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Business Segment Information (Details 1) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
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