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Intangible Assets, Net
 12 Months Ended
Dec. 28, 2012
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets Disclosure [Text Block]
Note 7 – Intangible Assets, Net
 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  
   Aggregate amortization expense for amortized intangible assets was $652,000, $797,000, and $816,000, for the years ended December 28, 2012, December 30, 2011, and December 31, 2010, respectively. 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