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Note 2 - NEPSI Acquisitions - Estimated Fair Values of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Oct. 01, 2020 | Mar. 31, 2020
--- | --- | --- | ---
Goodwill | $ 34,659 |  | $ 1,719
Northeast Power Systems, Inc (NEPSI) [Member] |  |  |
Net working capital (excluding inventory and deferred revenue) |  | $ 100 |
Inventory | $ 1,000 | 4,200 |
Property, plant and equipment |  | 2,300 |
Deferred revenue |  | (2,700) |
Deferred tax liability |  | 1,700 |
Net tangible assets/(liabilities) |  | 2,200 |
Net identifiable intangible assets/(liabilities) |  | 7,300 |
Trade names and trademarks |  | 7,300 |
Goodwill |  | 32,900 |
Total purchase consideration |  | 42,400 |
Northeast Power Systems, Inc (NEPSI) [Member] | Backlog [Member] |  |  |
Net identifiable intangible assets/(liabilities) |  | 600 |
Trade names and trademarks |  | 600 |
Northeast Power Systems, Inc (NEPSI) [Member] | Trade Names [Member] |  |  |
Net identifiable intangible assets/(liabilities) |  | 600 |
Trade names and trademarks |  | 600 |
Northeast Power Systems, Inc (NEPSI) [Member] | Customer Relationships [Member] |  |  |
Net identifiable intangible assets/(liabilities) |  | 6,100 |
Trade names and trademarks |  | $ 6,100 |

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