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Geographic areas and major customers (Schedule of Locations of Company's Long Lived Assets) (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long lived assets $ 13,341 $ 14,023
North America [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long lived assets 1,014 1,081
Europe [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long lived assets 340 189
ISRAEL    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long lived assets $ 11,987 $ 12,753