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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, 2016
Dec. 31, 2015
Dec. 31, 2014
Revenue, Major Customer [Line Items]      
Sales [1] $ 100,347 $ 82,738 $ 75,622
Customer A [Member]      
Revenue, Major Customer [Line Items]      
Sales 17,366 16,320 18,083
Customer B [Member]      
Revenue, Major Customer [Line Items]      
Sales $ 11,628 [2] [2]
[1] Including sales to related parties in the amount of US$ 1,041 thousand, US$ 1,154 thousand and US$ 762 thousand in 2014, 2015 and 2016, respectively.
[2] Less than 10% of sales.