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Business Segment Information (Details 1) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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Summary total assets for the business segments |  |
Total assets | $ 131,463 | $ 125,778
GRE [Member] |  |
Summary total assets for the business segments |  |
Total assets | 122,992 | 112,521
Afek [Member] |  |
Summary total assets for the business segments |  |
Total assets | 1,228 | 2,588
GOGAS [Member] |  |
Summary total assets for the business segments |  |
Total assets | 4,516 | 7,887
Corporate [Member] |  |
Summary total assets for the business segments |  |
Total assets | $ 2,727 | $ 2,782

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