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Geographic and Product Data (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 28, 2012 | Dec. 30, 2011 | Dec. 31, 2010
Net sales | $ 63,783 |  | $ 62,765 |  | $ 54,958 |
United States [Member] |  |  |  |  |  |
Net sales | 12,427 |  | 13,852 |  | 14,957 |
Japan [Member] |  |  |  |  |  |
Net sales | 16,692 |  | 15,690 |  | 13,607 |
Korea [Member] |  |  |  |  |  |
Net sales | 6,713 |  | 8,142 |  | 6,082 |
China [Member] |  |  |  |  |  |
Net sales | 8,406 |  | 6,354 |  | 3,910 |
Others [Member] |  |  |  |  |  |
Net sales | $ 19,545 | [1] | $ 18,727 | [1] | $ 16,402 | [1]
[1] | No other location individually exceeds 5% 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=6880815&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
Name: | us-gaap_SalesRevenueNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration