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Geographic areas and major customers (Sales to Single Customers Exceeding 10% of Sales) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |
Sales | [1] | $ 105,240 |  | $ 133,753 |  | $ 125,690 |
Customer A [Member] |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |
Sales |  | 17,107 |  | 18,855 |  | 16,915 |
Customer B [Member] |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |
Sales |  | 11,030 |  | 14,506 |  |  | [2]
Customer C [Member] |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |
Sales |  |  | [2] | 14,220 |  |  | [2]
Customer D [Member] |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |
Sales |  |  | [2] |  | [2] | $ 25,888 |
[1] | Including sales to related parties in the amount of US$ 1,275 thousand, US$ 1,063 thousand and US$ 0 in 2017, 2018 and 2019, respectively.
[2] | Less than 10% of sales.

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