Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($) $ in Thousands	Nov. 26, 2016	Aug. 27, 2016
Receivables, reserves	$ 9,974	$ 7,675
Accumulated depreciation	$ 674,102	$ 661,295
Preferred stock, par value (in dollars per share)	$ 1	$ 1
Preferred stock, shares authorized (in shares)	2,000,000	2,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common Class A [Member]
Common stock, par value (in dollars per share)	$ 0.10	$ 0.10
Common stock, shares authorized (in shares)	30,000,000	30,000,000
Common stock, shares issued (in shares)	15,433,608	15,415,125
Common stock, shares outstanding (in shares)	15,433,608	15,415,125
Common Class B [Member]
Common stock, par value (in dollars per share)	$ 0.10	$ 0.10
Common stock, shares authorized (in shares)	20,000,000	20,000,000
Common stock, shares issued (in shares)	4,845,519	4,849,519
Common stock, shares outstanding (in shares)	4,845,519	4,849,519