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Note 13 - Financial Instruments and Fair Value Measurements (Tables)
9 Months Ended
Sep. 30, 2015
Notes Tables  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
 
 
September 30,
 
 
December 28,
 
 
 
2015
 
 
2014
 
                 
 
(In thousands)
Short-term investments
               
Commercial paper
  $     $ 23,984  
Corporate bonds
          21,693  
Certificates of deposit
          961