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Geographic and Product Data (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 30, 2016 | Jan. 01, 2016 | Jan. 02, 2015
Geographic And Sales [Line Items] |  |  |  |
Net sales |  | $ 82,432 | $ 77,123 | $ 74,987
Japan [Member] |  |  |  |
Geographic And Sales [Line Items] |  |  |  |
Net sales |  | 17,329 | 16,982 | 19,107
China [Member] |  |  |  |
Geographic And Sales [Line Items] |  |  |  |
Net sales |  | 16,019 | 12,571 | 9,370
United States [Member] |  |  |  |
Geographic And Sales [Line Items] |  |  |  |
Net sales |  | 9,859 | 10,904 | 11,117
Korea [Member] |  |  |  |
Geographic And Sales [Line Items] |  |  |  |
Net sales |  | 7,455 | 8,061 | 6,563
Other [Member] |  |  |  |
Geographic And Sales [Line Items] |  |  |  |
Net sales | [1] | $ 31,770 | $ 28,605 | $ 28,830
[1] | No other location individually exceeds 10% of total sales.

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