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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, 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.

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- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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