Note 7 - Employee Benefit Plans (Details) - Amounts Recorded in Consolidated Balance Sheet - USD ($) $ in Thousands	Aug. 29, 2015	Aug. 30, 2014
Pension Plan [Member]
Note 7 - Employee Benefit Plans (Details) - Amounts Recorded in Consolidated Balance Sheet [Line Items]
Deferred tax assets	$ 988	$ 1,097
Accrued liabilities	3,722	3,747
Accumulated other comprehensive loss	(1,538)	(1,753)
Supplemental Executive Retirement Plan [Member]
Note 7 - Employee Benefit Plans (Details) - Amounts Recorded in Consolidated Balance Sheet [Line Items]
Deferred tax assets	1,975	2,193
Accrued liabilities	23,285	21,284
Accumulated other comprehensive loss	$ (3,181)	$ (3,491)