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Revenue Recognition (Details 1) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Disaggregation of Revenue [Line Items]
Electricity	$ 67,292	$ 66,189	$ 181,141	$ 163,636
Natural Gas	3,702	2,787	34,492	26,045
Other	848	497	1,911	1,445
Total	71,842	69,473	217,544	191,126
Non-Commercial Channel [Member]
Disaggregation of Revenue [Line Items]
Electricity	63,904	65,740	172,819	163,183
Natural Gas	3,177	2,191	30,876	25,448
Other
Total	67,081	67,931	203,695	188,631
Commercial Channel [Member]
Disaggregation of Revenue [Line Items]
Electricity	3,388	449	8,322	453
Natural Gas	525	596	3,616	597
Other
Total	3,913	1,045	11,938	1,050
Other [Member]
Disaggregation of Revenue [Line Items]
Electricity
Natural Gas
Other	848	497	1,911	1,445
Total	$ 848	$ 497	$ 1,911	$ 1,445

X

- Definition

Revenue from selling electricity supply in a retail access program.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount, after sales adjustments, returns, allowances, and discounts, of revenue classified as other.

+ References

No definition available.

+ Details

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X

- Definition

Revenue from sale of oil and gas purchased from other sources.

+ References

No definition available.

+ Details

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Namespace Prefix:	gne_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 32
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8933-108599

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599

+ Details

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- Details

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X

- Details

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- Details

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