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v3.23.1

Related Party Transactions (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2023 | Mar. 31, 2022
IDT [Member] |  |
Summary of related party transactions |  |
Amount charged the Company | $ 322 | $ 406
Amount the Company charged IDT | 37 | 37
Rafael [Member] |  |
Summary of related party transactions |  |
Amount charged the Company |  | $ 58

X
- Definition Reduction of selling, general and administrative expenses resulting from transactions with related party. + References No definition available. + Details
Name: | gne_RelatedPartyTransactionReductionOfSellingGeneralAndAdministrativeExpensesFromTransactionsWithRelatedParty
Namespace Prefix: | gne_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

X
- Definition Amount of selling, general and administrative expenses resulting from transactions, excluding transactions that are eliminated in consolidated or combined financial statements, with related party. + References No definition available. + Details
Name: | us-gaap_RelatedPartyTransactionSellingGeneralAndAdministrativeExpensesFromTransactionsWithRelatedParty
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_RelatedPartyTransactionAxis=gne_IdtCorporationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionAxis=gne_RafaelHoldingsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |