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Note 12 - Quarterly Consolidated Financial Information (unaudited) - Summary of Unaudited Quarterly Results of Operations (Details) - USD ($) $ in Thousands	3 Months Ended												12 Months Ended
	May. 31, 2015	Mar. 01, 2015	Nov. 30, 2014	Aug. 31, 2014	May. 25, 2014	Feb. 23, 2014	Nov. 24, 2013	Aug. 25, 2013	May. 26, 2013	Feb. 24, 2013	Nov. 25, 2012	Aug. 26, 2012	May. 31, 2015	May. 25, 2014	May. 26, 2013
Revenues	$ 134,448	$ 138,530	$ 132,665	$ 133,614	$ 120,929	$ 126,379	$ 120,026	$ 109,479	$ 107,113	$ 117,867	$ 114,654	$ 102,074	$ 539,257	$ 476,813	$ 441,708
Gross profit	18,668	16,885	15,666	14,188	16,143	20,155	13,734	12,532	13,030	17,508	18,459	13,763	65,407	62,564	62,760
Net income (loss)	$ 4,196	$ 3,772	$ 3,223	$ 2,353	$ 4,542	$ 6,400	$ 3,451	$ 4,752	$ 4,519	$ 4,789	$ 8,913	$ 4,366	$ 13,544	$ 19,145	$ 22,587
Net income per basic share (in dollars per share)	$ 0.16	$ 0.14	$ 0.12	$ 0.09	$ 0.17	$ 0.24	$ 0.13	$ 0.18	$ 0.17	$ 0.19	$ 0.35	$ 0.17	$ 0.50	$ 0.72	$ 0.87
Net income per diluted share (in dollars per share)	$ 0.15	$ 0.14	$ 0.12	$ 0.09	$ 0.17	$ 0.24	$ 0.13	$ 0.18	$ 0.17	$ 0.18	$ 0.34	$ 0.17	$ 0.50	$ 0.71	$ 0.85

X

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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