Note 7 - Leases - Summary of Lease Activity (Details) - USD ($)	9 Months Ended
	Feb. 28, 2025	Feb. 29, 2024
Amortization of right-of-use assets	$ 10,660	$ 21,470
Interest on lease liabilities	432	1,415
Operating lease expense	477,715	454,893
Short-term lease expense	1,123,611	1,205,951
Total	1,612,418	1,683,729
Operating cash flows	432	1,415
Financing cash flows	15,440	11,650
Operating cash flows	$ 458,041	$ 467,182
Financing leases (Year)	9 months 18 days	1 year
Operating leases (Year)	12 years	13 years 4 months 24 days
Financing leases	3.37%	4.80%
Operating leases	6.12%	6.00%