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Commitments and Contingencies (Details Textual) - USD ($)		1 Months Ended	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 29, 2023	Jun. 30, 2021	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2021	Mar. 12, 2021
Commitments and Contingencies (Textual)
Future purchase commitments			$ 170,362,000		$ 170,362,000
Future purchase commitments			170,400,000		170,400,000
Genie Retail Energy [Member]
Commitments and Contingencies (Textual)
Aggregate performance bond outstanding			19,400,000		19,400,000
Electricity [Member]
Commitments and Contingencies (Textual)
Future purchase commitments			148,100,000		148,100,000
Purchase of Electricity expenses			31,200,000	$ 19,600,000	32,600,000	$ 34,300,000
Renewable energy credits [Member]
Commitments and Contingencies (Textual)
Future purchase commitments			22,300,000		22,300,000
Purchase of renewable energy credit			2,100,000	4,200,000	13,700,000	15,700,000
BP [Member]
Commitments and Contingencies (Textual)
Trade accounts payable			19,800,000		19,800,000
Trade Accounts Receivable [Member]
Commitments and Contingencies (Textual)
Assets pledged as collateral to BP Energy			65,600,000		65,600,000
Restricted Cash [Member]
Commitments and Contingencies (Textual)
Assets pledged as collateral to BP Energy			300,000		300,000
State of Connecticut Public Utilities Regulatory Authority [Member] | Residents Energy [Member] | Settlement Agreement [Member]
Commitments and Contingencies (Textual)
Gross revenue							$ 200,000
Accrued payables for customer complaints		$ 300,000
Loss Contingency, Penalty period for marketing activities		36 months
Settlement payment amount								$ 1,500,000
Office of the Attorney General of the State of Illinois [Member] | Residents Energy [Member] | Settlement Agreement [Member]
Commitments and Contingencies (Textual)
Loss contingency damages sought, value	$ 50,000
Gross revenue			$ 13,500,000	$ 8,200,000	$ 37,500,000	$ 22,600,000

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