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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

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