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Basis of Presentation (Details) | 3 Months Ended | 6 Months Ended
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Sep. 30, 2013 | Mar. 31, 2013 | Sep. 30, 2012 | Mar. 31, 2012 | Jun. 30, 2014 IDT Energy [Member] | Jun. 30, 2014 Genie Oil and Gas [Member] | Jun. 30, 2014 Genie Energy International Corporation [Member] | Jun. 30, 2014 American Shale Oil L.L.C [Member] | Jun. 30, 2014 Israel Energy Initiatives [Member] | Jun. 30, 2014 Afek Oil and Gas Ltd. [Member] | Jun. 30, 2014 Genie Mangolia [Member]
Basis Of Presentation Textual [Abstract] |  |  |  |  |  |  |  |  |  |  |
Company's investment, ownership percentage in subsidiary |  |  |  |  | 100.00% | 92.00% | 99.30% | 44.90% | 87.90% | 88.50% | 89.90%
Deferred stock units granted to directors and employees represent obligation percentage of equity |  |  |  |  | 1.40% |  |  |  |  |  |
Percentage of gas revenue generated in given period |  | 49.00% |  | 47.00% |  |  |  |  |  |  |
Percentage of electricity revenue generated in given period | 31.00% |  | 34.00% |  |  |  |  |  |  |  |

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