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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Revenue, Major Customer [Line Items]      
Sales [1] $ 133,753 $ 125,690 $ 100,347
Customer A [Member]      
Revenue, Major Customer [Line Items]      
Sales 18,855 16,915 17,366
Customer B [Member]      
Revenue, Major Customer [Line Items]      
Sales 14,506 [2] [2]
Customer C [Member]      
Revenue, Major Customer [Line Items]      
Sales 14,220 [2] [2]
Customer D [Member]      
Revenue, Major Customer [Line Items]      
Sales [2] 25,888 [2]
Customer E [Member]      
Revenue, Major Customer [Line Items]      
Sales [2] [2] $ 11,628
[1] Including sales to related parties in the amount of US$ 762 thousand, US$ 1,275 thousand and US$ 1,063 thousand in 2016, 2017 and 2018, respectively.
[2] Less than 10% of sales.