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Note 3 - Acquisitions - Purchase Price (Details) - USD ($) $ in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
May 06, 2021 | Oct. 01, 2020 | Mar. 31, 2022 | Mar. 31, 2021
Cash or Debt payment |  |  | $ 11,479 | $ 26,000
Neeltran Inc. [Member] |  |  |  |
Cash or Debt payment | $ 4,400 |  |  |
Total consideration | 16,400 |  |  |
Neeltran Inc. [Member] | Neeltran Inc. Sellling Stockholders [Member] |  |  |  |
Cash or Debt payment | 1,000 |  |  |
Issuance of 301,556 shares of Company's common stock | 4,400 |  |  |
Neeltran Inc. [Member] | Neeltran Third Party Lenders [Member] |  |  |  |
Cash or Debt payment | $ 7,600 |  |  |
Northeast Power Systems, Inc (NEPSI) [Member] |  |  |  |
Cash or Debt payment |  | $ 26,000 |  |
Issuance of 301,556 shares of Company's common stock |  | 12,400 |  |
Total consideration |  | 42,400 |  |
Contingent consideration |  | $ 4,000 |  |

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