Note 11 - Common Stock and Earnings Per Share (Details) - Shares of Common Stock Outstanding	3 Months Ended
	Nov. 30, 2013	Nov. 30, 2012
Shares of Common Stock Outstanding [Abstract]
Balance at September 1	43,324,410	44,279,000
Common stock issued for employee stock plans	194,000	333,000
Repurchase of common stock under the share repurchase program	(530,000)	(270,000)
Balance at November 30, 2013 and 2012, respectively	42,988,369	44,342,000