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PROPERTY, PLANT AND EQUIPMENT - Net Book Value of Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
Mar. 31, 2025
Dec. 31, 2024
PROPERTY, PLANT AND EQUIPMENT    
Total Property, Plant and Equipment $ 139,096 $ 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 3,213 3,243
Other property, plant and equipment    
PROPERTY, PLANT AND EQUIPMENT    
Total Property, Plant and Equipment 4,117 2,377
Construction in progress    
PROPERTY, PLANT AND EQUIPMENT    
Total Property, Plant and Equipment 122,794 123,276
Alabama    
PROPERTY, PLANT AND EQUIPMENT    
Total Property, Plant and Equipment 139,084 137,855
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 3,213 3,243
Alabama | Other property, plant and equipment    
PROPERTY, PLANT AND EQUIPMENT    
Total Property, Plant and Equipment 4,105 2,364
Alabama | Construction in progress    
PROPERTY, PLANT AND EQUIPMENT    
Total Property, Plant and Equipment 122,794 123,276
Corporate    
PROPERTY, PLANT AND EQUIPMENT    
Total Property, Plant and Equipment 12 13
Corporate | Other property, plant and equipment    
PROPERTY, PLANT AND EQUIPMENT    
Total Property, Plant and Equipment $ 12 $ 13