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Note 8 - Mineral Rights, Net - Composition of Mineral Rights (Details) - USD ($) $ in Thousands | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Mineral Properties, carrying value | $ 687,959 | $ 695,113
Mineral Properties, accumulated depletion | (310,714) | (315,475)
Mineral Properties, net book value | 377,245 | 379,638
Coal Properties [Member] |  |
Mineral Properties, carrying value | 653,808 | 660,961
Mineral Properties, accumulated depletion | (294,522) | (299,404)
Mineral Properties, net book value | 359,286 | 361,557
Aggregates Properties [Member] |  |
Mineral Properties, carrying value | 8,655 | 8,655
Mineral Properties, accumulated depletion | (4,139) | (4,065)
Mineral Properties, net book value | 4,516 | 4,590
Oil and Gas Royalty Properties [Member] |  |
Mineral Properties, carrying value | 12,354 | 12,354
Mineral Properties, accumulated depletion | (10,441) | (10,394)
Mineral Properties, net book value | 1,913 | 1,960
Other [Member] |  |
Mineral Properties, carrying value | 13,142 | 13,143
Mineral Properties, accumulated depletion | (1,612) | (1,612)
Mineral Properties, net book value | $ 11,530 | $ 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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