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Variable Interest Entity (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Variable Interest Entity [Abstract]
Net loss	$ 92	$ 986
Aggregate provided by the Company, net	$ 79	$ 1,458

X

- 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

X

- References

No definition available.

+ Details

Name:	gne_VariableInterestEntityConsolidatedCarryingAmountAssetsAndLiabilityAbstract
Namespace Prefix:	gne_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- 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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph d
-URI https://asc.fasb.org/extlink&oid=123419778&loc=d3e5747-111685

+ Details

Name:	us-gaap_VariableInterestEntityActivityBetweenVIEAndEntityOperatingIncomeOrLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration