Note 10 - Stockholders' Equity - Cash Dividends Declared (Details) - $ / shares			3 Months Ended		6 Months Ended
	Jan. 21, 2022	Oct. 20, 2021	Feb. 28, 2022	Feb. 28, 2021	Feb. 28, 2022	Feb. 28, 2021
Amount (in dollars per share)	$ 0.07	$ 0.07	$ 0.07	$ 0.065	$ 0.14	$ 0.065
Record date	Feb. 02, 2022	Nov. 03, 2021
Payable date	Feb. 16, 2022	Nov. 17, 2021