Note 13 - Employee Stock Option and Retirement Plans (Details) - Summary of Stock Option Activity (USD $)	3 Months Ended
	Nov. 30, 2013
Note 13 - Employee Stock Option and Retirement Plans (Details) - Summary of Stock Option Activity [Line Items]
Number outstanding	4,729,000
Weighted average exercise price per share (in Dollars per share)	$ 75.95
Granted, Number outstanding	72,203
Exercised	(136,000)
Exercised (in Dollars per share)	$ 59.38
Forfeited	(10,000)
Forfeited (in Dollars per share)	$ 79.22
Number outstanding	4,655,000
Weighted average exercise price per share (in Dollars per share)	$ 76.94
Non-Performance Based [Member]
Note 13 - Employee Stock Option and Retirement Plans (Details) - Summary of Stock Option Activity [Line Items]
Granted, Number outstanding	36,000
Granted, Weighted average exercise price per share (in Dollars per share)	$ 108.64
Performance Based [Member]
Note 13 - Employee Stock Option and Retirement Plans (Details) - Summary of Stock Option Activity [Line Items]
Granted, Number outstanding	36,000
Granted, Weighted average exercise price per share (in Dollars per share)	$ 110.31