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Employees' Rights upon Retirement (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Employees' Rights Upon Retirement (Textual)      
Severance pay expenses $ (123) $ 105 $ 68
Employee severance [Member]      
Employees' Rights Upon Retirement (Textual)      
Severance pay expenses $ 169 $ 271 $ 181