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Supplementary Balance Sheet Information (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Cash, cash equivalents and deposits [Abstract]        
Cash $ 1,389 $ 2,744    
Cash equivalents 314 159    
Total cash 2,739 5,014 $ 9,165 $ 11,475
Short term deposits 8,714 6,102    
Long term deposit 98 101    
Total $ 11,551 $ 11,217