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Note 1 - Organization, Basis of Presentation, and Summary of Significant Accounting Policies - Diluted Net Income Per Share (Details) - USD ($)
$ in Thousands
 12 Months Ended
May. 31, 2015
May. 25, 2014
May. 26, 2013
Numerator:      
Net income applicable to Common Stockholders $ 13,544 $ 19,145 $ 22,587
Denominator:      
Weighted average shares for basic net income per share (in shares) 26,884 26,628 25,830
Effect of dilutive securities:      
Stock options and restricted stock units (in shares) 452 492 796
Weighted average shares for diluted net income per share (in shares) 27,336 27,120 26,626
Diluted net income per share (in dollars per share) $ 0.50 $ 0.71 $ 0.85