Note 4 - Property, Plant and Equipment - Summary of Property, Plant and Equipment (Details) - USD ($)	Feb. 29, 2024	May 31, 2023
Property, Plant and Equipment, Gross	$ 72,116,848	$ 70,527,909
Less: Accumulated depreciation and amortization	(41,522,562)	(37,343,203)
Net Property, Plant and Equipment	30,594,286	33,184,706
Machinery and Equipment [Member]
Property, Plant and Equipment, Gross	67,786,046	66,068,625
Plant Buildings and Land [Member]
Property, Plant and Equipment, Gross	2,164,232	2,364,089
Leasehold Improvements [Member]
Property, Plant and Equipment, Gross	1,624,513	1,553,138
Furniture and Fixtures [Member]
Property, Plant and Equipment, Gross	$ 542,057	$ 542,057