, State or Province	TX
Entity Address, Postal Zip Code	77002
City Area Code	713
Local Phone Number	751-7507
Title of 12(b) Security	Common Units representing limited partner interests
Trading Symbol	NRP
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		12,960,064

Consolidated Balance Sheets (Cu

Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Current assets
Cash and cash equivalents	$ 10,990	$ 11,989
Accounts receivable, net	33,874	41,086
Other current assets, net	3,494	2,218
Total current assets	48,358	55,293
Land	24,008	24,008
Mineral rights, net	390,176	394,483
Intangible assets, net	13,340	13,682
Equity in unconsolidated investment	268,634	276,549
Long-term contract receivable, net	25,632	26,321
Other Assets, Noncurrent	8,034	7,540
Total assets	778,182	797,876
Current liabilities
Accounts payable	1,514	885
Accrued liabilities	5,064	12,987
Accrued interest	995	584
Current portion of deferred revenue	5,635	4,599
Current portion of long-term debt, net	14,202	30,785
Total current liabilities	27,410	49,840
Deferred revenue	38,348	38,356
Long-term debt, net	174,595	124,273
Other Liabilities, Noncurrent	6,305	7,172
Total liabilities	246,658	219,641
Commitments and contingencies (see Note 13)
Class A Convertible Preferred Units (71,666 issued and outstanding at March 31, 2024 and December 31, 2023 at $1,000 par value per unit; liquidation preference of $1,850 per unit at March 31, 2024 and December 31, 2023) (See Note 3)	47,181	47,181
Partners’ capital
Common unitholders’ interest (12,960,064 and 12,634,642 units issued and outstanding at March 31, 2024 and December 31, 2023, respectively)	474,095	503,076
General partner’s interest	7,721	8,005
Warrants and Rights Outstanding	4,804	23,095
Accumulated other comprehensive loss	(2,277)	(3,122)
Total partners’ capital	484,343	531,054
Total liabilities and partners' capital	$ 778,182	$ 797,876

Consolidated Balance Sheets (_2

Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - $ / shares	Mar. 31, 2024	Dec. 31, 2023
Temporary Equity, shares issued (in shares)	71,666	71,666
Temporary Equity, shares outstanding (in shares)	71,666	71,666
Temporary Equity, par value (in dollars per share)	$ 1,000	$ 1,000
Temporary Equity, liquidation (in dollars per share)	$ 1,850	$ 1,850
Common unitholders interest, issued (in shares)	12,960,064	12,634,642
Common unitholders interest, outstanding (in shares)	12,960,064	12,634,642

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024		Mar. 31, 2023
Revenues and other income
Equity in earnings of Sisecam Wyoming	$ 5,450		$ 19,254
Gain on asset sales and disposals	165		96
Total revenues and other income	76,414		99,219
Operating expenses
Operating and maintenance expenses	5,733		7,163
Depreciation, depletion and amortization	4,654		4,083
General and administrative expenses	6,327		5,845
Total operating expenses	16,714		17,091
Income from operations	59,700		82,128
Interest expense, net	(3,487)		(2,853)
Net income	56,213	[1]	79,275	[2]
Less: income attributable to preferred unitholders	(2,150)		(6,661)
Less: redemption of preferred units	0		(16,228)
Net income attributable to common unitholders and the general partner	54,063		56,386
Net income attributable to common unitholders	52,982		55,258
Net income attributable to the general partner	$ 1,081		$ 1,128
Net income per common unit (see Note 5)
Basic (in dollars per share)	$ 4.13		$ 4.4
Diluted (in dollars per share)	$ 3.83		$ 3.44
Net income	$ 56,213	[1]	$ 79,275	[2]
Comprehensive income (loss) from unconsolidated investment and other	845		(19,583)
Comprehensive income	57,058		59,692
Royalty and Other Mineral Rights [Member] | Mineral Rights Segment [Member]
Revenues and other income
Revenues	67,372		76,271
Transportation and Processing Services [Member] | Mineral Rights Segment [Member]
Revenues and other income
Revenues	$ 3,427		$ 3,598
[1]Net income includes $2.15 million of income attributable to preferred unitholders that accumulated during the period, of which $2.11 million is allocated to the common unitholders and $0.04 million is allocated to the general partner.[2]Net income includes $6.66 million of income attributable to preferred unitholders that accumulated during the period, of which $6.53 million is allocated to the common unitholders and $0.13 million is allocated to the general partner.

Consolidated Statements of Part

Consolidated Statements of Partners' Capital (Unaudited) - USD ($) shares in Thousands, $ in Thousands		Total	AOCI Attributable to Parent [Member]	Limited Partner [Member]	General Partner [Member]	Warrant Holder [Member]
Balance (in shares) at Dec. 31, 2022				12,506
Balance at Dec. 31, 2022		$ 477,457	$ 18,717	$ 404,799	$ 5,977	$ 47,964
Net income	[1]	79,275		77,690	1,585
Distributions to common unitholders and the general partner		(40,900)		(40,082)	(818)
Distributions to preferred unitholders		(8,086)		$ (7,924)	(162)
Issuance of unit-based awards (in shares)				129
Unit-based awards amortization and vesting, net		(1,178)		$ (1,178)
Capital contribution		142			142
Comprehensive income from unconsolidated investment and other		(19,583)	(19,583)	0	0	0
Redemption of preferred units		(16,228)	0	$ (15,904)	(324)	0
Balance (in shares) at Mar. 31, 2023				12,635
Balance at Mar. 31, 2023		470,899	(866)	$ 417,401	6,400	47,964
Balance (in shares) at Dec. 31, 2023				12,635
Balance at Dec. 31, 2023		531,054	(3,122)	$ 503,076	8,005	23,095
Net income	[2]	56,213		55,089	1,124
Distributions to common unitholders and the general partner		(42,186)		(41,342)	(844)
Distributions to preferred unitholders		(2,150)		$ (2,107)	(43)
Issuance of unit-based awards (in shares)				126
Unit-based awards amortization and vesting, net		(3,971)		$ (3,971)
Capital contribution		227			227
Warrant settlements (in shares)				199
Warrant settlements		(55,689)		$ (36,650)	(748)	(18,291)
Comprehensive income from unconsolidated investment and other		845	845
Balance (in shares) at Mar. 31, 2024				12,960
Balance at Mar. 31, 2024		$ 484,343	$ (2,277)	$ 474,095	$ 7,721	$ 4,804
[1]Net income includes $6.66 million of income attributable to preferred unitholders that accumulated during the period, of which $6.53 million is allocated to the common unitholders and $0.13 million is allocated to the general partner.[2]Net income includes $2.15 million of income attributable to preferred unitholders that accumulated during the period, of which $2.11 million is allocated to the common unitholders and $0.04 million is allocated to the general partner.

Consolidated Statements of Cash

Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024		Mar. 31, 2023
Cash flows from operating activities
Net income	$ 56,213	[1]	$ 79,275	[2]
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion and amortization	4,654		4,083
Distributions from unconsolidated investment	14,210		10,780
Equity earnings from unconsolidated investment	(5,450)		(19,254)
Gain on asset sales and disposals	(165)		(96)
Bad debt expense	(813)		(610)
Unit-based compensation expense	2,964		2,491
Amortization of debt issuance costs and other	(749)		25
Change in operating assets and liabilities:
Accounts receivable	9,433		7,061
Accounts payable	629		(541)
Accrued liabilities	(8,225)		(8,805)
Accrued interest	412		263
Deferred revenue	1,028		(154)
Other items, net	(2,642)		(1,618)
Net cash provided by operating activities	71,499		72,900
Cash flows from investing activities
Proceeds from asset sales and disposals	165		101
Return of long-term contract receivable	647		598
Capital expenditures	0		(2)
Net cash provided by investing activities	812		697
Cash flows from financing activities
Debt borrowings	89,357		94,200
Debt repayments	(55,696)		(89,696)
Redemption of preferred units	0		(47,499)
Warrant settlements (see Note 3)	(55,689)		0
Other items, net	(6,946)		(3,052)
Net cash used in financing activities	(73,310)		(95,033)
Net decrease in cash and cash equivalents	(999)		(21,436)
Cash and cash equivalents at beginning of period	11,989		39,091
Cash and cash equivalents at end of period	10,990		17,655
Supplemental cash flow information:
Cash paid for interest	2,843		2,474
Common Unitholders And General Partner [Member]
Cash flows from financing activities
Distributions to unitholders	(42,186)		(40,900)
Preferred Partner [Member]
Cash flows from financing activities
Distributions to unitholders	$ (2,150)		$ (8,086)
[1]Net income includes $2.15 million of income attributable to preferred unitholders that accumulated during the period, of which $2.11 million is allocated to the common unitholders and $0.04 million is allocated to the general partner.[2]Net income includes $6.66 million of income attributable to preferred unitholders that accumulated during the period, of which $6.53 million is allocated to the common unitholders and $0.13 million is allocated to the general partner.

