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Goodwill and Intangible Assets (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 29, 2014
Dec. 28, 2013
Schedule of Intangible Assets    
Gross Carrying Amount $ 960 $ 960
Accumulated Amortization 664 632
Net Carrying Amount 296 328 [1]
Patents
   
Schedule of Intangible Assets    
Gross Carrying Amount 720 720
Accumulated Amortization 600 572
Net Carrying Amount 120 148
Customer Relations
   
Schedule of Intangible Assets    
Gross Carrying Amount 240 240
Accumulated Amortization 64 60
Net Carrying Amount $ 176 $ 180
Amortization Life 11 years 2 months 12 days  
[1] Derived from the audited consolidated financial statements included in the Annual Report on Form 10-K filed with the SEC for the year ended December 28, 2013.