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Business Segment Information (Details 1) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
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Summary total assets for the business segments |  |  |
Total assets | $ 155,815 | $ 152,928 | $ 158,843
Genie Retail Energy [Member] |  |  |
Summary total assets for the business segments |  |  |
Total assets | 80,177 | 78,254 | 76,691
Genie Oil and Gas [Member] |  |  |
Summary total assets for the business segments |  |  |
Total assets | 17,770 | 48,899 | 36,596
Afek Oil And Gas Ltd [Member] |  |  |
Summary total assets for the business segments |  |  |
Total assets | 38,665 | 6,243 | 5,597
Corporate [Member] |  |  |
Summary total assets for the business segments |  |  |
Total assets | $ 19,203 | $ 19,532 | $ 39,959

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