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Note 7 - Supplemental Balance Sheet Information - Property, Plant and Equipment (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Mar. 31, 2023
Land | $ 889 | $ 889 |
Buildings and building improvements | 23,280 | 23,480 |
Manufacturing equipment | 22,694 | 19,540 |
Computer equipment | 3,093 | 3,613 |
Other | 7,188 | 5,383 |
Construction in progress | 1,610 | 1,380 |
Gross total | 58,754 | 54,285 |
Accumulated depreciation | (26,421) | (22,519) |
Total property, plant and equipment, net | 32,333 | 31,766 |
Depreciation, Total | 5,382 | 4,233 | $ 4,313
Cost of Sales [Member] |  |  |
Depreciation, Total | 3,160 | 3,031 | 3,163
Operating Expense [Member] |  |  |
Depreciation, Total | $ 2,222 | $ 1,202 | $ 1,150

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