Note F - Property, Plant and Equipment (Details Textual)	9 Months Ended
	Dec. 31, 2021 USD ($)	May 25, 2021 USD ($) ft² a	Mar. 31, 2021 USD ($)
Construction in Progress, Gross	$ 12,983,850		$ 9,614
Accumulated Depreciation, Depletion and Amortization, Wrote-off	2,060,226
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment, Ending Balance	25,671,208		$ 30,180,893
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		$ 21,000,000
Construction in Progress, Gross	12,983,850
Payments for Construction in Process	7,383,850
Construction in Progress Expenditures Incurred but Not yet Paid	5,600,000
Facility in Sinton, Texas [Member]
Area of Real Estate Property (Square Foot) | ft²		70,000
Decatur Facility Equipment [Member]
Proceeds from Sale of Machinery and Equipment	160,542
Property, Plant and Equipment, Gross, Ending Balance	3,604,209
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment, Ending Balance	$ 3,447,465