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Supplementary Balance Sheet Information (Details 1) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Accounts receivable other:    
Accounts receivable other $ 577 $ 560
Interest Receivable [Member]    
Accounts receivable other:    
Accounts receivable other 70 85
Government institutions [Member]    
Accounts receivable other:    
Accounts receivable other 213 229
Employees [Member]    
Accounts receivable other:    
Accounts receivable other 47 19
Sundry [Member]    
Accounts receivable other:    
Accounts receivable other $ 247 $ 229