Note 10 - Asset Retirement Obligations (Details Textual)	12 Months Ended
	Aug. 27, 2016
Minimum [Member]
Asset Retirement Obligation, Remaining Lives	1 year
Maximum [Member]
Asset Retirement Obligation, Remaining Lives	28 years
Estimated Impact of Inflation per Year	3.00%
Credit Adjusted Risk Free Rates, Minimum Rate	7.00%
Credit Adjusted Risk Free Rates, Maximum Rate	7.50%