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Note 9 - Mineral Rights, Net - Composition of Mineral Rights (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Mineral Properties, carrying value | $ 695,113 | $ 695,408
Mineral Properties, accumulated depletion | (315,475) | (300,925)
Mineral Properties, net book value | 379,638 | 394,483
Coal Properties [Member] |  |
Mineral Properties, carrying value | 660,961 | 661,256
Mineral Properties, accumulated depletion | (299,404) | (285,470)
Mineral Properties, net book value | 361,557 | 375,786
Aggregates Properties [Member] |  |
Mineral Properties, carrying value | 8,655 | 8,655
Mineral Properties, accumulated depletion | (4,065) | (3,761)
Mineral Properties, net book value | 4,590 | 4,894
Oil and Gas Royalty Properties [Member] |  |
Mineral Properties, carrying value | 12,354 | 12,354
Mineral Properties, accumulated depletion | (10,394) | (10,082)
Mineral Properties, net book value | 1,960 | 2,272
Other [Member] |  |
Mineral Properties, carrying value | 13,143 | 13,143
Mineral Properties, accumulated depletion | (1,612) | (1,612)
Mineral Properties, net book value | $ 11,531 | $ 11,531

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- Definition The accumulated decrease in the carrying value of the mineral properties as a result of mine or mineral production. + References No definition available. + Details
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- Definition Carrying amount at the balance sheet date of mineral properties, gross of adjustments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 1 -SubTopic 10 -Topic 360 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482099/360-10-50-1 + Details
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- Definition Mineral properties, net of adjustments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 1 -SubTopic 10 -Topic 360 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482099/360-10-50-1 + Details
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- Details
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- Details
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