Note 1 - Basis of Presentation

Note 1 - Basis of Presentation	3 Months Ended
	Mar. 31, 2024
Notes to Financial Statements
Basis of Presentation and Significant Accounting Policies [Text Block]	1. Basis of Presentation Nature of Business Natural Resource Partners L.P. (the "Partnership") engages principally in the business of owning, managing and leasing a diversified portfolio of mineral properties in the United States, including interests in coal and other natural resources and owns a non-controlling 49% interest in Sisecam Wyoming LLC ("Sisecam Wyoming"), a trona ore mining and soda ash production business. The Partnership is organized into two operating segments further described in Note 6. Principles of Consolidation and Reporting The accompanying unaudited Consolidated Financial Statements of the Partnership have been prepared in accordance with generally accepted accounting principles in the United States of America ("GAAP") for interim financial information and with Rule 10 01 X. not December 31, 2023 10 March 7, 2024. no Recently Issued Accounting Standard In November 2023, ASU No. 2023 07—Segment 280 2023 07" 2023 07 December 15, 2023 December 15, 2024 not 2023 07

Note 2 - Revenues From Contract

Note 2 - Revenues From Contracts With Customers	3 Months Ended
	Mar. 31, 2024
Notes to Financial Statements
Revenue from Contract with Customer [Text Block]	2. Revenues from Contracts with Customers The following table presents the Partnership's Mineral Rights segment revenues from contracts with customers by major source: For the Three Months Ended March 31, (In thousands) 2024 2023 Coal royalty revenues $ 46,818 $ 58,023 Production lease minimum revenues 924 613 Minimum lease straight-line revenues 4,171 4,503 Carbon neutral initiative revenues 2,161 2,118 Property tax revenues 1,892 1,470 Wheelage revenues 2,672 3,869 Coal overriding royalty revenues 1,169 188 Lease amendment revenues 702 851 Aggregates royalty revenues 772 753 Oil and gas royalty revenues 3,640 3,588 Other revenues 653 295 Royalty and other mineral rights revenues $ 65,574 $ 76,271 Transportation and processing services revenues 2,836 2,933 Total Mineral Rights segment revenues from contracts with customers $ 68,410 $ 79,204 The following table details the Partnership's Mineral Rights segment receivables and liabilities resulting from contracts with customers: March 31, December 31, (In thousands) 2024 2023 Receivables Accounts receivable, net $ 29,978 $ 37,206 Other current assets, net (1) 2,221 429 Contract liabilities Current portion of deferred revenue $ 5,635 $ 4,599 Deferred revenue 38,348 38,356 ( 1 Other current assets, net includes short-term notes receivables from contracts with customers. The following table shows the activity related to the Partnership's Mineral Rights segment deferred revenue: For the Three Months Ended March 31, (In thousands) 2024 2023 Balance at beginning of period (current and non-current) $ 42,955 $ 46,437 Increase due to minimums and lease amendment fees 6,979 7,770 Recognition of previously deferred revenue (5,951 ) (7,924 ) Balance at end of period (current and non-current) $ 43,983 $ 46,283 The Partnership's non-cancelable annual minimum payments due under the lease terms of its coal and aggregates royalty leases are as follows as of March 31, 2024 Lease Term (1) Weighted Average Remaining Years Annual Minimum Payments 0 - 5 years 1.9 $ 17,362 5 - 10 years 6.3 17,237 10+ years 11.8 25,779 Total 7.4 $ 60,378 ( 1 Lease term does not

Note 3 - Class A Convertible Pr

Note 3 - Class A Convertible Preferred Units and Warrants	3 Months Ended
	Mar. 31, 2024
Notes to Financial Statements
Preferred Stock [Text Block]	3. On March 2, 2017, one may NRP also issued two may eighth may, first 2024 none April 18, 2024. After March 2, 2022 March 2, 2025, may 12 30 30 On or after March 2, 2025, may 30 1 March 2, 2020, March 2, 2020 March 2, 2021, March 2, 2021, 2 To the extent the holders of the preferred units have not March 2, 2029, 30 In addition, NRP has the ability to redeem at any time (subject to compliance with its debt agreements) all or any portion of the preferred units and any outstanding PIK units for cash. The redemption price for each outstanding PIK unit is $1,000 plus the value of any accrued and unpaid distributions per PIK unit. The redemption price for each preferred unit is the liquidation value divided by the number of outstanding preferred units. The preferred units are redeemable at the option of the preferred purchasers only upon a change in control. The terms of the preferred units contain certain restrictions on NRP's ability to pay distributions on its common units. To the extent that either (i) NRP's consolidated Leverage Ratio, as defined in the Partnership's Fifth Amended and Restated Partnership Agreement dated March 2, 2017 ( 3.25x, 1.2x four may not January 1, 2022, may not The holders of the preferred units have the right to vote with holders of NRP’s common units on an as-converted basis and have other customary approval rights with respect to changes of the terms of the preferred units. In addition, pursuant to the Restated Partnership Agreement, Blackstone had certain approval rights over certain matters as identified in the Restated Partnership Agreement. GoldenTree has limited approval rights that expanded when Blackstone's ownership fell below the minimum preferred unit threshold (as defined below). These approval rights are not no not At the closing, pursuant to the Board Rights Agreement, the Preferred Purchasers received certain board appointment and observation rights, and Blackstone appointed one one 2023, no not one 30 no no NRP also entered into a registration rights agreement (the "preferred unit and warrant registration rights agreement") with the preferred purchasers, pursuant to which NRP is required to file (i) a shelf registration statement to register the common units issuable upon exercise of the warrants and to cause such registration statement to become effective not 90 not fifth 90 first April 20, 2017. February 11, 2022. Accounting for the Preferred Units and Warrants Classification The preferred units are accounted for as temporary equity on NRP's Consolidated Balance Sheets due to certain contingent redemption rights that may Initial Measurement The net transaction price was allocated to the preferred units and warrants based on their relative fair values at inception date. NRP allocated the transaction issuance costs to the preferred units and warrants primarily on a pro-rata basis based on their relative inception date allocated values. Subsequent Measurement Preferred Units Subsequent adjustment of the preferred units will not first During the three March 31, 2023, March 31, 2024 December 31, 2023. March 31, 2024 December 31, 2023. Warrants Subsequent adjustment of the warrants will not may, During the three March 31, 2024, January 29, 2024 ( "January 2024 15 January 2024 February 7, 2024 "February 7, 2024 15 February 7, 2024 February 8, 2024 ( "February 8, 2024 15 February 8, 2024 February 14, 2024 "February 14, 2024 15 February 14, 2024 March 31, 2024 December 31, 2023, March 31, 2024 December 31, 2023, first 2024, none April 18, 2024. Note 17. Embedded Features Certain embedded features within the preferred unit and warrant purchase agreement are accounted for at fair value and are remeasured each quarter. See Note 10.

Note 4 - Common and Preferred U

Note 4 - Common and Preferred Unit Distributions	3 Months Ended
	Mar. 31, 2024
Notes to Financial Statements
Partners' Capital Notes Disclosure [Text Block]	4. Common and Preferred Unit Distributions The Partnership makes cash distributions to common and preferred unitholders on a quarterly basis, subject to approval by the Board of Directors of GP Natural Resource Partners LLC (the "Board of Directors"). NRP recognizes both common unit and preferred unit distributions on the date the distribution is declared. Distributions made on the common units and the general partner's general partner ("GP") interest are made on a pro-rata basis in accordance with their relative percentage interests in the Partnership. The general partner is entitled to receive 2% of such distributions. Income available to common unitholders and the general partner is reduced by preferred unit distributions that accumulated during the period. NRP reduced net income available to common unitholders and the general partner by $2.2 million and $6.7 million during the three March 31, 2024 2023 three March 31, 2023, February 2023 February 2023. three March 31, 2023. The following table shows the cash distributions declared and paid to common and preferred unitholders during the three March 31, 2024 2023 Common Units Preferred Units Month Paid Period Covered by Distribution Distribution per Unit Total Distribution (1) Distribution per Unit Total Distribution (In thousands) 2024 February October 1 - December 31, 2023 $ 0.75 $ 9,918 $ 30.00 $ 2,150 March (2) Special Distribution 2.44 32,268 — — 2023 February October 1 - December 31, 2022 $ 0.75 $ 9,571 $ 30.00 $ 7,500 February (3) January 1 - February 8, 2023 — — 12.33 586 March (4) Special Distribution 2.43 31,329 — — ( 1 Totals include the amount paid to NRP's general partner in accordance with the general partner's 2% ( 2 Special distribution was made to help cover unitholder tax liabilities associated with owning NRP's common units during 2023. ( 3 Relates to accrued distribution paid upon the redemption of 47,499 preferred units in February 2023. ( 4 Special distribution was made to help cover unitholder tax liabilities associated with owning NRP's common units during 2022.

