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Geographic areas and major customers (Sales By Geographic Region) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]      
Sales attributable based on geographic location [1] $ 133,753 $ 125,690 $ 100,347
North America [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Sales attributable based on geographic location 108,024 100,434 65,590
Europe [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Sales attributable based on geographic location 21,038 20,156 24,208
Asia Pacific [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Sales attributable based on geographic location $ 4,691 $ 5,100 $ 10,549
[1] Including sales to related parties in the amount of US$ 762 thousand, US$ 1,275 thousand and US$ 1,063 thousand in 2016, 2017 and 2018, respectively.