Note 6 - Employee Benefit Plans (Details) - Components of Net Periodic Benefit Cost (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Aug. 30, 2014	Aug. 31, 2013	Aug. 25, 2012
Pension Plan [Member]
Note 6 - Employee Benefit Plans (Details) - Components of Net Periodic Benefit Cost [Line Items]
Service cost	$ 172	$ 178	$ 152
Interest cost	328	268	322
Expected return on assets	(183)	(198)	(199)
Amortization of prior service cost	62	62	62
Amortization of unrecognized loss	113	138	65
Other events	72	44	43
Net periodic benefit cost	564	492	445
Supplemental Executive Retirement Plan [Member]
Note 6 - Employee Benefit Plans (Details) - Components of Net Periodic Benefit Cost [Line Items]
Service cost	615	547	512
Interest cost	942	912	858
Amortization of prior service cost	368	368	368
Amortization of unrecognized loss	151	104	107
Net periodic benefit cost	$ 2,076	$ 1,931	$ 1,845