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Note 5 - Diluted Net Income Per Share (Tables)
 9 Months Ended
Feb. 28, 2016
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
                         
   
Three Months
Ended
February 28,
2016
    
Three Months
Ended
March 1,
2015
    
Nine Months
Ended
February 28,
2016
    
Nine Months
Ended
March 1,
2015
  
Numerator:
                                
Net (loss) income applicable to Common Stockholders
   $ (21,190 )   $ 3,772     $ (16,370 )   $ 9,348  
                                 
Denominator:
                                
Weighted average shares for basic net (loss) income per share
     27,054       26,886       27,026       26,863  
Effect of dilutive securities:
                                
Stock options and restricted stock units
     —       477       —       451  
Weighted average shares for diluted net (loss) income per share
     27,054       27,363       27,026       27,314  
                                 
Diluted net (loss) income per share
  $ (0.78 )   $ 0.14     $ (0.61 )   $ 0.34