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Note 12 - Income Taxes (Details Textual) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2021 | Dec. 31, 2020
Income Tax Expense (Benefit), Total | $ 1 | $ (1,546) | $ (1,946) | $ (1,166)
Liability for Uncertainty in Income Taxes, Current | 0 |  | 0 |
Unrecognized Tax Benefits, Ending Balance | 0 |  | 0 |
Neeltran Inc. [Member] |  |  |  |
Deferred Tax Liabilities, Other Finite-Lived Assets | 2,300 |  | 2,300 |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount |  |  | (2,300) |
Northeast Power Systems, Inc (NEPSI) [Member] |  |  |  |
Deferred Tax Liabilities, Other Finite-Lived Assets | $ 1,700 |  | $ 1,700 |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount |  | $ 1,700 |  | $ 1,700

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