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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, 2021
Dec. 31, 2020
Dec. 31, 2019
Revenue, Major Customer [Line Items]      
Sales $ 128,460 $ 107,398 $ 105,240
Customer A [Member]      
Revenue, Major Customer [Line Items]      
Sales 19,184 12,278 17,107
Customer B [Member]      
Revenue, Major Customer [Line Items]      
Sales 10,145 4,225 11,030
Customer C [Member]      
Revenue, Major Customer [Line Items]      
Sales 7,788 13,468 2,428
Customer D [Member]      
Revenue, Major Customer [Line Items]      
Sales $ 7,689 $ 13,328 $ 0