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Note 4 - Diluted Net Income Per Share (Tables)
 9 Months Ended
Feb. 26, 2017
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Three Months Ended
    
Nine Months Ended
  
   
February 26,
2017
    
February 28,
2016
    
February 26,
2017
    
February 28,
2016
  
Numerator:
                                
Net income
(loss) applicable to Common Stockholders
   $
3,500
     $
(21,190
)
   $
8,138
     $
(16,370
)
                                 
Denominator:
                                
Weighted average shares for basic net income per share
    
27,286
      
27,054
      
27,252
      
27,026
  
Effect of dilutive securities:
                                
Stock options and restricted stock units
    
396
      
—
      
356
      
—
  
Weighted average shares for diluted net income per share
    
27,682
      
27,054
      
27,608
      
27,026
  
                                 
Diluted net income
(loss) per share
  $
0.13
     $
(0.78
)
   $
0.29
     $
(0.61
)