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Note 6 - Stockholders' Equity (Tables)
 9 Months Ended
Sep. 30, 2017
Notes Tables  
Schedule of Stockholders Equity [Table Text Block]
   
Thirty-nine weeks ended
  
   
September 30,
2017
    
October 1,
2016
  
                 
                 
Beginning balance
   $
99,112
     $
99,414
  
Stock-based compensation
    
2,681
      
2,259
  
Shares issued under employee stock plans
    
(465
 )    
(513
 )
Adoption of new accounting standards
    
822
      
-
  
Share repurchase and retirement
    
(998
 )    
(1,469
 )
Other comprehensive income (loss)
    
1,104
      
(2,023
 )
Net income
    
2,673
      
1,058
  
Other    
1
      
(2
 )
Ending balance
   $
104,930
     $
98,724