Note 6 - Employee Benefit Plans (Details) - Amounts Recorded in Consolidated Balance Sheet (USD $) In Thousands, unless otherwise specified	Aug. 30, 2014	Aug. 31, 2013	Aug. 25, 2012
Note 6 - Employee Benefit Plans (Details) - Amounts Recorded in Consolidated Balance Sheet [Line Items]
Accumulated other comprehensive loss	$ (5,244)	$ (4,118)	$ (4,373)
Pension Plan [Member]
Note 6 - Employee Benefit Plans (Details) - Amounts Recorded in Consolidated Balance Sheet [Line Items]
Deferred tax assets	1,097	913
Accrued liabilities	3,747	3,015
Accumulated other comprehensive loss	(1,753)	(1,458)
Supplemental Executive Retirement Plan [Member]
Note 6 - Employee Benefit Plans (Details) - Amounts Recorded in Consolidated Balance Sheet [Line Items]
Deferred tax assets	2,193	1,665
Accrued liabilities	21,284	18,110
Accumulated other comprehensive loss	$ (3,503)	$ (2,660)