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Selected Statement of Operations Data (Details 2) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income: |  |  |
Interest on bank deposits and short-term investments | $ 219 | $ 208 | $ 75
Non-dollar currency gains - net | 89 |  | 415
Income from marketable securities | 165 | 77 | 136
Realized gain from sale of available-for-sale securities | 24 | 28 |
Interest on available-for-sale securities |  | 27 | 42
Other Nonoperating Income | 497 | 340 | 668
Expenses: |  |  |
Non-dollar currency losses - net |  | (107) |
Realized loss from sale of available-for-sale securities |  |  | (24)
Bank commissions and charges | (14) | (11) | (14)
Other Nonoperating Expense | (14) | (118) | (38)
Financial income (expense) - net | $ 483 | $ 222 | $ 630

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