Note 10 - Stockholders' Equity - Cash Dividends Declared (Details) - $ / shares							3 Months Ended		9 Months Ended
	Apr. 21, 2023	Jan. 20, 2023	Oct. 20, 2022	Apr. 22, 2022	Jan. 21, 2022	Oct. 20, 2021	May 31, 2023	May 31, 2022	May 31, 2023	May 31, 2022
CASH DIVIDENDS DECLARED PER COMMON SHARE (in dollars per share)	$ 0.07	$ 0.07	$ 0.07	$ 0.07	$ 0.07	$ 0.07	$ 0.07	$ 0.07	$ 0.21	$ 0.21
Date of record	May 03, 2023	Feb. 01, 2023	Nov. 03, 2022	May 04, 2022	Feb. 02, 2022	Nov. 03, 2021
Payable date	May 17, 2023	Feb. 15, 2023	Nov. 16, 2022	May 18, 2022	Feb. 16, 2022	Nov. 17, 2021