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Consolidated Statements of Operations (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Stock-based compensation included in selling, general and administrative expenses	$ 899	$ 840

X

- Definition

Amount of expense for award under share-based payment arrangement. Exclude amount capitalized.

+ References

No definition available.

+ Details

Name:	gne_AllocatedShareBasedCompensationExpenses
Namespace Prefix:	gne_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration