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CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Stock-based compensation included in selling, general and administrative expenses	$ 649	$ 713	$ 2,254	$ 2,232

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- 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