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Geographic and Product Data (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 29, 2017	Dec. 30, 2016	Jan. 01, 2016
Geographic And Sales [Line Items]
Net sales		$ 90,611	$ 82,432	$ 77,123
Japan [Member]
Geographic And Sales [Line Items]
Net sales		17,424	17,329	16,982
China [Member]
Geographic And Sales [Line Items]
Net sales		23,881	16,019	12,571
United States [Member]
Geographic And Sales [Line Items]
Net sales		7,894	9,859	10,904
Korea [Member]
Geographic And Sales [Line Items]
Net sales		5,543	7,455	8,061
Other [Member]
Geographic And Sales [Line Items]
Net sales	[1]	$ 35,869	$ 31,770	$ 28,605
[1] No other location individually exceeds 10% of total 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

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