Note 4 - Property, Plant and Equipment - Summary of Property, Plant and Equipment (Details) - USD ($)	Aug. 31, 2025	May 31, 2025
Property, Plant and Equipment, Gross	$ 79,351,158	$ 78,751,850
Less: Accumulated depreciation and amortization	(50,236,773)	(48,706,964)
Net Property, Plant and Equipment	29,114,385	30,044,886
Machinery and Equipment [Member]
Property, Plant and Equipment, Gross	72,350,582	71,908,843
Net Property, Plant and Equipment	374,077
Plant Buildings and Land [Member]
Property, Plant and Equipment, Gross	3,930,207	3,930,207
Leasehold Improvements [Member]
Property, Plant and Equipment, Gross	2,528,312	2,370,743
Furniture and Fixtures [Member]
Property, Plant and Equipment, Gross	$ 542,057	$ 542,057