Note 4 - Property, Plant and Equipment - Summary of Property, Plant and Equipment (Details) - USD ($)	Aug. 31, 2024	May 31, 2024
Property, Plant and Equipment, Gross	$ 76,470,401	$ 73,023,030
Less: Accumulated depreciation and amortization	(44,213,742)	(42,956,911)
Net Property, Plant and Equipment	32,256,659	30,066,119
Machinery and Equipment [Member]
Property, Plant and Equipment, Gross	70,339,386	68,532,989
Plant Buildings and Land [Member]
Property, Plant and Equipment, Gross	3,930,207	2,289,233
Leasehold Improvements [Member]
Property, Plant and Equipment, Gross	1,658,751	1,658,751
Furniture and Fixtures [Member]
Property, Plant and Equipment, Gross	$ 542,057	$ 542,057