Note 5 - Net Income Per Common

Note 5 - Net Income Per Common Unit	3 Months Ended
	Mar. 31, 2024
Notes to Financial Statements
Earnings Per Share [Text Block]	5. Net Income Per Common Unit Basic net income per common unit is computed by dividing net income, after considering income attributable to preferred unitholders, the difference between the fair value of the consideration paid upon redemption and the carrying value of the preferred units, and the general partner’s general partner interest, by the weighted average number of common units outstanding. Diluted net income per common unit includes the effect of NRP's preferred units, warrants, and unvested unit-based awards if the inclusion of these items is dilutive. The dilutive effect of the preferred units is calculated using the if-converted method. Under the if-converted method, the preferred units are assumed to be converted at the beginning of the period, and the resulting common units are included in the denominator of the diluted net income per unit calculation for the period being presented. Distributions declared in the period and undeclared distributions on the preferred units that accumulated during the period are added back to the numerator for purposes of the if-converted calculation. The calculation of diluted net income per common unit for the three March 31, 2024 2023 three March 31, 2023 not three March 31, 2023 The dilutive effect of the warrants is calculated using the treasury stock method, which assumes that the proceeds from the exercise of these instruments are used to purchase common units at the average market price for the period. The calculation of diluted net income per common unit for the three March 31, 2024 three March 31, 2023 $34.00. The following table reconciles the numerator and denominator of the basic and diluted net income per common unit computations and calculates basic and diluted net income per common unit: For the Three Months Ended March 31, (In thousands, except per unit data) 2024 2023 Basic net income per common unit Net income attributable to common unitholders $ 52,982 $ 55,258 Weighted average common units—basic 12,832 12,570 Basic net income per common unit $ 4.13 $ 4.40 Diluted net income per common unit Weighted average common units—basic 12,832 12,570 Plus: dilutive effect of preferred units 775 3,778 Plus: dilutive effect of warrants 521 1,255 Plus: dilutive effect of unvested unit-based awards 265 209 Weighted average common units—diluted 14,393 17,812 Net income $ 56,213 $ 79,275 Less: income attributable to preferred unitholders — (586 ) Less: redemption of preferred units — (16,228 ) Diluted net income attributable to common unitholders and the general partner $ 56,213 $ 62,461 Less: diluted net income attributable to the general partner (1,124 ) (1,249 ) Diluted net income attributable to common unitholders $ 55,089 $ 61,212 Diluted net income per common unit $ 3.83 $ 3.44

Note 6 - Segment Information

Note 6 - Segment Information	3 Months Ended
	Mar. 31, 2024
Notes to Financial Statements
Segment Reporting Disclosure [Text Block]	6. Segment Information The Partnership's segments are strategic business units that offer distinct products and services to different customers in different geographies within the U.S. and that are managed accordingly. NRP has the following two Mineral Rights Soda Ash Direct segment costs and certain other costs incurred at the corporate level that are identifiable and that benefit the Partnership's segments are allocated to the operating segments accordingly. These allocated costs generally include salaries and benefits, insurance, property taxes, legal, royalty, information technology and shared facilities services and are included in operating and maintenance expenses on the Partnership's Consolidated Statements of Comprehensive Income. Corporate and Financing includes functional corporate departments that do not not The following table summarizes certain financial information for each of the Partnership's business segments: Operating Segments (In thousands) Mineral Rights Soda Ash Corporate and Financing Total For the Three Months Ended March 31, 2024 Revenues $ 70,799 $ 5,450 $ — $ 76,249 Gain on asset sales and disposals 165 — — 165 Operating and maintenance expenses 5,671 62 — 5,733 Depreciation, depletion and amortization 4,649 — 5 4,654 General and administrative expenses — — 6,327 6,327 Interest expense, net — — 3,487 3,487 Net income (loss) 60,644 5,388 (9,819 ) 56,213 For the Three Months Ended March 31, 2023 Revenues $ 79,869 $ 19,254 $ — $ 99,123 Gain on asset sales and disposals 96 — — 96 Operating and maintenance expenses 7,005 158 — 7,163 Depreciation, depletion and amortization 4,079 — 4 4,083 General and administrative expenses — — 5,845 5,845 Interest expense, net — — 2,853 2,853 Net income (loss) 68,881 19,096 (8,702 ) 79,275

Note 7 - Equity Investment

Note 7 - Equity Investment	3 Months Ended
	Mar. 31, 2024
Notes to Financial Statements
Equity Method Investments and Joint Ventures Disclosure [Text Block]	7. Equity Investment The Partnership accounts for its 49% investment in Sisecam Wyoming using the equity method of accounting. Activity related to this investment is as follows: For the Three Months Ended March 31, (In thousands) 2024 2023 Balance at beginning of period $ 276,549 $ 306,470 Income allocation to NRP’s equity interests (1) 6,646 20,364 Amortization of basis difference (1,196 ) (1,110 ) Other comprehensive income (loss) 845 (19,583 ) Distributions (14,210 ) (10,780 ) Balance at end of period $ 268,634 $ 295,361 ( 1 Amounts reclassified into income out of accumulated other comprehensive loss were $1.6 million and $(20.6) million for the three March 31, 2024 2023, The following table represents summarized financial information for Sisecam Wyoming as derived from their respective unaudited financial statements for the three March 31, 2024 2023 For the Three Months Ended March 31, (In thousands) 2024 2023 Net sales $ 130,431 $ 207,128 Gross profit 21,133 49,055 Net income 13,563 41,560

Note 8 - Mineral Rights, Net

Note 8 - Mineral Rights, Net	3 Months Ended
	Mar. 31, 2024
Notes to Financial Statements
Mineral Industries Disclosures [Text Block]	8. Mineral Rights, Net The Partnership’s mineral rights consist of the following: March 31, 2024 December 31, 2023 (In thousands) Carrying Value Accumulated Depletion Net Book Value Carrying Value Accumulated Depletion Net Book Value Coal properties $ 661,256 $ (289,570 ) $ 371,686 $ 661,256 $ (285,470 ) $ 375,786 Aggregates properties 8,655 (3,848 ) 4,807 8,655 (3,761 ) 4,894 Oil and gas royalty properties 12,354 (10,203 ) 2,151 12,354 (10,082 ) 2,272 Other 13,143 (1,611 ) 11,532 13,143 (1,612 ) 11,531 Total mineral rights, net $ 695,408 $ (305,232 ) $ 390,176 $ 695,408 $ (300,925 ) $ 394,483 Depletion expense related to the Partnership’s mineral rights is included in depreciation, depletion and amortization on its Consolidated Statements of Comprehensive Income and totaled $4.3 million and $3.9 million for the three March 31, 2024 2023, The Partnership has developed procedures to evaluate its long-lived assets for possible impairment periodically or whenever events or changes in circumstances indicate an asset's net book value may not not no three March 31, 2024 2023.

Note 9 - Debt, Net

Note 9 - Debt, Net	3 Months Ended
	Mar. 31, 2024
Notes to Financial Statements
Debt Disclosure [Text Block]	9. Debt, Net The Partnership's debt consists of the following: March 31, December 31, (In thousands) 2024 2023 Opco Credit Facility $ 146,191 $ 95,834 Opco Senior Notes 5.82 $ — $ 12,685 8.92 — 4,012 5.03 34,262 34,262 5.18 8,732 8,732 Total Opco Senior Notes $ 42,994 $ 59,691 Total debt at face value $ 189,185 $ 155,525 Net unamortized debt issuance costs (388 ) (467 ) Total debt, net $ 188,797 $ 155,058 Less: current portion of long-term debt (14,202 ) (30,785 ) Total long-term debt, net $ 174,595 $ 124,273 Opco Debt All of Opco’s debt is guaranteed by its wholly owned subsidiaries and is secured by certain of the assets of Opco and its wholly owned subsidiaries, other than BRP LLC and NRP Trona LLC. As of March 31, 2024 December 31, 2023 Opco Credit Facility In May 2023, August 2027. February 2024, • A leverage ratio of consolidated indebtedness to EBITDDA (in each case as defined in the Opco Credit Facility) not 3.0x; • an interest coverage ratio of consolidated EBITDDA to the sum of consolidated interest expense and consolidated lease expense (in each case as defined in the Opco Credit Facility) of not 1.0. As of December 31, 2023, three March 31, 2024, March 31, 2024. three March 31, 2023, three March 31, 2024 2023 The Opco Credit Facility is collateralized and secured by liens on certain of Opco’s assets with carrying values of $312.4 million and $ March 31, 2024 December 31, 2023 Opco Senior Notes Opco has issued several series of private placement senior notes (the "Opco Senior Notes") with various interest rates and principal due dates. As of March 31, 2024 December 31, 2023 three March 31, 2024 2023

Note 10 - Fair Value Measuremen

Note 10 - Fair Value Measurements	3 Months Ended
	Mar. 31, 2024
Notes to Financial Statements
Fair Value Disclosures [Text Block]	10. Fair Value Measurements Fair Value of Financial Assets and Liabilities The Partnership’s financial assets and liabilities consist of cash and cash equivalents, a contract receivable and debt. The carrying amounts reported on the Consolidated Balance Sheets for cash and cash equivalents approximate fair value due to their short-term nature. The Partnership uses available market data and valuation methodologies to estimate the fair value of its debt and contract receivable. The following table shows the carrying value and estimated fair value of the Partnership's debt and contract receivable: March 31, 2024 December 31, 2023 Fair Value Carrying Estimated Carrying Estimated (In thousands) Hierarchy Level Value Fair Value Value Fair Value Debt: Opco Senior Notes (1) 3 $ 42,606 $ 39,971 $ 59,224 $ 56,533 Opco Credit Facility (2) 3 146,191 146,191 95,834 95,384 Assets: Contract receivable, net (current and long-term) (3) 3 $ 28,309 $ 24,071 $ 28,946 $ 24,492 ( 1 The fair value of the Opco Senior Notes was estimated by management utilizing the present value replacement method incorporating the interest rate of the Opco Credit Facility. ( 2 The fair value of the Opco Credit Facility approximates the outstanding borrowing amount because the interest rates are variable and reflective of market rates and the terms of the credit facility allow the Partnership to repay the debt at any time without penalty. ( 3 The fair value of the Partnership's contract receivable is determined based on the present value of future cash flow projections related to the underlying asset at a discount rate of 15% at March 31, 2024 December 31, 2023 NRP has embedded derivatives in the preferred units related to certain conversion options, redemption features and the change of control provision that are accounted for separately from the preferred units as assets and liabilities at fair value on the Partnership's Consolidated Balance Sheets. Level 3 zero March 31, 2024 December 31, 2023

