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PROPERTY, PLANT AND EQUIPMENT - Net Book Value of Property, Plant and Equipment (Details) - USD ($) $ in Thousands | Jun. 30, 2025 | Dec. 31, 2024
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PROPERTY, PLANT AND EQUIPMENT |  |
Total Property, Plant and Equipment | $ 139,225 | $ 137,868
Mineral rights and properties |  |
PROPERTY, PLANT AND EQUIPMENT |  |
Total Property, Plant and Equipment | 8,972 | 8,972
Buildings |  |
PROPERTY, PLANT AND EQUIPMENT |  |
Total Property, Plant and Equipment | 3,183 | 3,243
Other property, plant and equipment |  |
PROPERTY, PLANT AND EQUIPMENT |  |
Total Property, Plant and Equipment | 3,995 | 2,377
Construction in progress |  |
PROPERTY, PLANT AND EQUIPMENT |  |
Total Property, Plant and Equipment | 123,075 | 123,276
Alabama |  |
PROPERTY, PLANT AND EQUIPMENT |  |
Total Property, Plant and Equipment | 139,214 | 137,855
Alabama | Mineral rights and properties |  |
PROPERTY, PLANT AND EQUIPMENT |  |
Total Property, Plant and Equipment | 8,972 | 8,972
Alabama | Buildings |  |
PROPERTY, PLANT AND EQUIPMENT |  |
Total Property, Plant and Equipment | 3,183 | 3,243
Alabama | Other property, plant and equipment |  |
PROPERTY, PLANT AND EQUIPMENT |  |
Total Property, Plant and Equipment | 3,984 | 2,364
Alabama | Construction in progress |  |
PROPERTY, PLANT AND EQUIPMENT |  |
Total Property, Plant and Equipment | 123,075 | 123,276
Corporate |  |
PROPERTY, PLANT AND EQUIPMENT |  |
Total Property, Plant and Equipment | 11 | 13
Corporate | Other property, plant and equipment |  |
PROPERTY, PLANT AND EQUIPMENT |  |
Total Property, Plant and Equipment | $ 11 | $ 13

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