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Note 11 - Earnings Per Share (Tables)
 12 Months Ended
Dec. 30, 2017
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
(in
thousands, except per share amounts
)
  
201
7
    
201
6
    
201
5
  
Numerator:
  
 
 
 
  
 
 
 
  
 
 
 
Net income as reported
   $
119,519
     $
104,488
     $
80,866
  
                         
Denominator:
  
 
 
 
  
 
 
 
  
 
 
 
Weighted average shares outstanding
                        
Basic
    
22,687
      
22,559
      
22,565
  
Effect of dilutive securities
    
244
      
168
      
154
  
Diluted
    
22,931
      
22,727
      
22,719
  
                         
Earnings Per Share:
  
 
 
 
  
 
 
 
  
 
 
 
Basic earnings per share
   $
5.27
     $
4.63
     $
3.58
  
Diluted earnings per share
   $
5.21
     $
4.60
     $
3.56