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Note 13 - Stockholders' Equity (Tables)
9 Months Ended
Feb. 23, 2014
Stockholders' Equity Note [Abstract]  
Schedule of Stockholders Equity [Table Text Block]

Common Stock Shares

       

Balance at May 26, 2013

    26,402,247  

Stock options exercised, net of shares tendered

    339,968  

Vested restricted stock units, net of shares tendered

    38,058  

Balance at February 23, 2014

    26,780,273  
         

Common Stock

       

Balance at May 26, 2013

  $ 26  

Stock options exercised, net of shares tendered

    1  

Balance at February 23, 2014

  $ 27  
         

Additional Paid-in Capital

       

Balance at May 26, 2013

  $ 126,258  

Stock options exercised, net of shares tendered

    2,147  

Taxes incurred by Company for RSUs vested

    (326 )

Stock-based compensation expense

    992  

Tax-benefit from stock based compensation expense

    1,909  

Balance at February 23, 2014

  $ 130,980  
         

Retained Earnings

       

Balance at May 26, 2013

  $ 52,409  

Net income

    14,603  

Balance at February 23, 2014

  $ 67,012  
         

Non controlling Interest

       

Balance at May 26, 2013

  $ 1,721  

Non controlling interest in net income

    123  

Distributions to non controlling interest

    (226 )

Balance at February 23, 2014

  $ 1,618