RELATED PARTY TRANSACTIONS - Amounts Due to Related Parties (Details) - USD ($)	Mar. 31, 2024	Dec. 31, 2023
Related Party Transaction [Line Items]
Due to related parties	$ 619,947	$ 718,838
Coal Valley Sales, LLC
Related Party Transaction [Line Items]
Due to related parties	503,670	433,195
Panther Creek Operating LLC
Related Party Transaction [Line Items]
Due to related parties	0	14,511
Northampton Generating Fuel Supply Company, Inc.
Related Party Transaction [Line Items]
Due to related parties	0	226,951
Olympus Power LLC and other subsidiaries
Related Party Transaction [Line Items]
Due to related parties	32,944	44,181
William Spence
Related Party Transaction [Line Items]
Due to related parties	$ 83,333	$ 0