Note 7 - Employee Benefit Plans (Details) - Amounts recorded in consolidated balance sheet (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Aug. 31, 2013	Aug. 25, 2012
Pension Plans [Member]
Note 7 - Employee Benefit Plans (Details) - Amounts recorded in consolidated balance sheet [Line Items]
Deferred tax assets	$ 913	$ 1,089
Accrued liabilities	3,015	3,187
Accumulated other comprehensive loss	(1,458)	(1,740)
Supplemental Executive Retirement Plan [Member]
Note 7 - Employee Benefit Plans (Details) - Amounts recorded in consolidated balance sheet [Line Items]
Deferred tax assets	1,665	1,648
Accrued liabilities	18,110	16,399
Accumulated other comprehensive loss	$ (2,660)	$ (2,633)