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Note 8 - Mineral Rights, Net - Composition of Mineral Rights (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Mineral Properties, carrying value | $ 695,833 | $ 695,971
Mineral Properties, accumulated depletion | (295,285) | (283,659)
Mineral Properties, net book value | 400,548 | 412,312
Coal Properties [Member] |  |
Mineral Properties, carrying value | 661,680 | 661,812
Mineral Properties, accumulated depletion | (279,988) | (269,037)
Mineral Properties, net book value | 381,692 | 392,775
Aggregates Properties [Member] |  |
Mineral Properties, carrying value | 8,655 | 8,655
Mineral Properties, accumulated depletion | (3,723) | (3,410)
Mineral Properties, net book value | 4,932 | 5,245
Oil and Gas Royalty Properties [Member] |  |
Mineral Properties, carrying value | 12,354 | 12,354
Mineral Properties, accumulated depletion | (9,962) | (9,600)
Mineral Properties, net book value | 2,392 | 2,754
Other [Member] |  |
Mineral Properties, carrying value | 13,144 | 13,150
Mineral Properties, accumulated depletion | (1,612) | (1,612)
Mineral Properties, net book value | $ 11,532 | $ 11,538

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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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 932 -SubTopic 360 -Name Accounting Standards Codification -Section 25 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482479/932-360-25-7 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 932 -SubTopic 235 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482274/932-235-50-4 + 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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 932 -SubTopic 360 -Name Accounting Standards Codification -Section 25 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482479/932-360-25-7 + Details
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