Note 7 - Leases - Summary of Lease Activity (Details) - USD ($)	6 Months Ended
	Nov. 30, 2023	Nov. 30, 2022
Amortization of right-of-use assets	$ 15,397	$ 180,240
Interest on lease liabilities	1,085	25,261
Operating lease expense	328,070	190,343
Short-term lease expense	801,548	783,360
Total	1,146,100	1,179,204
Operating cash flows	1,085	25,261
Financing cash flows	20,008	549,029
Operating cash flows	$ 328,070	$ 190,343
Financing leases (Year)	1 year 4 months 24 days	1 year 10 months 24 days
Operating leases (Year)	13 years 7 months 6 days	14 years 7 months 6 days
Financing leases	4.20%	4.70%
Operating leases	6.00%	6.00%