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Selected Statement of Operations Data (Tables) | 12 Months Ended
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Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Schedule of revenues classified by product lines |
|  | Years ended December 31, |
|  | 2 0 1 9 |  |  | 2 0 1 8 |  |  | 2 0 1 7 |
|  | U.S. dollars in thousands |
Product line "A" |  | $ | 13,591 |  |  | $ | 14,923 |  |  | $ | 14,722 |
Product line "B" |  |  | 2,956 |  |  |  | 3,212 |  |  |  | 3,340 |
Product line "C" |  |  | 6,117 |  |  |  | - |  |  |  | - |
|  | $ | 22,664 |  |  | $ | 18,135 |  |  | $ | 18,062 |
Schedule of geographical revenues classified by geographical location of the customers |
|  | Years ended December 31, |
|  | 2 0 1 9 |  |  | 2 0 1 8 |  |  | 2 0 1 7 |
|  | U.S. dollars in thousands |
The Americas |  | $ | 12,030 |  |  | $ | 13,130 |  |  | $ | 12,995 |
Europe |  |  | 8,839 |  |  |  | 3,328 |  |  |  | 3,181 |
Israel |  |  | 1,272 |  |  |  | 884 |  |  |  | 977 |
Other |  |  | 523 |  |  |  | 793 |  |  |  | 909 |
|  | $ | 22,664 |  |  | $ | 18,135 |  |  | $ | 18,062 |
Schedule of financial income (expense) - net |
|  | Years ended December 31, |
|  | 2 0 1 9 |  |  | 2 0 1 8 |  |  | 2 0 1 7 |
|  | U.S. dollars in thousands |
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 |
|  |  | 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 | )
|  |  | (14 | ) |  |  | (118 | ) |  |  | (38 | )
|  | $ | 483 |  |  | $ | 222 |  |  | $ | 630 |
Schedule of earnings per ordinary share (''EPS'') |
|  | Years ended December 31, |
|  | 2 0 1 9 |  |  | 2 0 18 |  |  | 2 0 1 7 |
|  | In thousands |
Weighted average number of shares issued and outstanding - used in computation of basic EPS |  |  | 19,746 |  |  |  | 19,344 |  |  |  | 19,292 |
Add - incremental shares from assumed exercise of options |  |  | 216 |  |  |  | 217 |  |  |  | 267 |
Weighted average number of shares used in computation of diluted EPS |  |  | 19,962 |  |  |  | 19,561 |  |  |  | 19,559 |

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- Definition Tabular disclosure of the components of non-operating income or non-operating expense that may include amounts earned from dividends, interest on securities, gains (losses) on securities sold, equity earnings of unconsolidated affiliates, net gain (loss) on sales of business, interest expense and other miscellaneous income or expense items. + References No definition available. + Details
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