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Selected Statement of Operations Data (Tables) | 12 Months Ended
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Dec. 31, 2020
Disclosure Text Block Supplement [Abstract] |
Schedule of revenues classified by product lines |
|  | Years Ended December 31, |
|  | 2 0 2 0 |  |  | 2 0 1 9 |  |  | 2 0 1 8 |
|  | U.S. dollars in thousands |
Product line “A” |  | $ | 11,986 |  |  | $ | 13,591 |  |  | $ | 14,923 |
Product line “B” |  |  | 2,642 |  |  |  | 2,956 |  |  |  | 3,212 |
Product line “C” |  |  | 8,746 |  |  |  | 6,117 |  |  |  | - |
|  | $ | 23,374 |  |  | $ | 22,664 |  |  | $ | 18,135 |
Schedule of geographical revenues classified by geographical location of the customers |
|  | Years Ended December 31, |
|  | 2 0 2 0 |  |  | 2 0 1 9 |  |  | 2 0 1 8 |
|  | U.S. dollars in thousands |
The Americas |  | $ | 10,355 |  |  | $ | 12,030 |  |  | $ | 13,130 |
Europe |  |  | 11,734 |  |  |  | 8,839 |  |  |  | 3,328 |
Israel |  |  | 893 |  |  |  | 1,272 |  |  |  | 884 |
Other |  |  | 392 |  |  |  | 523 |  |  |  | 793 |
|  | $ | 23,374 |  |  | $ | 22,664 |  |  | $ | 18,135 |
Schedule of financial income (expense) - net |
|  | Years Ended December 31, |
|  | 2 0 2 0 |  |  | 2 0 1 9 |  |  | 2 0 1 8 |
|  | U.S. dollars in thousands |
Income: |  |  |  |  |  |  |  |  |
Interest on bank deposits and short-term investments |  | $ | 172 |  |  | $ | 219 |  |  | $ | 208 |
Non-dollar currency gains, net |  |  | 147 |  |  |  | 89 |  |  |  | - |
Income from marketable securities |  |  | 83 |  |  |  | 165 |  |  |  | 77 |
Realized gain from sale of available-for-sale securities |  |  | - |  |  |  | 24 |  |  |  | 28 |
Interest on available-for-sale securities |  |  | - |  |  |  | - |  |  |  | 27 |
|  |  | 402 |  |  |  | 497 |  |  |  | 340 |
Expenses: |  |  |  |  |  |  |  |  |  |  |  |
Non-dollar currency losses, net |  |  | - |  |  |  | - |  |  |  | (107 | )
Bank commissions and charges |  |  | (23 | ) |  |  | (14 | ) |  |  | (11 | )
|  |  | (23 | ) |  |  | (14 | ) |  |  | (118 | )
|  | $ | 379 |  |  | $ | 483 |  |  | $ | 222 |
Schedule of earnings per ordinary share (''EPS'') |
|  | Years Ended December 31, |
|  | 2 0 2 0 |  |  | 2 0 1 9 |  |  | 2 0 1 8 |
|  | In thousands |
Weighted average number of shares issued and outstanding - used in computation of basic EPS |  |  | 19,907 |  |  |  | 19,746 |  |  |  | 19,344 |
Add - incremental shares from assumed exercise of options |  |  | 231 |  |  |  | 216 |  |  |  | 217 |
Weighted average number of shares used in computation of diluted EPS |  |  | 20,138 |  |  |  | 19,962 |  |  |  | 19,561 |

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