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Geographic and Product Data (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 02, 2015	Oct. 03, 2014	Oct. 02, 2015	Oct. 03, 2014
Geographic And Sales [Line Items]
Net sales	$ 18,750	$ 18,188	$ 56,264	$ 58,414
Japan [Member]
Geographic And Sales [Line Items]
Net sales	4,249	4,792	12,514	14,349
China [Member]
Geographic And Sales [Line Items]
Net sales	3,095	2,915	8,794	7,675
United States [Member]
Geographic And Sales [Line Items]
Net sales	2,873	2,875	8,464	8,676
Korea [Member]
Geographic And Sales [Line Items]
Net sales	1,690	1,098	5,303	5,671
Spain [Member]
Geographic And Sales [Line Items]
Net sales	1,137	1,178	4,101	4,270
Germany [Member]
Geographic And Sales [Line Items]
Net sales	962	713	2,151	2,625
Other [Member]
Geographic And Sales [Line Items]
Net sales	$ 4,744	$ 4,617	$ 14,937	$ 15,148

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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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