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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, 2020
Dec. 31, 2019
Dec. 31, 2018
Revenue, Major Customer [Line Items]      
Sales [1] $ 107,398 $ 105,240 $ 133,753
Customer A [Member]      
Revenue, Major Customer [Line Items]      
Sales 13,468 2,428 305
Customer B [Member]      
Revenue, Major Customer [Line Items]      
Sales 13,328
Customer C [Member]      
Revenue, Major Customer [Line Items]      
Sales 12,278 17,107 18,855
Customer D [Member]      
Revenue, Major Customer [Line Items]      
Sales 4,225 11,030 14,506
Customer E [Member]      
Revenue, Major Customer [Line Items]      
Sales $ 44 $ 121 $ 14,220
[1] Including sales to related parties in the amount of US$ 1,063 thousand, US$ 0 thousand and US$ 0 thousand in 2018, 2019 and 2020, respectively.