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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.