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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, 2017
Dec. 31, 2016
Dec. 31, 2015
Revenue, Major Customer [Line Items]      
Sales [1] $ 125,690 $ 100,347 $ 82,738
Customer A [Member]      
Revenue, Major Customer [Line Items]      
Sales 25,888 [2] [2]
Customer B [Member]      
Revenue, Major Customer [Line Items]      
Sales 16,915 17,366 16,320
Customer C [Member]      
Revenue, Major Customer [Line Items]      
Sales [2] $ 11,628 [2]
[1] Including sales to related parties in the amount of US$ 1,154 thousand, US$ 762 thousand and US$ 1,275 thousand in 2015, 2016 and 2017, respectively.
[2] Less than 10% of sales.