Note 11 - Related Party Transac

Note 11 - Related Party Transactions - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
Assets [Abstract]
Other Assets, Noncurrent	$ 8,034	$ 7,540
Liabilities [Abstract]
Other Liabilities, Noncurrent	$ 6,305	$ 7,172
Notes to Financial Statements
Related Party Transactions Disclosure [Text Block]	11. Related Party Transactions Affiliates of our General Partner The Partnership’s general partner does not Direct general and administrative expenses charged to the Partnership by QMC, WPPLP and QID are included on the Partnership's Consolidated Statement of Comprehensive Income as follows: For the Three Months Ended March 31, (In thousands) 2024 2023 Operating and maintenance expenses $ 1,766 $ 1,719 General and administrative expenses 1,303 1,320 The Partnership had accounts payable to QMC of $0.4 million on its Consolidated Balance Sheets at both March 31, 2024 December 31, 2023 $0.4 March 31, 2024 December 31, 2023 As a result of its office lease with WPPLP, the Partnership has a right-of-use asset and lease liability of $3.5 other long-term assets other non-current liabilities March 31, 2024 December 31, 2023. During the three March 31, 2024 2023 gnized million and

Note 12 - Major Customers

Note 12 - Major Customers	3 Months Ended
	Mar. 31, 2024
Notes to Financial Statements
Concentration Risk Disclosure [Text Block]	12. Major Customers Revenues from customers that exceeded 10 For the Three Months Ended March 31, 2024 2023 (In thousands) Revenues Percent Revenues Percent Alpha Metallurgical Resources, Inc. (1) $ 20,902 27 % $ 24,218 24 % Foresight Energy Resources LLC ("Foresight") (1) $ 12,846 17 % $ 12,529 13 % ( 1 Revenues from Alpha Metallurgical Resources, Inc. and Foresight are included within the Partnership's Mineral Rights segment.

Note 13 - Commitments and Conti

Note 13 - Commitments and Contingencies	3 Months Ended
	Mar. 31, 2024
Notes to Financial Statements
Commitments and Contingencies Disclosure [Text Block]	13. Commitments and Contingencies NRP is involved, from time to time, in various legal proceedings arising in the ordinary course of business. While the ultimate results of these proceedings cannot be predicted with certainty, Partnership management believes these ordinary course matters will not

Note 14 - Unit-based Compensati

Note 14 - Unit-based Compensation	3 Months Ended
	Mar. 31, 2024
Notes to Financial Statements
Share-Based Payment Arrangement [Text Block]	14. Unit-Based Compensation During the three March 31, 2024 2023, 2017 three March 31, 2024 2023 three March 31, 2024 2023, three March 31, 2024 2023, March 31, 2024 December 31, 2023 A summary of the unit activity in the outstanding grants during 2024 (In thousands) Common Units Weighted Average Grant Date Fair Value per Common Unit Outstanding at January 1, 2024 483 $ 46.21 Granted 65 $ 103.50 Fully vested and issued (197 ) $ 38.76 Outstanding at March 31, 2024 351 $ 60.91

Note 15 - Financing Transaction

Note 15 - Financing Transaction	3 Months Ended
	Mar. 31, 2024
Notes to Financial Statements
Financing Receivables [Text Block]	15. Financing Transaction The Partnership owns rail loadout and associated infrastructure at the Sugar Camp mine in the Illinois Basin operated by a subsidiary of Foresight. The infrastructure at the Sugar Camp mine is leased to a subsidiary of Foresight and is accounted for as a financing transaction (the "Sugar Camp lease"). The Sugar Camp lease expires in 2032 $5.0 2032, ten thousand

Note 16 - Credit Losses

Note 16 - Credit Losses	3 Months Ended
	Mar. 31, 2024
Notes to Financial Statements
Credit Loss, Financial Instrument [Text Block]	16. Credit Losses The Partnership is exposed to credit losses through collection of its short-term trade receivables resulting from contracts with customers and a long-term receivable resulting from a financing transaction with a customer. The Partnership records an allowance for current expected credit losses on these receivables based on the loss-rate method. NRP assessed the likelihood of collection of its receivables utilizing historical loss rates, current market conditions, industry and macroeconomic factors, reasonable and supportable forecasts and facts or circumstances of individual customers and properties. Examples of these facts or circumstances include, but are not As of March 31, 2024 December 31, 2023 March 31, 2024 December 31, 2023 (In thousands) Gross CECL Allowance Net Gross CECL Allowance Net Receivables $ 40,992 $ (4,896 ) $ 36,096 $ 47,170 $ (5,655 ) $ 41,515 Long-term contract receivable 26,552 (920 ) 25,632 27,265 (944 ) 26,321 Total $ 67,544 $ (5,816 ) $ 61,728 $ 74,435 $ (6,599 ) $ 67,836 NRP recorded reversals of $0.8 million and $0.6 million of operating and maintenance expenses on its Consolidated Statements of Comprehensive Income related to the change in the CECL allowance during the three March 31, 2024 2023, NRP has procedures in place to monitor its ongoing credit exposure through timely review of counterparty balances against contract terms and due dates, account and financing receivable reconciliation, bankruptcy monitoring, lessee audits and dispute resolution. The Partnership may

Note 17 - Subsequent Events

Note 17 - Subsequent Events	3 Months Ended
	Mar. 31, 2024
Notes to Financial Statements
Subsequent Events [Text Block]	17. Subsequent Events The following represents material events that have occurred subsequent to March 31, 2024 10 Common Unit and Preferred Unit Distributions In May 2024, first 2024 first 2024 Warrant Exercise On April 16, 2024 ( April 18, 2024, 15 April 2024.

Insider Trading Arrangements

Insider Trading Arrangements	3 Months Ended
	Mar. 31, 2024
Insider Trading Arr Line Items
Material Terms of Trading Arrangement [Text Block]	5. None
Rule 10b5-1 Arrangement Adopted [Flag]	false
Non-Rule 10b5-1 Arrangement Adopted [Flag]	false
Rule 10b5-1 Arrangement Terminated [Flag]	false
Non-Rule 10b5-1 Arrangement Terminated [Flag]	false

Note 2 - Revenues From Contra_2

Note 2 - Revenues From Contracts With Customers (Tables)	3 Months Ended
	Mar. 31, 2024
Notes Tables
Disaggregation of Revenue [Table Text Block]	For the Three Months Ended March 31, (In thousands) 2024 2023 Coal royalty revenues $ 46,818 $ 58,023 Production lease minimum revenues 924 613 Minimum lease straight-line revenues 4,171 4,503 Carbon neutral initiative revenues 2,161 2,118 Property tax revenues 1,892 1,470 Wheelage revenues 2,672 3,869 Coal overriding royalty revenues 1,169 188 Lease amendment revenues 702 851 Aggregates royalty revenues 772 753 Oil and gas royalty revenues 3,640 3,588 Other revenues 653 295 Royalty and other mineral rights revenues $ 65,574 $ 76,271 Transportation and processing services revenues 2,836 2,933 Total Mineral Rights segment revenues from contracts with customers $ 68,410 $ 79,204
Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block]	March 31, December 31, (In thousands) 2024 2023 Receivables Accounts receivable, net $ 29,978 $ 37,206 Other current assets, net (1) 2,221 429 Contract liabilities Current portion of deferred revenue $ 5,635 $ 4,599 Deferred revenue 38,348 38,356 For the Three Months Ended March 31, (In thousands) 2024 2023 Balance at beginning of period (current and non-current) $ 42,955 $ 46,437 Increase due to minimums and lease amendment fees 6,979 7,770 Recognition of previously deferred revenue (5,951 ) (7,924 ) Balance at end of period (current and non-current) $ 43,983 $ 46,283
Lessor, Operating Lease, Payment to be Received, Maturity [Table Text Block]	Lease Term (1) Weighted Average Remaining Years Annual Minimum Payments 0 - 5 years 1.9 $ 17,362 5 - 10 years 6.3 17,237 10+ years 11.8 25,779 Total 7.4 $ 60,378

Note 4 - Common and Preferred_2

Note 4 - Common and Preferred Unit Distributions (Tables)	3 Months Ended
	Mar. 31, 2024
Notes Tables
Distributions Made to Limited Partner, by Distribution [Table Text Block]	Common Units Preferred Units Month Paid Period Covered by Distribution Distribution per Unit Total Distribution (1) Distribution per Unit Total Distribution (In thousands) 2024 February October 1 - December 31, 2023 $ 0.75 $ 9,918 $ 30.00 $ 2,150 March (2) Special Distribution 2.44 32,268 — — 2023 February October 1 - December 31, 2022 $ 0.75 $ 9,571 $ 30.00 $ 7,500 February (3) January 1 - February 8, 2023 — — 12.33 586 March (4) Special Distribution 2.43 31,329 — —

