Note 7 - Leases - Summary of Lease Activity (Details) - USD ($)	9 Months Ended
	Feb. 29, 2024	Feb. 28, 2023
Amortization of right-of-use assets	$ 21,470	$ 189,927
Interest on lease liabilities	1,415	30,614
Operating lease expense	454,893	335,378
Short-term lease expense	1,205,951	1,217,095
Total	1,683,729	1,773,014
Operating cash flows	1,415	30,614
Financing cash flows	11,650	626,329
Operating cash flows	$ 467,182	$ 335,378
Financing leases (Year)	1 year	1 year 10 months 24 days
Operating leases (Year)	13 years 4 months 24 days	14 years 4 months 24 days
Financing leases	4.80%	4.40%
Operating leases	6.00%	6.00%