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Note 13 - Income Taxes (Details Textual) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021
Deferred Tax Assets, Valuation Allowance | $ 186,618 | $ 200,081
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount | (13,500) |
Undistributed Earnings of Foreign Subsidiaries | 2,700 |
Deferred Tax Liability Not Recognized, Amount of Unrecognized Deferred Tax Liability, Undistributed Earnings of Foreign Subsidiaries | 300 |
Liability for Uncertainty in Income Taxes, Current | 0 |
Unrecognized Tax Benefits, Ending Balance | 0 | $ 0
Research Tax Credit Carryforward [Member] |  |
Tax Credit Carryforward, Amount | 10,900 |
Other Tax Credit Carryforwards [Member] |  |
Tax Credit Carryforward, Amount | 3,200 |
Power Quality Systems, Inc [Member] |  |
Operating Loss Carryforwards | 3,700 |
Infinia Technology Corporation (ITC) [Member] |  |
Operating Loss Carryforwards | 300 |
Domestic Tax Authority [Member] |  |
Operating Loss Carryforwards | 755,500 |
Operating Loss Carryforwards Indefinite | 86,700 |
State and Local Jurisdiction [Member] |  |
Operating Loss Carryforwards | 201,300 |
Foreign Tax Authority [Member] | State Administration of Taxation, China [Member] |  |
Operating Loss Carryforwards | $ 900 |

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