Note 10 - Stockholder's Equity (Details Textual) - $ / shares													3 Months Ended		6 Months Ended
	Mar. 06, 2024	Dec. 11, 2023	Sep. 12, 2023	Jun. 06, 2023	Apr. 04, 2023	Mar. 13, 2023	Dec. 07, 2022	Mar. 04, 2021	Feb. 22, 2019	May 22, 2017	Aug. 18, 2015	May 06, 2013	May 31, 2024	May 31, 2023	May 31, 2024	May 31, 2023
Common Stock, Dividends, Per Share, Declared		$ 0.01					$ 0.02						$ 0.01	$ 0.01	$ 0.03	$ 0.03
Preferred Stock Dividends Number of Rights Declared												1
Preferred Stock Dividends Number of Rights Minimum Percent of Common Stock that must be Acquired to Make Rights Exercisable												15.00%
Preferred Stock Dividends Number of Rights Minimum Percent of Common Stock that Must be Acquired to Make Rights Exercisable, Institutional Investors												20.00%
Right to Purchase Series A Preferred Stock [Member]
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right												0.01
Class of Warrant or Right, Exercise Price of Warrants or Rights												$ 0.9
Class of Warrant or Right, Term					14 years			11 years	9 years	7 years	5 years
Quarterly Dividend [Member]
Common Stock, Dividends, Per Share, Declared	$ 0.01		$ 0.01	$ 0.01		$ 0.01