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Note 8 - Mineral Rights, Net (Tables) | 9 Months Ended
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Sep. 30, 2023
Notes Tables |
Mineral Properties Disclosure [Table Text Block] |
|  | September 30, 2023 |  |  | December 31, 2022 |
(In thousands) |  | Carrying Value |  |  | Accumulated Depletion |  |  | Net Book Value |  |  | Carrying Value |  |  | Accumulated Depletion |  |  | Net Book Value |
Coal properties |  | $ | 661,680 |  |  | $ | (279,988 | ) |  | $ | 381,692 |  |  | $ | 661,812 |  |  | $ | (269,037 | ) |  | $ | 392,775 |
Aggregates properties |  |  | 8,655 |  |  |  | (3,723 | ) |  |  | 4,932 |  |  |  | 8,655 |  |  |  | (3,410 | ) |  |  | 5,245 |
Oil and gas royalty properties |  |  | 12,354 |  |  |  | (9,962 | ) |  |  | 2,392 |  |  |  | 12,354 |  |  |  | (9,600 | ) |  |  | 2,754 |
Other |  |  | 13,144 |  |  |  | (1,612 | ) |  |  | 11,532 |  |  |  | 13,150 |  |  |  | (1,612 | ) |  |  | 11,538 |
Total mineral rights, net |  | $ | 695,833 |  |  | $ | (295,285 | ) |  | $ | 400,548 |  |  | $ | 695,971 |  |  | $ | (283,659 | ) |  | $ | 412,312 |

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