Note 4 - Property, Plant and Equipment - Summary of Property, Plant and Equipment (Details) - USD ($)	Nov. 30, 2024	May 31, 2024
Property, Plant and Equipment, Gross	$ 77,489,567	$ 73,023,030
Less: Accumulated depreciation and amortization	(45,800,130)	(42,956,911)
Net Property, Plant and Equipment	31,689,437	30,066,119
Machinery and Equipment [Member]
Property, Plant and Equipment, Gross	71,307,457	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	1,709,846	1,658,751
Furniture and Fixtures [Member]
Property, Plant and Equipment, Gross	$ 542,057	$ 542,057