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Note 13 - Stockholders' Equity (Tables)
9 Months Ended
Feb. 24, 2013
Schedule of Stockholders Equity [Table Text Block]
   
February 24, 2013
 
Common Stock Shares
     
Balance at May 27, 2012
    25,644,580  
Stock options exercised, net of shares tendered
    250,584  
Vested restricted stock units, net of shares tendered
    11,248  
Balance at February 24, 2013
    25,906,412  
         
Common Stock
       
Balance at May 27, 2012
  $ 26  
Stock options exercised, net of shares tendered
     
Vested restricted stock units, net of shares tendered
     
Balance at February 24, 2013
  $ 26  
         
Additional Paid-in Capital
       
Balance at May 27, 2012
  $ 119,894  
Stock options exercised, net of shares tendered
    1,385  
Taxes paid by Company for RSUs vested
    (49 )
Stock-based compensation expense
    1,135  
Tax-benefit from stock based compensation expense
    2,743  
Balance at February 24, 2013
  $ 125,108  
Retained Earnings
     
Balance at May 27, 2012
  $ 29,822  
Net income
    18,068  
Balance at February 24, 2013
  $ 47,890  
         
Non controlling Interest
       
Balance at May 27, 2012
  $ 1,816  
Non controlling interest in net income
    159  
Distributions to non controlling interest
    (320 )
Balance at February 24, 2013
  $ 1,655