XML 52 R29.htm IDEA: XBRL DOCUMENT v2.4.0.8

Basis of Presentation (Details)	3 Months Ended				9 Months Ended				9 Months Ended
	Sep. 30, 2012	Mar. 31, 2012	Sep. 30, 2011	Mar. 31, 2011	Sep. 30, 2013 IDT Energy [Member]	Sep. 30, 2013 Genie Oil and Gas [Member]	Sep. 30, 2013 Genie Energy International Corporation [Member]	Sep. 30, 2013 American Shale Oil L.L.C [Member]	Sep. 30, 2013 Israel Energy Initiatives [Member]	Sep. 30, 2013 Afek Oil and Gas Ltd. [Member]
Basis of Presentation (Textual)
Company's investment, ownership percentage in subsidiary					100.00%	92.00%	99.30%		88.60%	89.00%
Deferred stock units granted to directors and employees represent obligation percentage of equity					2.30%
Ownership interest hold by subsidiary								50.00%
Percentage of gas revenue generated in given period		47.00%		50.00%
Percentage of electricity revenue generated in given period	34.00%		35.00%

X

- Details

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

X

- Definition

Deferred stock units granted represent Obligation percentage of equity.

+ References

No definition available.

+ Details

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

X

- Definition

Percentage Of Electricity Revenue Generated In Given Period.

+ References

No definition available.

+ Details

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

X

- Definition

Percentage of gas revenue generated in given period.

+ References

No definition available.

+ Details

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

X

- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571

+ Details

Name:	us-gaap_EquityMethodInvestmentOwnershipPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Percentage of subsidiary's or equity method investee's stock owned by parent immediately after all stock transactions.

+ References

No definition available.

+ Details

Name:	us-gaap_SubsidiaryOrEquityMethodInvesteeCumulativePercentageOwnershipAfterAllTransactions
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration