Note 2 - Earning Per Share - Schedule of Basic and Diluted Earnings Per Share (Details) - USD ($)	3 Months Ended		9 Months Ended
	Feb. 28, 2025	Feb. 29, 2024	Feb. 28, 2025	Feb. 29, 2024
Net income (loss) attributable to common stockholders	$ 849,867	$ 151,456	$ 691,942	$ 2,567,830
Basic (in shares)	28,097,494	28,279,701	28,220,051	28,279,701
Basic (in dollars per share)	$ 0.03	$ 0.01	$ 0.02	$ 0.09
Weighted-average shares outstanding - basic (in shares)	28,097,494	28,279,701	28,220,051	28,279,701
Incremental shares from assumed conversion of options warrants and preferred stock, as appropriate (in shares)	495,099	495,455	495,892	495,000
Weighted average common stock outstanding - diluted (in shares)	28,592,593	28,775,156	28,715,943	28,774,701
Diluted (in dollars per share)	$ 0.03	$ 0.01	$ 0.02	$ 0.09