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Note 3 - Revenues From Contracts With Customers - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Revenue from contract with customers |  | $ 232,351 | $ 278,733 | $ 307,013
Mineral Rights Segment [Member] | Operating Segments [Member] |  |  |  |
Revenue from contract with customers |  | 240,948 | 291,144 | 324,889
Coal Royalty Revenues [Member] | Mineral Rights Segment [Member] |  |  |  |
Revenue from contract with customers |  | 159,033 | 218,011 | 226,956
Production Lease Minimum Revenues [Member] | Mineral Rights Segment [Member] |  |  |  |
Revenue from contract with customers |  | 4,365 | 3,322 | 5,854
Minimum Lease Straight-line Revenues [Member] | Mineral Rights Segment [Member] |  |  |  |
Revenue from contract with customers |  | 16,530 | 19,389 | 18,792
Carbon Neutral Revenues [Member] | Mineral Rights Segment [Member] |  |  |  |
Revenue from contract with customers | [1] | 15,703 | 2,969 | 8,600
Property Tax Revenues [Member] | Mineral Rights Segment [Member] |  |  |  |
Revenue from contract with customers |  | 7,100 | 6,219 | 5,878
Wheelage Revenues [Member] | Mineral Rights Segment [Member] |  |  |  |
Revenue from contract with customers |  | 9,324 | 12,191 | 13,961
Coal Overriding Royalty Revenues [Member] | Mineral Rights Segment [Member] |  |  |  |
Revenue from contract with customers |  | 2,358 | 2,175 | 3,434
Lease Amendment Revenues [Member] | Mineral Rights Segment [Member] |  |  |  |
Revenue from contract with customers |  | 3,724 | 3,070 | 3,201
Aggregates Royalty Revenues [Member] | Mineral Rights Segment [Member] |  |  |  |
Revenue from contract with customers |  | 2,904 | 2,876 | 3,299
Oil and Gas Royalty Revenues [Member] | Mineral Rights Segment [Member] |  |  |  |
Revenue from contract with customers |  | 8,566 | 7,387 | 16,161
Other Revenues [Member] | Mineral Rights Segment [Member] |  |  |  |
Revenue from contract with customers |  | 2,744 | 1,124 | 877
Transportation and Processing Services [Member] | Mineral Rights Segment [Member] |  |  |  |
Revenue from contract with customers |  | $ 8,597 | $ 12,411 | $ 17,876
[1] | During 2024, NRP recorded revenues of approximately $13.4 million from a third party related to its creation of California Air Resources Board carbon offset credits from our properties. $11.3 million of this revenue was recorded in the three months ended December 31, 2024.

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 41 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-41 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 270 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482964/270-10-50-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 32 -Subparagraph (ee) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-32 Reference 4: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 32 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-32 Reference 5: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 32 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-32 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 924 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 11.L) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479941/924-10-S99-1 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-5 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 30 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-30 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 42 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-42 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 22 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-22 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 40 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-40 Reference 12: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 22 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-22 Reference 13: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-4 + Details
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