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Variable Interest Entity (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Variable Interest Entity [Abstract] |  |  |  |
Net loss | $ (148) | $ (336) | $ (167) | $ (700)
Aggregate funding (provided by) paid to the Company, net | $ (12) | $ (191) | $ 22 | $ (268)

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- Definition Aggregate funding repaid to (provided by) the Company, net. + References No definition available. + Details
Name: | gne_VariableInterestEntityAggregateFundingRepaidToProvidedByEntityNet
Namespace Prefix: | gne_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | gne_VariableInterestEntityConsolidatedCarryingAmountAssetsAndLiabilityAbstract
Namespace Prefix: | gne_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of income (loss) from operations derived by the reporting entity during the period from the Variable Interest Entity (VIE). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph d -Publisher FASB -URI https://asc.fasb.org//1943274/2147481203/810-10-50-6 + Details
Name: | us-gaap_VariableInterestEntityActivityBetweenVIEAndEntityOperatingIncomeOrLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration