RELATED-PARTY TRANSACTIONS - Narrative (Details)			1 Months Ended	3 Months Ended		6 Months Ended	9 Months Ended
	May 10, 2021 USD ($)	May 09, 2021 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2021 USD ($)	Mar. 31, 2021 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2021 USD ($) $ / T owner T	Sep. 30, 2020 USD ($)
Related Party Transaction [Line Items]
Repayments of related party debt							$ 2,024,250	$ 0
Coal Valley Properties, LLC
Related Party Transaction [Line Items]
Number of owners | owner							1
Q Power LLC | Coal Reclamation Partnership
Related Party Transaction [Line Items]
Ownership percentage by noncontrolling owners			16.26%	16.26%		16.26%	16.26%
Affiliated Entity | Notes Payable, Other Payables | William Spence And Greg Beard
Related Party Transaction [Line Items]
Repayments of related party debt			$ 2,093,018
Affiliated Entity | Waste Coal Agreement (the “WCA”) | Coal Valley Sales, LLC
Related Party Transaction [Line Items]
Waste coal annual quantity committed (in ton) | T							200,000
Waste coal, handling fee (in USD per ton) | $ / T							6.07
Waste coal commitment, units in excess of annual commitment, price per unit (in USD per ton) | $ / T							1.00
Waste coal commitment, monthly payments					$ 25,000
Waste coal commitment, semi-monthly minimum payments						$ 51,000
Affiliated Entity | Management Services Agreement | William Spence
Related Party Transaction [Line Items]
Expenses from transactions with related party					$ 150,000		$ 450,000
Affiliated Entity | Management Services Agreement | Q Power LLC | William Spence
Related Party Transaction [Line Items]
Monthly management fee	$ 50,000	$ 25,000
Chief Executive Officer | Beard Aviation LLC
Related Party Transaction [Line Items]
Expenses from transactions with related party				$ 49,000			$ 69,000