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Geographic and Product Data (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 01, 2016	Apr. 03, 2015
Geographic And Sales [Line Items]
Net sales	$ 19,269	$ 18,858
Japan [Member]
Geographic And Sales [Line Items]
Net sales	4,240	4,286
China [Member]
Geographic And Sales [Line Items]
Net sales	3,078	2,371
United States [Member]
Geographic And Sales [Line Items]
Net sales	2,516	2,867
Korea [Member]
Geographic And Sales [Line Items]
Net sales	2,023	2,343
Spain [Member]
Geographic And Sales [Line Items]
Net sales	1,453	1,478
France [Member]
Geographic And Sales [Line Items]
Net sales	1,127	1,150
Germany [Member]
Geographic And Sales [Line Items]
Net sales	967	495
Other [Member]
Geographic And Sales [Line Items]
Net sales	$ 3,865	$ 3,868

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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=26872669&loc=d3e20235-122688

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