Note 5 - Net Income Per Commo_2

Note 5 - Net Income Per Common Unit (Tables)	3 Months Ended
	Mar. 31, 2024
Notes Tables
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]	For the Three Months Ended March 31, (In thousands, except per unit data) 2024 2023 Basic net income per common unit Net income attributable to common unitholders $ 52,982 $ 55,258 Weighted average common units—basic 12,832 12,570 Basic net income per common unit $ 4.13 $ 4.40 Diluted net income per common unit Weighted average common units—basic 12,832 12,570 Plus: dilutive effect of preferred units 775 3,778 Plus: dilutive effect of warrants 521 1,255 Plus: dilutive effect of unvested unit-based awards 265 209 Weighted average common units—diluted 14,393 17,812 Net income $ 56,213 $ 79,275 Less: income attributable to preferred unitholders — (586 ) Less: redemption of preferred units — (16,228 ) Diluted net income attributable to common unitholders and the general partner $ 56,213 $ 62,461 Less: diluted net income attributable to the general partner (1,124 ) (1,249 ) Diluted net income attributable to common unitholders $ 55,089 $ 61,212 Diluted net income per common unit $ 3.83 $ 3.44

Note 6 - Segment Information (T

Note 6 - Segment Information (Tables)	3 Months Ended
	Mar. 31, 2024
Notes Tables
Schedule of Segment Reporting Information, by Segment [Table Text Block]	Operating Segments (In thousands) Mineral Rights Soda Ash Corporate and Financing Total For the Three Months Ended March 31, 2024 Revenues $ 70,799 $ 5,450 $ — $ 76,249 Gain on asset sales and disposals 165 — — 165 Operating and maintenance expenses 5,671 62 — 5,733 Depreciation, depletion and amortization 4,649 — 5 4,654 General and administrative expenses — — 6,327 6,327 Interest expense, net — — 3,487 3,487 Net income (loss) 60,644 5,388 (9,819 ) 56,213 For the Three Months Ended March 31, 2023 Revenues $ 79,869 $ 19,254 $ — $ 99,123 Gain on asset sales and disposals 96 — — 96 Operating and maintenance expenses 7,005 158 — 7,163 Depreciation, depletion and amortization 4,079 — 4 4,083 General and administrative expenses — — 5,845 5,845 Interest expense, net — — 2,853 2,853 Net income (loss) 68,881 19,096 (8,702 ) 79,275

Note 7 - Equity Investment (Tab

Note 7 - Equity Investment (Tables)	3 Months Ended
	Mar. 31, 2024
Notes Tables
Equity Method Investments [Table Text Block]	For the Three Months Ended March 31, (In thousands) 2024 2023 Balance at beginning of period $ 276,549 $ 306,470 Income allocation to NRP’s equity interests (1) 6,646 20,364 Amortization of basis difference (1,196 ) (1,110 ) Other comprehensive income (loss) 845 (19,583 ) Distributions (14,210 ) (10,780 ) Balance at end of period $ 268,634 $ 295,361 For the Three Months Ended March 31, (In thousands) 2024 2023 Net sales $ 130,431 $ 207,128 Gross profit 21,133 49,055 Net income 13,563 41,560

Note 8 - Mineral Rights, Net (T

Note 8 - Mineral Rights, Net (Tables)	3 Months Ended
	Mar. 31, 2024
Notes Tables
Mineral Properties Disclosure [Table Text Block]	March 31, 2024 December 31, 2023 (In thousands) Carrying Value Accumulated Depletion Net Book Value Carrying Value Accumulated Depletion Net Book Value Coal properties $ 661,256 $ (289,570 ) $ 371,686 $ 661,256 $ (285,470 ) $ 375,786 Aggregates properties 8,655 (3,848 ) 4,807 8,655 (3,761 ) 4,894 Oil and gas royalty properties 12,354 (10,203 ) 2,151 12,354 (10,082 ) 2,272 Other 13,143 (1,611 ) 11,532 13,143 (1,612 ) 11,531 Total mineral rights, net $ 695,408 $ (305,232 ) $ 390,176 $ 695,408 $ (300,925 ) $ 394,483

Note 9 - Debt, Net (Tables)

Note 9 - Debt, Net (Tables)	3 Months Ended
	Mar. 31, 2024
Notes Tables
Schedule of Long-Term Debt Instruments [Table Text Block]	March 31, December 31, (In thousands) 2024 2023 Opco Credit Facility $ 146,191 $ 95,834 Opco Senior Notes 5.82 $ — $ 12,685 8.92 — 4,012 5.03 34,262 34,262 5.18 8,732 8,732 Total Opco Senior Notes $ 42,994 $ 59,691 Total debt at face value $ 189,185 $ 155,525 Net unamortized debt issuance costs (388 ) (467 ) Total debt, net $ 188,797 $ 155,058 Less: current portion of long-term debt (14,202 ) (30,785 ) Total long-term debt, net $ 174,595 $ 124,273

Note 10 - Fair Value Measurem_2

Note 10 - Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 2024
Notes Tables
Fair Value Option, Disclosures [Table Text Block]	March 31, 2024 December 31, 2023 Fair Value Carrying Estimated Carrying Estimated (In thousands) Hierarchy Level Value Fair Value Value Fair Value Debt: Opco Senior Notes (1) 3 $ 42,606 $ 39,971 $ 59,224 $ 56,533 Opco Credit Facility (2) 3 146,191 146,191 95,834 95,384 Assets: Contract receivable, net (current and long-term) (3) 3 $ 28,309 $ 24,071 $ 28,946 $ 24,492

Note 11 - Related Party Trans_2

Note 11 - Related Party Transactions (Tables)	3 Months Ended
	Mar. 31, 2024
Notes Tables
Schedule of Related Party Transactions [Table Text Block]	For the Three Months Ended March 31, (In thousands) 2024 2023 Operating and maintenance expenses $ 1,766 $ 1,719 General and administrative expenses 1,303 1,320

Note 12 - Major Customers (Tabl

Note 12 - Major Customers (Tables)	3 Months Ended
	Mar. 31, 2024
Notes Tables
Schedules of Concentration of Risk, by Risk Factor [Table Text Block]	For the Three Months Ended March 31, 2024 2023 (In thousands) Revenues Percent Revenues Percent Alpha Metallurgical Resources, Inc. (1) $ 20,902 27 % $ 24,218 24 % Foresight Energy Resources LLC ("Foresight") (1) $ 12,846 17 % $ 12,529 13 %

Note 14 - Unit-based Compensa_2

Note 14 - Unit-based Compensation (Tables)	3 Months Ended
	Mar. 31, 2024
Notes Tables
Share-Based Payment Arrangement, Activity [Table Text Block]	(In thousands) Common Units Weighted Average Grant Date Fair Value per Common Unit Outstanding at January 1, 2024 483 $ 46.21 Granted 65 $ 103.50 Fully vested and issued (197 ) $ 38.76 Outstanding at March 31, 2024 351 $ 60.91

Note 16 - Credit Losses (Tables

Note 16 - Credit Losses (Tables)	3 Months Ended
	Mar. 31, 2024
Notes Tables
Accounts Receivable, Allowance for Credit Loss [Table Text Block]	March 31, 2024 December 31, 2023 (In thousands) Gross CECL Allowance Net Gross CECL Allowance Net Receivables $ 40,992 $ (4,896 ) $ 36,096 $ 47,170 $ (5,655 ) $ 41,515 Long-term contract receivable 26,552 (920 ) 25,632 27,265 (944 ) 26,321 Total $ 67,544 $ (5,816 ) $ 61,728 $ 74,435 $ (6,599 ) $ 67,836

Note 1 - Basis of Presentation

Note 1 - Basis of Presentation (Details Textual)	3 Months Ended
	Mar. 31, 2024
Number of Operating Segments	2
Number of Wholly Owned Operating Companies	1
Sisecam Wyoming [Member]
Equity Method Investment, Ownership Percentage	49%

Note 2 - Revenues From Contra_3

Note 2 - Revenues From Contracts With Customers - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Revenue from contract with customers	$ 65,574	$ 76,271
Mineral Rights Segment [Member] | Operating Segments [Member]
Revenue from contract with customers	68,410	79,204
Coal Royalty Revenues [Member] | Mineral Rights Segment [Member]
Revenue from contract with customers	46,818	58,023
Production Lease Minimum Revenues [Member] | Mineral Rights Segment [Member]
Revenue from contract with customers	924	613
Minimum Lease Straight-line Revenues [Member] | Mineral Rights Segment [Member]
Revenue from contract with customers	4,171	4,503
Carbon Neutral Initiatives [Member] | Mineral Rights Segment [Member]
Revenue from contract with customers	2,161	2,118
Property Tax Revenues [Member] | Mineral Rights Segment [Member]
Revenue from contract with customers	1,892	1,470
Wheelage Revenues [Member] | Mineral Rights Segment [Member]
Revenue from contract with customers	2,672	3,869
Coal Overriding Royalty Revenues [Member] | Mineral Rights Segment [Member]
Revenue from contract with customers	1,169	188
Lease Amendment Revenues [Member] | Mineral Rights Segment [Member]
Revenue from contract with customers	702	851
Aggregates Royalty Revenues [Member] | Mineral Rights Segment [Member]
Revenue from contract with customers	772	753
Oil and Gas Royalty Revenues [Member] | Mineral Rights Segment [Member]
Revenue from contract with customers	3,640	3,588
Other Revenues [Member] | Mineral Rights Segment [Member]
Revenue from contract with customers	653	295
Transportation and Processing Services [Member] | Mineral Rights Segment [Member]
Revenue from contract with customers	$ 2,836	$ 2,933

Note 2 - Revenue From Contracts

Note 2 - Revenue From Contracts With Customers - Assets and Liabilities (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Current portion of deferred revenue		$ 5,635		$ 4,599
Deferred revenue		38,348		38,356
Balance		42,955	$ 46,437
Increase due to minimums and lease amendment fees		6,979	7,770
Recognition of previously deferred revenue		(5,951)	(7,924)
Balance		43,983	$ 46,283
Coal Royalty Revenues [Member]
Current portion of deferred revenue		5,635		4,599
Deferred revenue		38,348		38,356
Coal Royalty Revenues [Member] | Accounts Receivable [Member]
Contract with customer, current		29,978		37,206
Coal Royalty Revenues [Member] | Other Current Assets [Member]
Contract with customer, current	[1]	$ 2,221		$ 429
[1]Other current assets, net includes short-term notes receivables from contracts with customers.

