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Geographic and Product Data (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 01, 2016	Jul. 03, 2015	Jul. 01, 2016	Jul. 03, 2015
Geographic And Sales [Line Items]
Net sales	$ 20,974	$ 18,657	$ 40,243	$ 37,514
Japan [Member]
Geographic And Sales [Line Items]
Net sales	3,989	3,980	8,229	8,267
China [Member]
Geographic And Sales [Line Items]
Net sales	4,417	3,327	7,495	5,698
United States [Member]
Geographic And Sales [Line Items]
Net sales	2,420	2,723	4,936	5,589
Korea [Member]
Geographic And Sales [Line Items]
Net sales	1,665	1,269	3,687	3,612
Spain [Member]
Geographic And Sales [Line Items]
Net sales	1,528	1,486	2,980	2,964
France [Member]
Geographic And Sales [Line Items]
Net sales	1,103	888	2,230	2,039
Germany [Member]
Geographic And Sales [Line Items]
Net sales	1,153	694	2,120	1,190
Other [Member]
Geographic And Sales [Line Items]
Net sales	$ 4,699	$ 4,290	$ 8,566	$ 8,155

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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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