Note 10 - Property, Plant and Equipment - Cost and Accumulated Depreciation of Property and Equipment (Details) - USD ($) $ in Thousands |
Sep. 30, 2026 |
Mar. 31, 2026 |
|---|---|---|
| Property, plant and equipment, gross | $ 154,770 | $ 140,487 |
| Less accumulated depreciation | (53,901) | (50,712) |
| Property, plant and equipment, net | 100,869 | 89,775 |
| Land [Member] | ||
| Property, plant and equipment, gross | 41,545 | 37,770 |
| Construction in Progress [Member] | ||
| Property, plant and equipment, gross | 4,413 | 1,482 |
| Building [Member] | ||
| Property, plant and equipment, gross | 35,151 | 30,989 |
| Equipment and Software [Member] | ||
| Property, plant and equipment, gross | 63,419 | 60,030 |
| Furniture and Fixtures [Member] | ||
| Property, plant and equipment, gross | 1,946 | 1,940 |
| Leasehold Improvements [Member] | ||
| Property, plant and equipment, gross | $ 8,296 | $ 8,276 |