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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% |  |  |  |  |  |  |

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