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Note F - Property, Plant and Equipment (Details Textual) | Dec. 31, 2023 USD ($) | Mar. 31, 2023 USD ($) | Oct. 31, 2022 USD ($) | May 25, 2021 USD ($) ft² a
--- | --- | --- | --- | ---
Buildings and Improvements, Gross | $ 29,266,000 | $ 28,550,000 |  |
Construction in Progress, Gross | 4,174,000 | $ 1,167,000 |  |
Capital Expenditures, Expected Cost | 3,800,000 |  |  |
Facility in Sinton, Texas [Member] |  |  |  |
Area of Land (Acre) | a |  |  |  | 26.5
Lessee, Operating Lease, Term of Contract (Year) |  |  |  | 99 years
Annual Rental Payment |  |  |  | $ 1
Capitalized Property Plant and Equipment [Member] |  |  |  |
Buildings and Improvements, Gross |  |  | $ 22,200,000 |
Facility in Sinton, Texas [Member] |  |  |  |
Area of Real Estate Property (Square Foot) | ft² |  |  |  | 70,000
Building Expansion Project [Member] |  |  |  |
Construction in Progress, Gross | 4,200,000 |  |  |
Upgrade of Decatur, AL Processing Line [Member] |  |  |  |
Construction in Progress, Gross | 1,500,000 |  |  |
Repair and Expansion of Storage Yard at Decatur Facility [Member] |  |  |  |
Construction in Progress, Gross | $ 1,800,000 |  |  |

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- Definition Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147478964/842-20-50-3 + Details
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