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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 |  |

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