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Note 12 - Quarterly Consolidated Financial Information (Unaudited) - Summary of Unaudited Quarterly Results of Operations (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	May 27, 2018	Feb. 25, 2018	Nov. 26, 2017	Aug. 27, 2017	May 28, 2017	Feb. 26, 2017	Nov. 27, 2016	Aug. 28, 2016	May 27, 2018	May 28, 2017	May 29, 2016
Revenues	$ 141,076	$ 144,909	$ 122,461	$ 115,781	$ 121,265	$ 129,292	$ 110,164	$ 109,055	$ 524,227	$ 469,776	$ 476,918
Gross profit	24,809	19,806	14,921	18,802	19,120	22,873	17,103	20,116	78,338	79,212	66,781
Net income from continuing operations	6,711	16,281	414	2,355	2,596	3,591	765	3,183	25,761	10,135	(11,990)
Net income applicable to common stockholders	$ 6,108	$ 16,088	$ 487	$ 2,146	$ 2,452	$ 3,500	$ 1,326	$ 3,312	$ 24,829	$ 10,590	$ (11,641)
Net income per basic share from continuing operations (in dollars per share)	$ 0.24	$ 0.59	$ 0.02	$ 0.08	$ 0.09	$ 0.13	$ 0.03	$ 0.12	$ 0.93	$ 0.37	$ (0.45)
Net income per diluted share from continuing operations (in dollars per share)	$ 0.24	$ 0.58	$ 0.02	$ 0.08	$ 0.09	$ 0.13	$ 0.03	$ 0.11	$ 0.92	$ 0.36	$ (0.45)

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