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Note 2 - Revenues From Contracts With Customers - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024
Revenue from contract with customers | $ 51,260 | $ 65,574
Mineral Rights Segment [Member] | Operating Segments [Member] |  |
Revenue from contract with customers | 55,145 | 68,410
Coal Royalty Revenues [Member] | Mineral Rights Segment [Member] |  |
Revenue from contract with customers | 35,498 | 46,818
Production Lease Minimum Revenues [Member] | Mineral Rights Segment [Member] |  |
Revenue from contract with customers | 2,725 | 924
Minimum Lease Straight-line Revenues [Member] | Mineral Rights Segment [Member] |  |
Revenue from contract with customers | 4,050 | 4,171
Oil and Gas Royalty Revenues [Member] | Mineral Rights Segment [Member] |  |
Revenue from contract with customers | 2,444 | 3,640
Carbon Neutral Revenues [Member] | Mineral Rights Segment [Member] |  |
Revenue from contract with customers | 595 | 2,161
Property Tax Revenues [Member] | Mineral Rights Segment [Member] |  |
Revenue from contract with customers | 1,637 | 1,892
Wheelage Revenues [Member] | Mineral Rights Segment [Member] |  |
Revenue from contract with customers | 1,738 | 2,672
Coal Overriding Royalty Revenues [Member] | Mineral Rights Segment [Member] |  |
Revenue from contract with customers | 880 | 1,169
Lease Amendment Revenues [Member] | Mineral Rights Segment [Member] |  |
Revenue from contract with customers | 655 | 702
Aggregates Royalty Revenues [Member] | Mineral Rights Segment [Member] |  |
Revenue from contract with customers | 853 | 772
Other Revenues [Member] | Mineral Rights Segment [Member] |  |
Revenue from contract with customers | 185 | 653
Transportation and Processing Services [Member] | Mineral Rights Segment [Member] |  |
Revenue from contract with customers | $ 3,885 | $ 2,836

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