Note 4 - Property, Plant and Equipment - Summary of Property, Plant and Equipment (Details) - USD ($)	Feb. 28, 2025	May 31, 2024
Property, Plant and Equipment, Gross	$ 78,034,035	$ 73,023,030
Less: Accumulated depreciation and amortization	(47,404,023)	(42,956,911)
Net Property, Plant and Equipment	30,630,012	30,066,119
Machinery and Equipment [Member]
Property, Plant and Equipment, Gross	71,234,987	68,532,989
Net Property, Plant and Equipment	458,785
Plant Buildings and Land [Member]
Property, Plant and Equipment, Gross	3,930,207	2,289,233
Leasehold Improvements [Member]
Property, Plant and Equipment, Gross	2,326,784	1,658,751
Furniture and Fixtures [Member]
Property, Plant and Equipment, Gross	$ 542,057	$ 542,057