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Geographic areas and major customers (Sales By Geographic Region) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]      
Sales attributable based on geographic location $ 128,460 $ 107,398 $ 105,240
USA [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Sales attributable based on geographic location 88,556 64,503 76,081
North America - other [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Sales attributable based on geographic location 964 639 1,080
Israel [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Sales attributable based on geographic location 9,936 12,362 11,983
Europe [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Sales attributable based on geographic location 19,383 23,208 8,973
Asia-Pacific [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Sales attributable based on geographic location $ 9,621 $ 6,686 $ 7,123