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Note 2 - NEPSI Acquisitions - Purchase Price (Details) - USD ($) $ in Thousands |  | 7 Months Ended | 9 Months Ended
--- | --- | --- | ---
Oct. 01, 2020 | Oct. 26, 2019 | Dec. 31, 2020
Cash payment |  |  | $ 26,000
Northeast Power Systems, Inc (NEPSI) [Member] |  |  |
Cash payment | $ 26,000 |  |
Issuance of 873,657 shares of Company’s common stock | 12,400 |  |
Contingent consideration | 4,000 |  |
Total consideration | $ 42,400 |  |

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