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Note 2 - Acquisitions - Estimated Fair Values of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Mar. 31, 2022 | May 06, 2021 | Mar. 31, 2021 | Oct. 01, 2020
--- | --- | --- | --- | --- | ---
Goodwill | $ 43,471 | $ 43,471 |  |  |
Neeltran Inc. [Member] |  |  |  |  |
Cash and short-term investments |  | 500 |  |  |
Net working capital (excluding inventory and deferred revenue) |  | (900) |  |  |
Inventory |  | 9,000 |  |  |
Property, plant and equipment |  | 6,500 |  |  |
Deferred revenue |  | (10,000) |  |  |
Deferred tax liability |  | 2,300 |  |  |
Net tangible assets/(liabilities) |  | 2,800 |  |  |
Net identifiable intangible assets/(liabilities) |  | 4,800 |  |  |
Goodwill |  | 8,800 |  |  |
Total purchase consideration |  | 16,400 |  |  |
Net working capital (excluding inventory and deferred revenue) |  | (900) |  |  |
Neeltran Inc. [Member] | Trademarks and Trade Names [Member] |  |  |  |  |
Trade names and trademarks |  | 1,200 | $ 1,200 |  |
Neeltran Inc. [Member] | Backlog [Member] |  |  |  |  |
Finite-lived Intangibles Assets |  | 100 | 100 |  |
Neeltran Inc. [Member] | Customer Relationships [Member] |  |  |  |  |
Finite-lived Intangibles Assets |  | $ 3,500 | $ 3,500 |  |
Northeast Power Systems, Inc (NEPSI) [Member] |  |  |  |  |
Net working capital (excluding inventory and deferred revenue) |  |  |  | $ 100 |
Inventory |  |  |  | 4,200 |
Property, plant and equipment |  |  |  | 2,300 |
Deferred revenue |  |  |  | (2,700) |
Deferred tax liability |  |  |  | 1,700 | $ 1,700
Net tangible assets/(liabilities) |  |  |  | 2,200 |
Net identifiable intangible assets/(liabilities) |  |  |  | 7,300 |
Goodwill |  |  |  | 32,900 |
Total purchase consideration |  |  |  | 42,400 |
Net working capital (excluding inventory and deferred revenue) |  |  |  | 100 |
Northeast Power Systems, Inc (NEPSI) [Member] | Trademarks and Trade Names [Member] |  |  |  |  |
Trade names and trademarks |  |  |  |  | 600
Northeast Power Systems, Inc (NEPSI) [Member] | Backlog [Member] |  |  |  |  |
Finite-lived Intangibles Assets |  |  |  | 600 | 600
Northeast Power Systems, Inc (NEPSI) [Member] | Trade Names [Member] |  |  |  |  |
Trade names and trademarks |  |  |  | 600 |
Northeast Power Systems, Inc (NEPSI) [Member] | Customer Relationships [Member] |  |  |  |  |
Finite-lived Intangibles Assets |  |  |  | $ 6,100 | $ 6,100

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