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Note 11 - Common Stock and Earnings Per Share (Details Textual) - USD ($) $ / shares in Units, $ in Thousands		1 Months Ended	3 Months Ended		6 Months Ended
	Feb. 15, 2019	Mar. 19, 2019	Feb. 28, 2019	Feb. 28, 2018	Feb. 28, 2019	Feb. 28, 2018
Common Stock, Dividends, Per Share, Cash Paid	$ 0.64
Payments of Dividends, Total					$ 48,442	$ 43,406
Shares Paid for Tax Withholding for Share Based Compensation					27,852	5,563
Payments Related to Tax Withholding for Share-based Compensation					$ 6,100	$ 1,000
Employee Stock Option [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount			447,709	0	447,709	0
Restricted Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount				0		0
Performance Shares [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount			206,417	309,800	206,417	309,800
Subsequent Event [Member]
Payments of Dividends, Total		$ 24,400