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Supplementary Balance Sheet Information (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Cash, cash equivalents and deposits [Abstract]    
Cash $ 2,681 $ 1,389
Cash eqivalents 3,798 314
Total cash and cash equivalents 6,479 2,739
Short-term bank deposits 6,795 8,714
Long-term bank deposit $ 0 $ 98