Note 11 - Common Stock and Earnings Per Share (Details) (USD $)	0 Months Ended	1 Months Ended	12 Months Ended									1 Months Ended
	May 14, 2013	Jun. 30, 2013	Aug. 31, 2013 Employee Stock Option [Member]	Aug. 31, 2012 Employee Stock Option [Member]	Aug. 31, 2011 Employee Stock Option [Member]	Aug. 31, 2013 Restricted Stock [Member]	Aug. 31, 2012 Restricted Stock [Member]	Aug. 31, 2011 Restricted Stock [Member]	Aug. 31, 2013 Performance-Based Stock Options [Member]	Aug. 31, 2012 Performance-Based Stock Options [Member]	Aug. 31, 2011 Performance-Based Stock Options [Member]	Jun. 30, 2013 Per Annum [Member]
Note 11 - Common Stock and Earnings Per Share (Details) [Line Items]
Percent Increase in Dividend	13.00%
Common Stock, Dividends, Per Share, Cash Paid (in Dollars per share)		$ 0.35										$ 1.40
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount			6,408	383,058	2,670	30,456	30,456	11,284	1,202,685	1,710,017	1,672,975