Note 7 - Employee Benefit Plans (Details) - The components of net periodic benefit cost (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Aug. 31, 2013	Aug. 25, 2012	Aug. 27, 2011
Pension Plans [Member]
Note 7 - Employee Benefit Plans (Details) - The components of net periodic benefit cost [Line Items]
Service cost	$ 178	$ 152	$ 149
Interest cost	268	322	328
Expected return on assets	(198)	(199)	(202)
Amortization of prior service cost	62	62	62
Amortization of unrecognized loss	138	65	78
Other events	44	43	65
Net periodic benefit cost	492	445	480
Supplemental Executive Retirement Plan [Member]
Note 7 - Employee Benefit Plans (Details) - The components of net periodic benefit cost [Line Items]
Service cost	547	512	486
Interest cost	912	858	764
Amortization of prior service cost	368	368	368
Amortization of unrecognized loss	104	107	131
Net periodic benefit cost	$ 1,931	$ 1,845	$ 1,749