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Geographic areas and major customers (Schedule of Locations of Company's Long Lived Assets) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long lived assets $ 3,670 $ 4,121
North America [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long lived assets 46 20
Europe [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long lived assets 235 225
Israel [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long lived assets $ 3,389 $ 3,876