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Supplementary Balance Sheet Information (Details 1) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Accounts receivable other:    
Accounts receivable other $ 560 $ 843
Government [Member]    
Accounts receivable other:    
Accounts receivable other 227 659
Employees [Member]    
Accounts receivable other:    
Accounts receivable other 19 25
Sundry [Member]    
Accounts receivable other:    
Accounts receivable other $ 314 $ 159