Note 2 - Revenue From Contrac_2

Note 2 - Revenue From Contracts With Customers - Operating Lease Payments Receivable (Details) $ in Thousands	Mar. 31, 2024 USD ($)	[1]
Weighted average remaining years (Year)	7 years 4 months 24 days
Annual minimum payments	$ 60,378
Lease Term, 0 to 5 Years [Member]
Weighted average remaining years (Year)	1 year 10 months 24 days
Annual minimum payments	$ 17,362
Lease Term, 5 to 10 Years [Member]
Weighted average remaining years (Year)	6 years 3 months 18 days
Annual minimum payments	$ 17,237
Lease Term, Greater Than 10 Years [Member]
Weighted average remaining years (Year)	11 years 9 months 18 days
Annual minimum payments	$ 25,779
[1]Lease term does not include renewal periods.

Note 3 - Class A Convertible _2

Note 3 - Class A Convertible Preferred Units and Warrants (Details Textual) $ / shares in Units, $ in Thousands								1 Months Ended		3 Months Ended
	Apr. 18, 2024 USD ($) $ / shares shares	Apr. 16, 2024 $ / shares shares	Feb. 14, 2024 USD ($) $ / shares shares	Feb. 08, 2024 USD ($) $ / shares shares	Feb. 07, 2024 USD ($) $ / shares shares	Jan. 29, 2024 USD ($) $ / shares shares	Mar. 02, 2017 USD ($) $ / shares shares	Apr. 18, 2024 $ / shares shares	Feb. 28, 2023 shares	Mar. 31, 2023 USD ($) $ / shares shares	Mar. 31, 2024 USD ($) $ / shares shares	Dec. 31, 2023 USD ($) $ / shares shares
Temporary Equity, Par or Stated Value Per Share (in dollars per share) | $ / shares											$ 1,000	$ 1,000
Preferred Units, Number of Redeemed Units (in shares)									47,499
Temporary Equity, Carrying Amount, Including Portion Attributable to Noncontrolling Interests | $											$ 47,181	$ 47,181
Warrants and Rights Outstanding | $											$ 4,804	$ 23,095
Warrants at 22.81 Strike Price [Member]
Class of Warrant or Right Warrants, Issued (in shares)							1,750,000
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares							$ 22.81
Warrants at 22.81 Strike Price [Member] | Warrant Holder [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares										$ 22.81
Class of Warrant or Right, Outstanding (in shares)										752,500
Warrants at 34.00 Strike Price [Member]
Class of Warrant or Right Warrants, Issued (in shares)							2,250,000
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares							$ 34
Warrants at 34.00 Strike Price [Member] | Warrant Holder [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares			$ 34	$ 34	$ 34	$ 34				$ 34	$ 34	$ 34
Class Of Warrants, Warrants Exercised (in shares)			500,000	128,750	128,750	462,165					1,219,665
Warrants and Rights Settled | $			$ 29,700	$ 7,900	$ 8,000	$ 10,000
Partners' Capital Account, Units, Warrant Settlements (in shares)						198,767
Volume Weighted Average Price of Share (in dollars per share) | $ / shares			$ 93.47	$ 95.63	$ 96.29	$ 97.62
Class of Warrant or Right, Outstanding (in shares)											320,335
Warrants and Rights Outstanding | $											$ 4,800	$ 23,100
Warrants at 34.00 Strike Price [Member] | Warrant Holder [Member] | Subsequent Event [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares		$ 34
Warrants and Rights Settled | $	$ 10,000
Partners' Capital Account, Units, Warrant Settlements (in shares)	89,059
Volume Weighted Average Price of Share (in dollars per share) | $ / shares	$ 90.33							$ 90.33
Class of Warrant or Right, Outstanding (in shares)	0							0
Warrants Exercised In Period (in shares)		320,335						320,335
Originally Issued Warrants [Member] | Warrant Holder [Member]
Class of Warrant or Right, Outstanding (in shares)											4,000,000	1,540,000
Originally Issued Warrants [Member] | Warrant Holder [Member] | Subsequent Event [Member]
Class of Warrant or Right, Outstanding (in shares)	4,000,000							4,000,000
Class A Convertible Preferred Units [Member]
Preferred Units, Issued (in shares)							250,000
Temporary Equity, Par or Stated Value Per Share (in dollars per share) | $ / shares							$ 1,000
Preferred Units Origination Fee Percent							2.50%
Preferred Stock, Dividend Rate, Percentage							12%
Convertible Preferred Units Maximum Redeemed Units Percent							33%
Convertible Preferred Units, Redemption Price, Minimum (in dollars per share) | $ / shares							$ 51
Debt Instrument Covenants Consolidated Leverage Ratio Minimum							3.25
Debt Instrument Covenants Distributable Cash Flow Ratio Maximum							1.2
Partners' Capital, Distribution Amount Per Share (in dollars per share) | $ / shares							$ 0.45
Preferred Units Preferred Purchaser Approval Rights Ownership Threshold							20%
Preferred Units, Number of Redeemed Units (in shares)										47,499
Preferred Units, Value of Redeemed Units | $										$ 47,500
Preferred Units, Outstanding (in shares)											71,666	71,666
Temporary Equity, Carrying Amount, Including Portion Attributable to Noncontrolling Interests | $											$ 47,200	$ 47,200
Class A Convertible Preferred Units [Member] | Debt Instrument, Redemption, Period One [Member]
Convertible Preferred Units Conversion to Common Units Discount Percentage							7.50%
Convertible Preferred Units Purchase Price Multiplier							1.5
Class A Convertible Preferred Units [Member] | Debt Instrument, Redemption, Period Three [Member]
Convertible Preferred Units Conversion to Common Units Discount Percentage							10%
Convertible Preferred Units Purchase Price Multiplier							1.85
Class A Convertible Preferred Units [Member] | Debt Instrument, Redemption, Period Two [Member]
Convertible Preferred Units Purchase Price Multiplier							1.7
Preferred Stock [Member]
Proceeds from Issuance of Preferred Stock, Preference Stock, and Warrants, Total | $							$ 250,000

Note 4 - Common and Preferred_3

Note 4 - Common and Preferred Unit Distributions (Details Textual) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended
	Feb. 28, 2023	Mar. 31, 2024	Mar. 31, 2023
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest Allocated to Preferred Unit Holders		$ (2,150)	$ (6,661)
Preferred Stock Redemption Premium		0	16,228
Preferred Units, Number of Redeemed Units (in shares)	47,499
February 2022 Redeemed Units [Member] | Preferred Partner [Member] | Preferred Stock [Member]
Dividends, Preferred Stock, Cash			600
Common Unitholders And General Partner [Member]
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest Allocated to Preferred Unit Holders		$ 2,200	$ 6,700
Partner, General [Member]
Limited Liability Company or Limited Partnership, Members or Limited Partners, Ownership Interest		2%

Note 4 - Common and Preferred_4

Note 4 - Common and Preferred Unit Distributions - Distributions Made to Partners (Details) - USD ($) $ / shares in Units, $ in Thousands		1 Months Ended						3 Months Ended
		Mar. 31, 2024	[1]	Feb. 29, 2024	Mar. 31, 2023	[2]	Feb. 28, 2023	Mar. 31, 2024	Mar. 31, 2023
Distributions, common units								$ 42,186	$ 40,900
Preferred Partner [Member] | Preferred Stock [Member]
Distribution per unit, common units (in dollars per share)		$ 0		$ 30	$ 0		$ 30
Distribution, preferred stock		$ 0		$ 2,150	$ 0		$ 7,500
Preferred Partner [Member] | Preferred Stock [Member] | Distributions Covering January 1 - February 8, 2023 [Member]
Distribution per unit, common units (in dollars per share)	[3]						$ 12.33
Distribution, preferred stock	[3]						$ 586
Common Unitholders, General Partner [Member]
Distribution per unit, common units (in dollars per share)		$ 2.44		$ 0.75	$ 2.43		$ 0.75
Distributions, common units	[4]	$ 32,268		$ 9,918	$ 31,329		$ 9,571
Common Unitholders, General Partner [Member] | Distributions Covering January 1 - February 8, 2023 [Member]
Distribution per unit, common units (in dollars per share)	[3]						$ 0
Distributions, common units	[3],[4]						$ 0
[1]Special distribution was made to help cover unitholder tax liabilities associated with owning NRP's common units during 2023.[2]Special distribution was made to help cover unitholder tax liabilities associated with owning NRP's common units during 2022.[3]Relates to accrued distribution paid upon the redemption of 47,499 preferred units in February 2023.[4]Totals include the amount paid to NRP's general partner in accordance with the general partner's 2% general partner interest.

