Note 2 - Earning Per Share - Schedule of Basic and Diluted Earnings Per Share (Details) - USD ($)	3 Months Ended		6 Months Ended
	Nov. 30, 2024	Nov. 30, 2023	Nov. 30, 2024	Nov. 30, 2023
Net income (loss) attributable to common stockholders	$ (345,297)	$ 818,354	$ (157,925)	$ 2,416,374
Basic (in shares)	28,279,701	28,279,701	28,279,701	28,279,701
Basic (in dollars per share)	$ (0.01)	$ 0.03	$ (0.01)	$ 0.09
Weighted-average shares outstanding - basic (in shares)	28,279,701	28,279,701	28,279,701	28,279,701
Incremental shares from assumed conversion of options warrants and preferred stock, as appropriate (in shares)	0	495,079	0	494,861
Weighted average common stock outstanding - diluted (in shares)	28,279,701	28,774,780	28,279,701	28,774,562
Income Per Share of Common Stock - (in dollars per share)	$ (0.01)	$ 0.03	$ (0.01)	$ 0.08