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Geographic areas and major customers (Sales By Geographic Region) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Sales attributable based on geographic location | [1] | $ 107,398 | $ 105,240 | $ 133,753
North America [Member] |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Sales attributable based on geographic location |  | 65,142 | 77,161 | 108,024
Europe [Member] |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Sales attributable based on geographic location |  | 35,570 | 20,956 | 21,038
Asia Pacific [Member] |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Sales attributable based on geographic location |  | $ 6,686 | $ 7,123 | $ 4,691
[1] | Including sales to related parties in the amount of US$ 1,063 thousand, US$ 0 thousand and US$ 0 thousand in 2018, 2019 and 2020, respectively.

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