Note 5 - Net Income Per Commo_3

Note 5 - Net Income Per Common Unit (Details Textual) - $ / shares	Mar. 31, 2024	Feb. 14, 2024	Feb. 08, 2024	Feb. 07, 2024	Jan. 29, 2024	Dec. 31, 2023	Mar. 31, 2023	Mar. 02, 2017
Warrants at 34.00 Strike Price [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)								$ 34
Warrants at 22.81 Strike Price [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)								$ 22.81
Warrant Holder [Member] | Warrants at 34.00 Strike Price [Member]
Class of Warrant or Right, Outstanding (in shares)	320,335
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)	$ 34	$ 34	$ 34	$ 34	$ 34	$ 34	$ 34
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)							2,250,000
Warrant Holder [Member] | Warrants at 22.81 Strike Price [Member]
Class of Warrant or Right, Outstanding (in shares)							752,500
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)							$ 22.81

Note 5 - Net Income Per Commo_4

Note 5 - Net Income Per Common Unit - Schedule of Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2024		Mar. 31, 2023
Net income attributable to common unitholders	$ 52,982		$ 55,258
Weighted average common units—basic (in shares)	12,832		12,570
Basic net income per common unit (in dollars per share)	$ 4.13		$ 4.4
Plus: dilutive effect of preferred units (in shares)	775		3,778
Plus: dilutive effect of warrants (in shares)	521		1,255
Plus: dilutive effect of unvested unit-based awards (in shares)	265		209
Weighted average common units—diluted (in shares)	14,393		17,812
Net income	$ 56,213	[1]	$ 79,275	[2]
Less: income attributable to preferred unitholders	0		(586)
Less: redemption of preferred units	0		(16,228)
Diluted net income attributable to common unitholders and the general partner	56,213		62,461
Less: diluted net income attributable to the general partner	(1,124)		(1,249)
Diluted net income attributable to common unitholders	$ 55,089		$ 61,212
Diluted net income per common unit (in dollars per share)	$ 3.83		$ 3.44
[1]Net income includes $2.15 million of income attributable to preferred unitholders that accumulated during the period, of which $2.11 million is allocated to the common unitholders and $0.04 million is allocated to the general partner.[2]Net income includes $6.66 million of income attributable to preferred unitholders that accumulated during the period, of which $6.53 million is allocated to the common unitholders and $0.13 million is allocated to the general partner.

Note 6 - Segment Information (D

Note 6 - Segment Information (Details Textual)	3 Months Ended
	Mar. 31, 2024
Number of Operating Segments	2
Sisecam Wyoming [Member]
Equity Method Investment, Ownership Percentage	49%

Note 6 - Segment Information -

Note 6 - Segment Information - Information By Segment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Revenues	$ 76,249	$ 99,123
Gain on asset sales and disposals	165	96
Operating and maintenance expenses	5,733	7,163
Depreciation, depletion and amortization	4,654	4,083
General and administrative expenses	6,327	5,845
Interest expense, net	3,487	2,853
Net income (loss)	56,213	79,275
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member]
Revenues	0	0
Gain on asset sales and disposals	0	0
Operating and maintenance expenses	0	0
Depreciation, depletion and amortization	5	4
General and administrative expenses	6,327	5,845
Interest expense, net	3,487	2,853
Net income (loss)	(9,819)	(8,702)
Mineral Rights Segment [Member] | Operating Segments [Member]
Revenues	70,799	79,869
Gain on asset sales and disposals	165	96
Operating and maintenance expenses	5,671	7,005
Depreciation, depletion and amortization	4,649	4,079
General and administrative expenses	0	0
Interest expense, net	0	0
Net income (loss)	60,644	68,881
Soda Ash Segment [Member] | Operating Segments [Member]
Revenues	5,450	19,254
Gain on asset sales and disposals	0	0
Operating and maintenance expenses	62	158
Depreciation, depletion and amortization	0	0
General and administrative expenses	0	0
Interest expense, net	0	0
Net income (loss)	$ 5,388	$ 19,096

Note 7 - Equity Investment (Det

Note 7 - Equity Investment (Details Textual) - Sisecam Wyoming [Member] - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Equity Method Investment, Ownership Percentage	49%
Reclassification Out Of Accumulated Other Comprehensive Income (Loss)	$ 1.6	$ (20.6)

Note 7 - Equity Investment - In

Note 7 - Equity Investment - Investment Activity (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2024		Mar. 31, 2023
Beginning Balance		$ 276,549
Ending Balance		268,634
Net income		56,213	[1]	$ 79,275	[2]
Sisecam Wyoming [Member]
Net sales		130,431		207,128
Gross profit		21,133		49,055
Net income		13,563		41,560
Sisecam Wyoming [Member]
Beginning Balance		276,549		306,470
Income allocation to NRP’s equity interests (1)	[3]	6,646		20,364
Amortization of basis difference		(1,196)		(1,110)
Other comprehensive income (loss)		845		(19,583)
Distributions		(14,210)		(10,780)
Ending Balance		$ 268,634		$ 295,361
[1]Net income includes $2.15 million of income attributable to preferred unitholders that accumulated during the period, of which $2.11 million is allocated to the common unitholders and $0.04 million is allocated to the general partner.[2]Net income includes $6.66 million of income attributable to preferred unitholders that accumulated during the period, of which $6.53 million is allocated to the common unitholders and $0.13 million is allocated to the general partner.[3]Amounts reclassified into income out of accumulated other comprehensive loss were $1.6 million and $(20.6) million for the three months ended March 31, 2024 and 2023, respectively.

Note 8 - Mineral Rights, Net (D

Note 8 - Mineral Rights, Net (Details Textual) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Coal Mineral Rights [Member]
Depletion	$ 4.3	$ 3.9

Note 8 - Mineral Rights, Net -

Note 8 - Mineral Rights, Net - Composition of Mineral Rights (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Mineral Properties, carrying value	$ 695,408	$ 695,408
Mineral Properties, accumulated depletion	(305,232)	(300,925)
Mineral Properties, net book value	390,176	394,483
Coal Properties [Member]
Mineral Properties, carrying value	661,256	661,256
Mineral Properties, accumulated depletion	(289,570)	(285,470)
Mineral Properties, net book value	371,686	375,786
Aggregates Properties [Member]
Mineral Properties, carrying value	8,655	8,655
Mineral Properties, accumulated depletion	(3,848)	(3,761)
Mineral Properties, net book value	4,807	4,894
Oil and Gas Royalty Properties [Member]
Mineral Properties, carrying value	12,354	12,354
Mineral Properties, accumulated depletion	(10,203)	(10,082)
Mineral Properties, net book value	2,151	2,272
Other [Member]
Mineral Properties, carrying value	13,143	13,143
Mineral Properties, accumulated depletion	(1,611)	(1,612)
Mineral Properties, net book value	$ 11,532	$ 11,531

Note 9 - Debt, Net (Details Tex

Note 9 - Debt, Net (Details Textual) $ in Thousands		1 Months Ended	3 Months Ended
	Feb. 01, 2024 USD ($)	Feb. 29, 2024 USD ($)	Mar. 31, 2024 USD ($)	Mar. 31, 2023 USD ($)	Jan. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	May 31, 2023 USD ($)	Aug. 31, 2022 USD ($)
Nontrade Receivables, Noncurrent			$ 25,632			$ 26,321
Long-Term Debt, Gross			189,185			$ 155,525
Opco [Member] | Minimum [Member]
Ratio of EBITDA To Consolidated Fixed Charges						3.5
Floating Rate Revolving Credit Facility Due August 2027 [Member] | Opco [Member]
Line of Credit Facility, Remaining Borrowing Capacity			53,800			$ 59,200	$ 155,000	$ 130,000
Line of Credit Facility, Maximum Borrowing Capacity, Addition of Future Commitments							$ 200,000
Line of Credit Facility, Increase (Decrease), Net	$ 30,000	$ 15,000
Line of Credit Facility, Maximum Borrowing Capacity	$ 185,000	200,000			$ 155,000
Long-Term Line of Credit			146,200			95,800
Proceeds from Lines of Credit			89,400	$ 94,200
Repayments of Lines of Credit			$ 39,000	$ 73,000
Long-Term Debt, Weighted Average Interest Rate, over Time			8.94%	8.14%
Nontrade Receivables, Noncurrent			$ 25,600			26,300
Long-Term Debt, Gross			146,191			95,834
Floating Rate Revolving Credit Facility Due August 2027 [Member] | Opco [Member] | Other Noncurrent Assets [Member]
Debt Instrument, Collateral Amount			312,400			316,300
Floating Rate Revolving Credit Facility Due August 2027 [Member] | Opco [Member] | New Lender [Member]
Line of Credit Facility, Maximum Borrowing Capacity		$ 30,000
Senior Notes [Member] | Opco [Member]
Long-Term Debt, Gross			43,000			$ 59,700
Repayments of Debt			$ 16,700	$ 16,700

Note 9 - Debt, Net - Schedule o

Note 9 - Debt, Net - Schedule of Long-term Debt (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Debt instrument, carrying value	$ 189,185	$ 155,525
Net unamortized debt issuance costs	(388)	(467)
Total debt, net	188,797	155,058
Less: current portion of long-term debt	(14,202)	(30,785)
Total long-term debt, net	174,595	124,273
Senior Notes [Member] | Five Point Eight Two Percent Senior Note Due March Two Zero Two Four [Member]
Debt instrument, carrying value	0	12,685
Senior Notes [Member] | Eight Point Nine Two Percent Senior Note Due March Two Zero Two Four [Member]
Debt instrument, carrying value	0	4,012
Senior Notes [Member] | Five Point Zero Three Percent Senior Note Due December Two Zero Two Six [Member]
Debt instrument, carrying value	34,262	34,262
Senior Notes [Member] | Five Point One Eight Percent Senior Note Due December Two Zero Two Six [Member]
Debt instrument, carrying value	8,732	8,732
Opco Senior Notes [Member]
Debt instrument, carrying value	42,994	59,691
Opco [Member] | Floating Rate Revolving Credit Facility Due August 2027 [Member]
Debt instrument, carrying value	146,191	95,834
Opco [Member] | Senior Notes [Member]
Debt instrument, carrying value	$ 43,000	$ 59,700

