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Geographic areas and major customers (Schedule of Locations of Company's Long Lived Assets) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long lived assets $ 14,023 $ 7,357
North America [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long lived assets 1,081 1,189
Europe [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long lived assets 189 198
Israel [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long lived assets $ 12,753 $ 5,970