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Note 5 - Goodwill and Other Intangibles - Goodwill (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Mar. 31, 2023 | Mar. 31, 2022
March 31, 2021 | $ 43,471 |
Less impairment loss | 0 | $ 0
March 31, 2022 | 43,471 | 43,471
Grid [Member] |  |
March 31, 2021 | 43,471 | 34,634
Neeltran Acquisition |  | 8,837
Less impairment loss | 0 |
March 31, 2022 | $ 43,471 | $ 43,471

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