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Note 10 - Property, Plant and Equipment | 9 Months Ended
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Dec. 31, 2022
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, 2022 and March 31, 2022 are as follows (in thousands):
|  | December 31, 2022 |  |  | March 31, 2022 |
Construction in progress - equipment |  | $ | 844 |  |  | $ | 573 |
Land |  |  | 980 |  |  |  | 980 |
Building |  |  | 5,416 |  |  |  | 5,270 |
Equipment and software |  |  | 43,938 |  |  |  | 43,668 |
Finance lease - right of use asset |  |  | 3 |  |  |  | 8 |
Furniture and fixtures |  |  | 1,530 |  |  |  | 1,379 |
Leasehold improvements |  |  | 6,650 |  |  |  | 6,634 |
Property, plant and equipment, gross |  | $ | 59,361 |  |  |  | 58,512 |
Less accumulated depreciation |  |  | (46,750 | ) |  |  | (44,856 | )
Property, plant and equipment, net |  | $ | 12,611 |  |  | $ | 13,656 |
Depreciation expense was $0.6 million and $0.7 million for the three months ended December 31, 2022 and 2021, respectively. Depreciation expense was $2.0 million for each of the nine months ended December 31, 2022 and 2021, respectively.

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