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Business Segments (Tables)
3 Months Ended
Mar. 30, 2013
Business Segments [Abstract]  
Revenue information shown by geographic region
                 
    Three Months Ended  
(in thousands)   March 30,
2013
    March 31,
2012
 

United States

  $ 4,209     $ 4,222  

Europe

    1,973       1,845  

Rest of Americas

    850       702  

Asia/Pacific Rim

    1,907       1,536  
   

 

 

   

 

 

 
    $ 8,939     $ 8,305