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Supplementary Balance Sheet Information (Details 2) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Accounts payable and accruals - other:    
Payroll and related expenses $ 899 $ 507
Government institutions 218 208
Accrued vacation pay 79 52
Accrued expenses and sundry 305 70
Accounts payable and accruals - other $ 1,501 $ 837