Note 2 - Earning Per Share - Schedule of Basic and Diluted Earnings Per Share (Details) - USD ($)	3 Months Ended
	Aug. 31, 2024	Aug. 31, 2023
Net income attributable to common stockholders	$ 187,372	$ 1,598,020
Basic (in shares)	28,279,701	28,279,701
Basic (in dollars per share)	$ 0.01	$ 0.06
Preferred Stock Dividends, Income Statement Impact	$ (0)	$ 146,199
Net income allocated to common stockholders	$ 187,372	$ 1,744,219
Incremental shares from assumed conversion of options, warrants and preferred stock, as appropriate (in shares)	496,295	3,828,053
Weighted average common stock outstanding - diluted (in shares)	28,775,996	32,107,754
Diluted (in dollars per share)	$ 0.01	$ 0.05