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Intangible Assets, Net (Tables)
 12 Months Ended
Dec. 28, 2012
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Finite-Lived Intangible Assets [Table Text Block]

Intangible assets, net, consisted of the following (in thousands):

 

  December 28, 2012  December 30, 2011 
  Gross
Carrying
Amount		  Accumulated
Amortization		  Net  Gross
Carrying
Amount		  Accumulated
Amortization		  Net 
Amortized intangible assets:                        
Patents and licenses $10,786  $(9,875) $911  $10,868  $(9,508) $1,360 
Customer relationships  1,835   (917)  918   2,023   (809)  1,214 
Developed technology  1,166   (853)  313   1,286   (871)  415 
Total $13,787  $(11,645) $2,142  $14,177  $(11,188) $2,989
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]

The following table shows estimated amortization expense for intangible assets for each of the next five succeeding years (in thousands):

 

Fiscal Year Amount 
2013 $477 
2014  428 
2015  296 
2016  294 
2017  290 
Thereafter  357 
Total $2,142