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Note 6 - Property, Plant and Equipment (Details Textual) $ in Thousands | 12 Months Ended |
--- | --- | ---
Mar. 31, 2024 USD ($) | Mar. 31, 2023 USD ($) | Oct. 31, 2022 USD ($) ft² a
Buildings and Improvements, Gross | $ 30,900 | $ 28,550 |
Construction in Progress, Gross | 1,977 | 1,167 |
Capital Expenditures, Expected Cost | 2,200 |  |
Depreciation | 3,070 | $ 2,526 |
Facility in Sinton, Texas [Member] |  |  |
Area of Land (Acre) | a |  |  | 26.5
Lessee, Operating Lease, Term of Contract (Month) |  |  | 99 years
Annual Rental Payment |  |  | $ 1,000
Capitalized Property Plant and Equipment [Member] |  |  |
Buildings and Improvements, Gross |  |  | $ 22,200
Facility in Sinton, Texas [Member] |  |  |
Area of Real Estate Property (Square Foot) | ft² |  |  | 70,000
Repair and Expansion of Storage Yard at Decatur Facility [Member] |  |  |
Construction in Progress, Gross | $ 1,800 |  |

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