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Note 6 - Goodwill and Other Intangibles (Tables) | 6 Months Ended
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Sep. 30, 2022
Notes Tables |
Schedule of Goodwill [Table Text Block] |
|  | Goodwill |
March 31, 2021 |  | $ | 34,634 |
Neeltran Acquisition |  |  | 8,837 |
March 31, 2022 |  | $ | 43,471 |
Less impairment loss |  |  | - |
September 30, 2022 |  | $ | 43,471 |
Schedule of Finite-Lived Intangible Assets [Table Text Block] |
|  | September 30, 2022 |  |  | March 31, 2022 |  |  |  |  |
|  | Gross Amount |  |  | Accumulated Amortization |  |  | Net Book Value |  |  | Gross Amount |  |  | Accumulated Amortization |  |  | Net Book Value |  |  | Estimated Useful Life |
Licenses |  | $ | 3,610 |  |  | $ | (3,610 | ) |  |  | — |  |  | $ | 3,610 |  |  | $ | (3,610 | ) |  |  | — |  |  |  | 7 |
Backlog |  | $ | 681 |  |  | $ | (668 | ) |  | $ | 13 |  |  | $ | 681 |  |  | $ | (631 | ) |  | $ | 50 |  |  |  | 2 |
Trade name and trademarks |  |  | 1,800 |  |  |  | — |  |  |  | 1,800 |  |  |  | 1,800 |  |  |  | — |  |  |  | 1,800 |  |  | Indefinite |
Customer relationships |  |  | 9,600 |  |  |  | (3,845 | ) |  |  | 5,755 |  |  |  | 9,600 |  |  |  | (2,723 | ) |  |  | 6,877 |  |  |  | 7 |
Core technology and know-how |  |  | 5,970 |  |  |  | (3,627 | ) |  |  | 2,343 |  |  |  | 5,970 |  |  |  | (3,386 | ) |  |  | 2,584 |  |  |  | 5-10 |
Intangible assets |  | $ | 21,661 |  |  | $ | (11,750 | ) |  | $ | 9,911 |  |  | $ | 21,661 |  |  | $ | (10,350 | ) |  | $ | 11,311 |  |  |  |  |
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] |
Years ended March 31, |  | Total |
2023 |  |  | 1,384 |
2024 |  |  | 2,158 |
2025 |  |  | 1,648 |
2026 |  |  | 1,221 |
2027 |  |  | 1,085 |
Thereafter |  |  | 615 |
Total |  | $ | 8,111 |

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