Note 9 - Debt, Net - Schedule_2

Note 9 - Debt, Net - Schedule of Long-term Debt (Details) (Parentheticals) - Senior Notes [Member]	Mar. 31, 2024	Dec. 31, 2023
Five Point Eight Two Percent Senior Note Due March Two Zero Two Four [Member]
Debt instrument, interest rate	5.82%	5.82%
Eight Point Nine Two Percent Senior Note Due March Two Zero Two Four [Member]
Debt instrument, interest rate	8.92%	8.92%
Five Point Zero Three Percent Senior Note Due December Two Zero Two Six [Member]
Debt instrument, interest rate	5.03%	5.03%
Five Point One Eight Percent Senior Note Due December Two Zero Two Six [Member]
Debt instrument, interest rate	5.18%	5.18%

Note 10 - Fair Value Measurem_3

Note 10 - Fair Value Measurements (Details Textual) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Discount Rate	15%	15%
Embedded Derivative, Fair Value of Embedded Derivative Liability	$ 0	$ 0

Note 10 - Fair Value Measurem_4

Note 10 - Fair Value Measurements - Fair Value of Financial Assets and Liabilities (Details) - Fair Value, Inputs, Level 3 [Member] - USD ($) $ in Thousands		Mar. 31, 2024	Dec. 31, 2023
Reported Value Measurement [Member]
Contract receivable, net (current and long-term)	[1]	$ 28,309	$ 28,946
Estimate of Fair Value Measurement [Member]
Contract receivable, net (current and long-term)	[1]	24,071	24,492
Opco Senior Notes [Member] | Reported Value Measurement [Member]
Long term debt, fair value	[2]	42,606	59,224
Opco Senior Notes [Member] | Estimate of Fair Value Measurement [Member]
Long term debt, fair value	[2]	39,971	56,533
Floating Rate Revolving Credit Facility Due August 2027 [Member] | Reported Value Measurement [Member]
Long term debt, fair value	[3]	146,191	95,834
Floating Rate Revolving Credit Facility Due August 2027 [Member] | Estimate of Fair Value Measurement [Member]
Long term debt, fair value	[3]	$ 146,191	$ 95,384
[1]The fair value of the Partnership's contract receivable is determined based on the present value of future cash flow projections related to the underlying asset at a discount rate of 15% at March 31, 2024 and December 31, 2023.[2]The fair value of the Opco Senior Notes was estimated by management utilizing the present value replacement method incorporating the interest rate of the Opco Credit Facility.[3]The fair value of the Opco Credit Facility approximates the outstanding borrowing amount because the interest rates are variable and reflective of market rates and the terms of the credit facility allow the Partnership to repay this debt at any time without penalty.

Note 11 - Related Party Trans_3

Note 11 - Related Party Transactions (Details Textual) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Assets [Abstract]
Other Assets, Noncurrent	$ 8,034		$ 7,540
Liabilities [Abstract]
Other Liabilities, Noncurrent	6,305		7,172
Accounts Payable, Current	1,514		885
Operating Costs and Expenses	$ 5,733	$ 7,163
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Other Assets, Noncurrent
Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration]	Other Liabilities, Noncurrent
WPPLP [Member]
Accounts Payable, Current	$ 400		200
Operating Lease, Liability	3,500		3,500
Operating Costs and Expenses	30	$ 2,000
Operating Lease, Right-of-Use Asset	3,500		3,500
Quintana Minerals Corp [Member] | Affiliated Entity [Member]
Accounts Payable, Current	$ 400		$ 400

Note 11 - Related Party Trans_4

Note 11 - Related Party Transactions - General Partner Affiliates (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Operating Costs and Expenses	$ 5,733	$ 7,163
QMC and WPPLP and QID [Member] | Affiliated Entity [Member]
Operating Costs and Expenses	1,766	1,719
General and administrative expenses	$ 1,303	$ 1,320

Note 12 - Major Customers - Con

Note 12 - Major Customers - Concentration Risk (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2024	Mar. 31, 2023
Alpha Metallurgical Resources [Member]
Net sales	[1]	$ 20,902	$ 24,218
Alpha Metallurgical Resources [Member] | Revenue Benchmark [Member] | Customer Concentration Risk [Member]
Revenue, percent (1)	[1]	27%	24%
Foresight Energy Resources [Member]
Net sales	[1]	$ 12,846	$ 12,529
Foresight Energy Resources [Member] | Revenue Benchmark [Member] | Customer Concentration Risk [Member]
Revenue, percent (1)	[1]	17%	13%
[1]Revenues from Alpha Metallurgical Resources, Inc. and Foresight are included within the Partnership's Mineral Rights segment.

Note 14 - Unit-based Compensa_3

Note 14 - Unit-based Compensation (Details Textual) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Fair Value	$ 6.7	$ 15.9
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount	$ 17.5		$ 13.3
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)	2 years
Market-based Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Fair Value	$ 2.5	2.8
Market-based Awards [Member] | General and Administrative Expenses and Operating and Maintenance Expense [Member]
Share-Based Payment Arrangement, Expense	$ 3	$ 2.5

Note 14 - Unit-Based Compensa_4

Note 14 - Unit-Based Compensation - Share-based Compensation Activity (Details) shares in Thousands	3 Months Ended
	Mar. 31, 2024 $ / shares shares
Outstanding (in shares) | shares	483
Outstanding (in dollars per share) | $ / shares	$ 46.21
Granted (in shares) | shares	65
Granted (in dollars per share) | $ / shares	$ 103.5
Fully vested and issued (in shares) | shares	(197)
Fully vested and issued (in dollars per share) | $ / shares	$ 38.76
Outstanding (in shares) | shares	351
Outstanding (in dollars per share) | $ / shares	$ 60.91

Note 15 - Financing Transacti_2

Note 15 - Financing Transaction (Details Textual) - Sugar Camp Mine [Member] - USD ($)	12 Months Ended
	Dec. 31, 2032	Mar. 31, 2024
Lessor, Operating Lease, Renewal Term (Year)		80 years
Forecast [Member]
Operating Lease, Lease Income	$ 10,000

Note 16 - Credit Losses (Detail

Note 16 - Credit Losses (Details Textual) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Financing Receivable, Credit Loss, Expense (Reversal)	$ (0.8)	$ (0.6)

Note 16 - Credit Losses - Allow

Note 16 - Credit Losses - Allowance for Credit Losses (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Receivables, gross	$ 40,992	$ 47,170
Receivables, allowance	(4,896)	(5,655)
Receivables, net	36,096	41,515
Long-term contract receivable, gross	26,552	27,265
Long-term contract receivable, allowance	(920)	(944)
Long-term contract receivable, net	25,632	26,321
Total, gross	67,544	74,435
Total, allowance	(5,816)	(6,599)
Total, net	$ 61,728	$ 67,836

Note 17 - Subsequent Events (De

Note 17 - Subsequent Events (Details Textual) - USD ($) $ / shares in Units, $ in Thousands							1 Months Ended
	Apr. 18, 2024	Apr. 16, 2024	Feb. 14, 2024	Feb. 08, 2024	Feb. 07, 2024	Jan. 29, 2024	May 31, 2024	Apr. 30, 2024	Apr. 18, 2024	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023	Mar. 02, 2017
Warrants at 34.00 Strike Price [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)													$ 34
Warrant Holder [Member] | Warrants at 34.00 Strike Price [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)			$ 34	$ 34	$ 34	$ 34				$ 34	$ 34	$ 34
Warrants and Rights Settled			$ 29,700	$ 7,900	$ 8,000	$ 10,000
Partners' Capital Account, Units, Warrant Settlements (in shares)						198,767
Volume Weighted Average Price of Share (in dollars per share)			$ 93.47	$ 95.63	$ 96.29	$ 97.62
Class of Warrant or Right, Outstanding (in shares)										320,335
Warrant Holder [Member] | Originally Issued Warrants [Member]
Class of Warrant or Right, Outstanding (in shares)										4,000,000	1,540,000
Subsequent Event [Member]
Distribution Made to Limited Partner, Distributions Paid, Per Unit (in dollars per share)							$ 0.75
Dividends, Preferred Stock, Cash							$ 2,150
Subsequent Event [Member] | Warrant Holder [Member] | Warrants at 34.00 Strike Price [Member]
Warrants Exercised In Period (in shares)		320,335							320,335
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)		$ 34
Warrants and Rights Settled	$ 10,000
Partners' Capital Account, Units, Warrant Settlements (in shares)	89,059
Volume Weighted Average Price of Share (in dollars per share)	$ 90.33								$ 90.33
Class of Warrant or Right, Outstanding (in shares)	0								0
Increase (Decrease) in Partners' Capital								$ (4,800)
Subsequent Event [Member] | Warrant Holder [Member] | Originally Issued Warrants [Member]
Class of Warrant or Right, Outstanding (in shares)	4,000,000								4,000,000