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Commitments and Contingencies (Details Textual) - USD ($)		3 Months Ended		6 Months Ended
	Jul. 23, 2019	Jun. 30, 2020	Sep. 30, 2018	Jun. 30, 2020	Jun. 30, 2019	Feb. 06, 2020	Dec. 31, 2019
Commitments and Contingencies (Textual)
Purchase of future commitments		$ 143,858,000		$ 143,858,000
Aggregate performance bond outstanding		13,600,000		13,600,000
Payment of trade accounts payable to BP Energy		13,800		13,800
Total investigation accrual		28,652,000		28,652,000			$ 26,116,000
Settlement payment amount		2,300,000		2,300,000
Liability for the settlement payment			$ (3,000,000.0)
Amount of accrued foregoing						$ 200,000	$ 200
New York PSC [Member]
Commitments and Contingencies (Textual)
Gross revenue		11,400			$ 28,800
Town Square's Connecticut [Member]
Commitments and Contingencies (Textual)
Gross revenue		9,500			$ 17,100
IDT Energy [Member]
Commitments and Contingencies (Textual)
Gross revenue		1,600		3,400
Restitution payments amount				3,000,000.0
Genie Retail Energy [Member]
Commitments and Contingencies (Textual)
Loss contingency damages sought, value	$ 16,000,000.0
Renewable energy credits [Member]
Commitments and Contingencies (Textual)
Future purchases of electricity		2,900		6,500
Purchase of renewable energy credit				47,500
Electricities [Member]
Commitments and Contingencies (Textual)
Future purchases of electricity				96,400
Purchase of renewable energy credit		9,900		19,900
Purchase Commitments [Member]
Commitments and Contingencies (Textual)
Purchase of future commitments		143,900		143,900
BP [Member]
Commitments and Contingencies (Textual)
Advance payment		2,500,000		2,500,000
Trade Accounts Receivable [Member]
Commitments and Contingencies (Textual)
Assets pledged as collateral to BP Energy		42,000,000.0		42,000,000.0
Restricted Cash [Member]
Commitments and Contingencies (Textual)
Assets pledged as collateral to BP Energy		$ 2,700,000		$ 2,700,000

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