Note 6 - Leases - Summary of Lease Activity (Details) - USD ($)	12 Months Ended
May 31, 2025	May 31, 2024
Amortization of right-of-use assets	$ 4,887	$ 24,312
Interest on lease liabilities	487	1,719
Operating lease expense	636,755	609,976
Short-term lease expense	1,506,817	1,512,438
Total	2,148,946	2,148,445
Operating cash flows	487	26,031
Financing cash flows	18,686	37,342
Operating cash flows	610,291	583,807
Operating leases	$ 0	$ 354,041
Operating leases (Year)	8 months 12 days	1 year 2 months 12 days
Financing leases (Year)	11 years 8 months 12 days	12 years 8 months 12 days
Financing leases	3.00%	4.00%
Operating leases	6.10%	6.10%

Amount of interest expense on finance lease liability.

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Amount of interest paid on finance lease liability.

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Amount of cash outflow for principal payment on finance lease.

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Amount of amortization expense attributable to right-of-use asset from finance lease.

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Weighted average remaining lease term for finance lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of lease cost recognized by lessee for lease contract.

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Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability.

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Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use.

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Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of increase in right-of-use asset obtained in exchange for operating lease liability.

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Amount of short-term lease cost, excluding expense for lease with term of one month or less.

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