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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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