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Supplementary Balance Sheet Information (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Trade:        
Open accounts $ 524 $ 1,098    
Less - allowance for doubtful accounts 0 0 $ (245) $ 0
Trade $ 524 $ 1,098