Note F - Property, Plant and Equipment (Details Textual)	9 Months Ended
	Dec. 31, 2022 USD ($)	Mar. 31, 2022 USD ($)	May 25, 2021 ft² a
Construction in Progress, Gross	$ 832,761	$ 15,925,306
Facility in Sinton, Texas [Member]
Area of Land (Acre) | a			26.5
Lessee, Operating Lease, Term of Contract (Year)			99 years
Capital Expenditures, Expected Cost	22,300,000
Construction in Progress, Gross	14,826,000
Construction in Progress Expenditures Incurred but Not yet Paid	$ 7,448,000
Facility in Sinton, Texas [Member]
Area of Real Estate Property (Square Foot) | ft²			70,000