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Business Segment Information (Details 1) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Summary total assets for the business segments    
Total assets $ 124,393 $ 121,813
GRE [Member]    
Summary total assets for the business segments    
Total assets 89,382 87,539
Afek [Member]    
Summary total assets for the business segments    
Total assets 8,179 6,685
GOGAS [Member]    
Summary total assets for the business segments    
Total assets 10,487 12,224
Corporate [Member]    
Summary total assets for the business segments    
Total assets $ 16,345 $ 15,365