Note 8 - Stockholders' Equity - Cash Dividends Declared (Details) - $ / shares					3 Months Ended		6 Months Ended
	Jan. 20, 2023	Oct. 20, 2022	Jan. 21, 2022	Oct. 20, 2021	Feb. 28, 2023	Feb. 28, 2022	Feb. 28, 2023	Feb. 28, 2022
CASH DIVIDENDS DECLARED PER COMMON SHARE (in dollars per share)	$ 0.07	$ 0.07	$ 0.07	$ 0.07	$ 0.07	$ 0.07	$ 0.14	$ 0.14
Date of record	Feb. 01, 2023	Nov. 03, 2022	Feb. 02, 2022	Nov. 03, 2021
Date to be paid	Feb. 15, 2023	Nov. 16, 2022	Feb. 16, 2022	Nov. 17, 2021