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Geographic areas and major customers (Sales to Single Customers Exceeding 10% of Sales) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Revenue, Major Customer [Line Items]      
Sales [1] $ 105,240 $ 133,753 $ 125,690
Customer A [Member]      
Revenue, Major Customer [Line Items]      
Sales 17,107 18,855 16,915
Customer B [Member]      
Revenue, Major Customer [Line Items]      
Sales 11,030 14,506 [2]
Customer C [Member]      
Revenue, Major Customer [Line Items]      
Sales [2] 14,220 [2]
Customer D [Member]      
Revenue, Major Customer [Line Items]      
Sales [2] [2] $ 25,888
[1] Including sales to related parties in the amount of US$ 1,275 thousand, US$ 1,063 thousand and US$ 0 in 2017, 2018 and 2019, respectively.
[2] Less than 10% of sales.