Note 7 - Diluted Net Income Per Share (Details) - Diluted Net Income Per Share (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Aug. 25, 2013	Aug. 26, 2012
Diluted Net Income Per Share [Abstract]
Net income applicable to Common Stockholders (in Dollars)	$ 4,752	$ 4,366
Weighted average shares for basic net income per share	26,452	25,670
Effect of dilutive securities:
Stock options and restricted stock units	629	542
Weighted average shares for diluted net income per share	27,081	26,212
Diluted net income per share (in Dollars per share)	$ 0.18	$ 0.17