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Business Segment Information (Details 1) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012
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Summary total assets for the business segments |  |
Total assets | $ 146,176 | $ 150,306
IDT Energy [Member] |  |
Summary total assets for the business segments |  |
Total assets | 68,722 | 65,377
Genie Oil and Gas [Member] |  |
Summary total assets for the business segments |  |
Total assets | 37,044 | 36,561
Corporate [Member] |  |
Summary total assets for the business segments |  |
Total assets | $ 40,410 | $ 48,368

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