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Intangible Assets, Net (Tables) | 12 Months Ended
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Dec. 31, 2018
Intangible Assets, Net [Abstract] |
Intangible Assets, Net |
|  | December 31, |
|  | 2018 |  |  | 2017 |
|  | U.S. Dollars (in thousands) |
Patent registration costs |  |  | 1,605 |  |  |  | 1,513 |
Accumulated amortization |  |  | 1,129 |  |  |  | 1,031 |
Total intangible asset, net |  |  | 476 |  |  |  | 482 |
Estimated Amortization Expense | As of December 31, 2018, the estimated amortization expenses of intangible assets for the years 2019 to 2023 is as follows:
Year ended December 31, |  | U.S. Dollars (in thousands) |
2019 |  |  | 76 |
2020 |  |  | 74 |
2021 |  |  | 74 |
2022 |  |  | 68 |
2023 |  |  | 56 |
|  |  | 348 |

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