Note 6 - Long-term Debt and Capital Leases - Long-Term Debt and Capital Lease Obligations (Details) - USD ($)	Aug. 30, 2016	May 31, 2016	May 14, 2012
Senior Notes [Member]
Senior unsecured notes	$ 212,546,000	$ 212,546,000
Unamortized discount	(1,675,000)	(1,771,000)	$ (3,700,000)
Unamortized debt issuance costs	(2,832,000)	(2,995,000)
Senior unsecured notes less unamortized discount and debt issuance costs	208,039,000	207,780,000
Unamortized debt issuance costs	(58,000)	(74,000)
Mortgage loan obligations	15,258,000	15,745,000
Unamortized premium - mortgage loan obligations	47,000	75,000
Capital lease obligations	223,000	211,000
Total long-term debt and capital leases	223,509,000	223,737,000
Less current maturities	9,781,000	9,934,000
Long-term debt and capital leases, less current maturities	$ 213,728,000	$ 213,803,000