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Note 4 - Diluted Net Income Per Share - Diluted Net Income Per Share (Details) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Aug. 30, 2015
Aug. 31, 2014
Numerator:    
Net income applicable to Common Stockholders $ 2,952 $ 2,353
Denominator:    
Weighted average shares for basic net income per share (in shares) 27,005 26,840
Effect of dilutive securities:    
Stock options and restricted stock units (in shares) 404 427
Weighted average shares for diluted net income per share (in shares) 27,409 27,267
Diluted net income per share (in dollars per share) $ 0.11 $ 0.09