RELATED-PARTY TRANSACTIONS - Amounts Due to Related Parties (Details) - USD ($)	Dec. 31, 2021	Dec. 31, 2020
Related Party Transaction [Line Items]
Due to related parties	$ 1,430,660	$ 698,338
Affiliated Entity \| Coal Valley Properties, LLC
Related Party Transaction [Line Items]
Due to related parties	134,452	188,338
Affiliated Entity \| Q Power LLC
Related Party Transaction [Line Items]
Due to related parties	500,000	510,000
Affiliated Entity \| Coal Valley Sales, LLC
Related Party Transaction [Line Items]
Due to related parties	202,334	$ 0
Affiliated Entity \| Panther Creek Energy Services
Related Party Transaction [Line Items]
Due to related parties	94,434
Affiliated Entity \| Panther Creek Fuel Services
Related Party Transaction [Line Items]
Due to related parties	47,967
Affiliated Entity \| Northampton Generating Co LP
Related Party Transaction [Line Items]
Due to related parties	321,738
Affiliated Entity \| Olympus Services LLC
Related Party Transaction [Line Items]
Due to related parties	$ 129,735

Carrying amount as of the balance sheet date of obligations due all related parties.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant