Note 7 - Employee Benefit Plans (Details) - Components of Net Periodic Benefit Cost - USD ($) $ in Thousands	12 Months Ended
	Aug. 29, 2015	Aug. 30, 2014	Aug. 31, 2013
Pension Plan [Member]
Note 7 - Employee Benefit Plans (Details) - Components of Net Periodic Benefit Cost [Line Items]
Service cost	$ 192	$ 172	$ 178
Interest cost	294	328	268
Expected return on assets	(182)	(183)	(198)
Amortization of prior service cost	62	62	62
Amortization of unrecognized loss	152	113	138
Other events	174	72	44
Net periodic benefit cost	692	564	492
Supplemental Executive Retirement Plan [Member]
Note 7 - Employee Benefit Plans (Details) - Components of Net Periodic Benefit Cost [Line Items]
Service cost	821	615	547
Interest cost	1,133	942	912
Amortization of prior service cost	368	368	368
Amortization of unrecognized loss	461	151	104
Net periodic benefit cost	$ 2,783	$ 2,076	$ 1,931