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Note 10 - Property, Plant and Equipment | 6 Months Ended
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Sep. 30, 2025
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 September 30, 2025 and March 31, 2025 are as follows (in thousands):
|  | September 30, 2025 |  |  | March 31, 2025 |
Land |  | $ | 22,650 |  |  | $ | 22,650 |
Construction in progress – equipment |  |  | 601 |  |  |  | 1,371 |
Buildings |  |  | 7,986 |  |  |  | 7,528 |
Equipment and software |  |  | 49,969 |  |  |  | 47,774 |
Furniture and fixtures |  |  | 1,728 |  |  |  | 1,672 |
Leasehold improvements |  |  | 8,256 |  |  |  | 7,969 |
Property, plant and equipment, gross |  |  | 91,190 |  |  |  | 88,964 |
Less accumulated depreciation |  |  | (52,234 | ) |  |  | (50,392 | )
Property, plant and equipment, net |  | $ | 38,956 |  |  | $ | 38,572 |
Depreciation expense was $0.9 million and $0.8 million for the three months ended September 30, 2025 and 2024, respectively. Depreciation expense was $1.8 million and $1.4 million for the six months ended September 30, 2025 and 2024, respectively.

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