Note 11 - Concentrations, Risks and Uncertainties (Details Textual) - USD ($)	3 Months Ended
	Aug. 31, 2023	Aug. 31, 2022
One Customer [Member]
Purchases From Customers	$ 211,220	$ 226,232
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Minimum [Member]
Number of Major Customers	2	2
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Maximum [Member]
Number of Major Customers	4	4
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Two to Four Customers [Member]
Concentration Risk, Percentage	85.00%	77.00%