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Supplementary Balance Sheet Information (Details 2) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Other:    
Nontrade Receivables, Current $ 176 $ 213
Government of Israel [Member]    
Other:    
Nontrade Receivables, Current 10 19
Employees [Member]    
Other:    
Nontrade Receivables, Current 8 26
Sundry [Member]    
Other:    
Nontrade Receivables, Current $ 158 $ 168