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Variable Interest Entity (Details Textual) - CCE [Member] $ in Millions	1 Months Ended
	Oct. 31, 2015 USD ($)
Variable Interest Entity (Textual)
Percentage of option to purchase	100.00%
Forgiveness of loan	$ 0.5
Expiration date of the option	Oct. 22, 2023

X

- Definition

Expiration date of warrants held.

+ References

No definition available.

+ Details

Name:	gne_OptionsExpirationDate
Namespace Prefix:	gne_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Variable interest entity activity between VIE and entity percentage of VIE interests subject to option.

+ References

No definition available.

+ Details

Name:	gne_VariableInterestEntityActivityBetweenVieAndEntityPercentageOfVieInterestsSubjectToOption
Namespace Prefix:	gne_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Variable interest entity option exercise loan forgiveness.

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

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

X

- Details

Name:	srt_ConsolidatedEntitiesAxis=gne_CitizensChoiceEnergyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: