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Note 9 - Mineral Rights, Net (Tables) | 12 Months Ended
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Dec. 31, 2024
Notes Tables |
Mineral Properties Disclosure [Table Text Block] |
|  | December 31, |
|  | 2024 |  |  | 2023 |
(In thousands) |  | Carrying Value |  |  | Accumulated Depletion |  |  | Net Book Value |  |  | Carrying Value |  |  | Accumulated Depletion |  |  | Net Book Value |
Coal properties |  | $ | 660,961 |  |  | $ | (299,404 | ) |  | $ | 361,557 |  |  | $ | 661,256 |  |  | $ | (285,470 | ) |  | $ | 375,786 |
Aggregates properties |  |  | 8,655 |  |  |  | (4,065 | ) |  |  | 4,590 |  |  |  | 8,655 |  |  |  | (3,761 | ) |  |  | 4,894 |
Oil and gas royalty properties |  |  | 12,354 |  |  |  | (10,394 | ) |  |  | 1,960 |  |  |  | 12,354 |  |  |  | (10,082 | ) |  |  | 2,272 |
Other |  |  | 13,143 |  |  |  | (1,612 | ) |  |  | 11,531 |  |  |  | 13,143 |  |  |  | (1,612 | ) |  |  | 11,531 |
Total mineral rights, net |  | $ | 695,113 |  |  | $ | (315,475 | ) |  | $ | 379,638 |  |  | $ | 695,408 |  |  | $ | (300,925 | ) |  | $ | 394,483 |
Details of Impairment of Long-Lived Assets Held and Used by Asset [Table Text Block] |
|  | For the Year Ended December 31, |
(In thousands) |  | 2024 |  |  | 2023 |  |  | 2022 |
Coal properties (1) |  | $ | 87 |  |  | $ | 556 |  |  | $ | 4,365 |
Aggregates properties |  |  | — |  |  |  | — |  |  |  | 92 |
Total |  | $ | 87 |  |  | $ | 556 |  |  | $ | 4,457 |

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