RELATED-PARTY TRANSACTIONS - Amounts Due to Related Parties (Details) - USD ($)	Mar. 31, 2022	Dec. 31, 2021
Related Party Transaction [Line Items]
Due to related parties	$ 1,499,306	$ 1,430,659
Affiliated Entity | Coal Valley Properties, LLC
Related Party Transaction [Line Items]
Due to related parties	134,452	134,452
Affiliated Entity | Q Power LLC
Related Party Transaction [Line Items]
Due to related parties	500,000	500,000
Affiliated Entity | Coal Valley Sales, LLC
Related Party Transaction [Line Items]
Due to related parties	202,333	202,333
Affiliated Entity | Panther Creek Energy Services
Related Party Transaction [Line Items]
Due to related parties	192,840	94,434
Affiliated Entity | Panther Creek Fuel Services
Related Party Transaction [Line Items]
Due to related parties	76,582	47,967
Affiliated Entity | Northampton Generating Co LP
Related Party Transaction [Line Items]
Due to related parties	136,108	321,738
Affiliated Entity | Olympus Services LLC
Related Party Transaction [Line Items]
Due to related parties	0	129,735
Affiliated Entity | Scrubgrass Energy Services, LLC
Related Party Transaction [Line Items]
Due to related parties	236,715	0
Affiliated Entity | Scrubgrass Fuel Services, LLC
Related Party Transaction [Line Items]
Due to related parties	$ 20,276	$ 0