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Note 14 - Financial Instruments and Fair Value Measurements (Tables)
3 Months Ended
Mar. 29, 2015
Fair Value Disclosures [Abstract]  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
   

March 29, 2015

   

December 28, 2014

 

Short-Term Investments

               

Commercial paper

  $ 11,984     $ 23,984  

Corporate bonds

    33,681       21,693  

Certificates of deposit

    480       961