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Supplementary Balance Sheet Information (Details 3) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Accounts payable and accruals - other:    
Payroll and related expenses $ 507 $ 702
Government institutions 208 348
Accrued vacation pay 52 67
Accrued expenses and sundry 70 116
Accounts payable and accruals - other $ 837 $ 1,233