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PROPERTY, PLANT AND EQUIPMENT - Net Book Value of Property, Plant and Equipment (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
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PROPERTY, PLANT AND EQUIPMENT |  |
Total Property, Plant and Equipment | $ 137,868 | $ 132,400
Mineral rights and properties |  |
PROPERTY, PLANT AND EQUIPMENT |  |
Total Property, Plant and Equipment | 8,972 | 8,972
Other property, plant and equipment |  |
PROPERTY, PLANT AND EQUIPMENT |  |
Total Property, Plant and Equipment | 5,620 | 5,863
Construction in progress |  |
PROPERTY, PLANT AND EQUIPMENT |  |
Total Property, Plant and Equipment | 123,276 | 117,565
Alabama |  |
PROPERTY, PLANT AND EQUIPMENT |  |
Total Property, Plant and Equipment | 137,855 | 132,382
Alabama | Mineral rights and properties |  |
PROPERTY, PLANT AND EQUIPMENT |  |
Total Property, Plant and Equipment | 8,972 | 8,972
Alabama | Other property, plant and equipment |  |
PROPERTY, PLANT AND EQUIPMENT |  |
Total Property, Plant and Equipment | 5,607 | 5,845
Alabama | Construction in progress |  |
PROPERTY, PLANT AND EQUIPMENT |  |
Total Property, Plant and Equipment | 123,276 | 117,565
Corporate |  |
PROPERTY, PLANT AND EQUIPMENT |  |
Total Property, Plant and Equipment | 13 | 18
Corporate | Other property, plant and equipment |  |
PROPERTY, PLANT AND EQUIPMENT |  |
Total Property, Plant and Equipment | $ 13 | $ 18

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