Note 10 - Debt (Details) - Long-term Debt (USD $) In Thousands, unless otherwise specified	Nov. 24, 2013	May 26, 2013
Debt Instrument [Line Items]
Debt balance	$ 37,177	$ 40,305
Less current portion	(5,989)	(5,933)	[1]
Long-term portion	31,188	34,372	[1]
Real Estate Loan [Member]
Debt Instrument [Line Items]
Debt balance	16,606	17,065
Capital Equipment Loan [Member]
Debt Instrument [Line Items]
Debt balance	10,266	11,080
Term Note [Member]
Debt Instrument [Line Items]
Debt balance	7,500	9,000
Industrial Revenue Bonds [Member]
Debt Instrument [Line Items]
Debt balance	$ 2,805	$ 3,160

[1] Derived from audited financial statements.