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Geographic areas and major customers (Sales By Geographic Region) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales attributable based on geographic location	[1]	$ 100,347	$ 82,738	$ 75,622
North America [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales attributable based on geographic location		65,590	54,537	53,712
Europe [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales attributable based on geographic location		24,208	16,331	11,421
Asia Pacific [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales attributable based on geographic location		$ 10,549	$ 11,870	$ 10,489
[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.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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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

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