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Selected Statement of Operations Data (Details 6) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income: |  |  |
Interest on bank deposits and short-term investments | $ 75 | $ 49 | $ 54
Non-dollar currency gains - net | 419 | 69 | 0
Income from marketable securities | 136 | 143 | 102
Realized gain from sale of available-for-sale securities |  | 0 | 0
Interest on available for sale securities | 42 | 58 | 59
Other Nonoperating Income | 672 | 319 | 215
Expenses: |  |  |
Non-dollar currency losses - net | (4) | (56) | (315)
Realized loss from sale of available-for-sale securities | (24) | (84) | 0
Bank commissions and charges | (14) | (13) | (14)
Other Nonoperating Expense | (42) | (153) | (329)
Financial income (expense) - net | $ 630 | $ 166 | $ (114)

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