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Note 6 - Stockholders' Equity - Stock-based Compensation Activity (Details) - $ / shares	12 Months Ended
	May 27, 2018	May 28, 2017	May 29, 2016
Balance (in shares)	155,239	465,968	881,143
Balance (in dollars per share)	$ 13.58
Granted (in shares)	(698,288)	(370,522)	(443,175)
Awarded/Exercised (in shares)
Awarded/Exercised (in shares)
Forfeited (in shares)	85,324		28,000
Forfeited (in shares)		(59,793)
Plan shares expired (in shares)
Balance (in shares)	542,275	155,239	465,968
Balance (in shares)	1,955,335
Balance (in dollars per share)	$ 13.80	$ 13.58
Forfeited (in shares)		59,793
Plan shares expired (in shares)
Additional shares reserved (in shares)	1,000,000
Restricted Stock [Member]
Balance (in shares)	509,355	526,841	392,771
Balance (in dollars per share)	$ 13.53	$ 13.51	$ 14.15
Granted (in shares)	200,288	130,522	177,675
Granted (in dollars per share)	$ 13.12	$ 13.37	$ 12.10
Awarded/Exercised (in shares)	270,656	130,508	32,439
Awarded/Exercised (in shares)	(270,656)	(130,508)	(32,439)
Awarded/Exercised (in dollars per share)	$ 14.06	$ 13.42	$ 13.28
Forfeited (in shares)	(30,950)	(17,500)	(11,166)
Forfeited (in dollars per share)	$ 11.75	$ 12.46	$ 14.36
Plan shares expired (in shares)
Balance (in shares)	408,037	509,355	526,841
Balance (in dollars per share)	$ 12.99	$ 13.53	$ 13.51
Granted (in dollars per share)	$ 13.12	$ 13.37	$ 12.10
Forfeited (in shares)	30,950	17,500	11,166
Employee Stock Option [Member]
Balance (in shares)	1,571,542	1,731,474	1,736,718
Balance (in dollars per share)	$ 13.20	$ 11.90	$ 11.19
Granted (in shares)	498,000	240,000	265,500
Granted (in dollars per share)	$ 12.93	$ 11.58	$ 12.04
Awarded/Exercised (in shares)	(29,333)	(357,639)	(220,717)
Awarded/Exercised (in dollars per share)	$ 7.36	$ 5.93	$ 6.44
Forfeited (in shares)	(23,334)	(42,293)	(24,473)
Forfeited (in dollars per share)	$ 12.55	$ 12.16	$ 14.38
Plan shares expired (in shares)	(61,540)		(25,554)
Plan shares expired (in dollars per share)	$ 14.23		$ 9.86
Balance (in shares)	1,955,335	1,571,542	1,731,474
Balance (in dollars per share)	$ 13.20	$ 13.20	$ 11.90

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