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Supplementary Balance Sheet Information (Details 2) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Accounts payable and accruals - other:    
Payroll and related expenses $ 797 $ 899
Government institutions 645 218
Accrued vacation pay 91 79
Accrued expenses and sundry 515 305
Accounts payable and accruals - other $ 2,048 $ 1,501