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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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