PROPERTY, PLANT AND EQUIPMENT - Net Book Value of Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Property, Plant and Equipment [Line Items]
Total Property, Plant and Equipment	$ 31,663	$ 14,479
Mineral rights and properties
Property, Plant and Equipment [Line Items]
Total Property, Plant and Equipment	8,972	8,972
Other property, plant and equipment
Property, Plant and Equipment [Line Items]
Total Property, Plant and Equipment	4,553	4,490
Construction in progress
Property, Plant and Equipment [Line Items]
Total Property, Plant and Equipment	18,138	1,017
Alabama
Property, Plant and Equipment [Line Items]
Total Property, Plant and Equipment	31,635	14,451
Alabama | Mineral rights and properties
Property, Plant and Equipment [Line Items]
Total Property, Plant and Equipment	8,972	8,972
Alabama | Other property, plant and equipment
Property, Plant and Equipment [Line Items]
Total Property, Plant and Equipment	4,525	4,462
Alabama | Construction in progress
Property, Plant and Equipment [Line Items]
Total Property, Plant and Equipment	18,138	1,017
Corporate
Property, Plant and Equipment [Line Items]
Total Property, Plant and Equipment	28	28
Corporate | Other property, plant and equipment
Property, Plant and Equipment [Line Items]
Total Property, Plant and Equipment	$ 28	$ 28