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Note 8 - Mineral Rights, Net (Tables) | 3 Months Ended
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Mar. 31, 2025
Notes Tables |
Mineral Properties Disclosure [Table Text Block] |
|  | March 31, 2025 |  |  | December 31, 2024 |
(In thousands) |  | Carrying Value |  |  | Accumulated Depletion |  |  | Net Book Value |  |  | Carrying Value |  |  | Accumulated Depletion |  |  | Net Book Value |
Coal properties |  | $ | 653,808 |  |  | $ | (294,522 | ) |  | $ | 359,286 |  |  | $ | 660,961 |  |  | $ | (299,404 | ) |  | $ | 361,557 |
Aggregates properties |  |  | 8,655 |  |  |  | (4,139 | ) |  |  | 4,516 |  |  |  | 8,655 |  |  |  | (4,065 | ) |  |  | 4,590 |
Oil and gas royalty properties |  |  | 12,354 |  |  |  | (10,441 | ) |  |  | 1,913 |  |  |  | 12,354 |  |  |  | (10,394 | ) |  |  | 1,960 |
Other |  |  | 13,142 |  |  |  | (1,612 | ) |  |  | 11,530 |  |  |  | 13,143 |  |  |  | (1,612 | ) |  |  | 11,531 |
Total mineral rights, net |  | $ | 687,959 |  |  | $ | (310,714 | ) |  | $ | 377,245 |  |  | $ | 695,113 |  |  | $ | (315,475 | ) |  | $ | 379,638 |

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