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Note 10 - Property, Plant and Equipment | 9 Months Ended
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Dec. 31, 2023
Notes to Financial Statements |
Property, Plant and Equipment Disclosure [Text Block] | 10. Property, Plant and Equipment The cost and accumulated depreciation of property, plant and equipment at December 31, 2023 and March 31, 2023 are as follows (in thousands):
|  | December 31, 2023 |  |  | March 31, 2023 |
Land |  | $ | 980 |  |  | $ | 980 |
Construction in progress - equipment |  |  | 245 |  |  |  | 748 |
Buildings |  |  | 5,416 |  |  |  | 5,416 |
Equipment and software |  |  | 44,203 |  |  |  | 43,156 |
Finance lease - right of use asset |  |  | — |  |  |  | 1 |
Furniture and fixtures |  |  | 1,537 |  |  |  | 1,535 |
Leasehold improvements |  |  | 6,897 |  |  |  | 6,815 |
Property, plant and equipment, gross |  |  | 59,278 |  |  |  | 58,651 |
Less accumulated depreciation |  |  | (48,073 | ) |  |  | (46,342 | )
Property, plant and equipment, net |  | $ | 11,205 |  |  | $ | 12,309 |
Depreciation expense was $0.6 million and $0.6 million for the three months ended December 31, 2023 and 2022, respectively. Depreciation expense was $1.7 million and $2.0 million for the nine months ended December 31, 2023 and 2022, respectively.

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