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Employees' Rights Upon Retirement (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Employees' Rights Upon Retirement [Abstract]    
Accrued severance pay $ 1,517 $ 1,712
Less - amounts funded (presented in "investment and other non-current assets'') (1,439) (1,642)
Unfunded balance $ 78 $ 70