Note 8 - Leases - Summary of Lease Activity (Details) - USD ($)	9 Months Ended
	Feb. 28, 2026	Feb. 28, 2025
Amortization of right-of-use assets	$ 3,665	$ 10,660
Interest on lease liabilities	55	432
Operating lease expense	477,120	477,715
Short-term lease expense	1,192,063	1,123,611
Total	1,672,903	1,612,418
Operating cash flows	55	432
Financing cash flows	4,457	15,440
Operating cash flows	$ 456,750	$ 458,041
Financing leases (Year)		9 months 18 days
Operating leases (Year)	11 years	12 years
Financing leases	0.00%	3.37%
Operating leases	6.11%	6.12%