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Employees' Rights Upon Retirement (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Employees' Rights Upon Retirement [Abstract]    
Accrued severance pay $ 1,712 $ 1,687
Less - amounts funded (presented in ''investment and other non-current assets'') (1,642) (1,565)
Unfunded balance $ 70 $ 122