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Note 13 - Income Taxes (Details Textual) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023
Capitalized Research and Development Expenses | $ 18,400 |
Deferred Tax Assets, Valuation Allowance | 177,112 | $ 183,567
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount | 6,500 |
Undistributed Earnings of Foreign Subsidiaries | 2,200 |
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 | 0 | $ 0
Research Tax Credit Carryforward [Member] |  |
Tax Credit Carryforward, Amount | 10,600 |
Other Tax Credit Carryforwards [Member] |  |
Tax Credit Carryforward, Amount | 2,800 |
Power Quality Systems, Inc [Member] |  |
Operating Loss Carryforwards | 3,500 |
Infinia Technology Corporation (ITC) [Member] |  |
Operating Loss Carryforwards | 300 |
Domestic Tax Jurisdiction [Member] |  |
Operating Loss Carryforwards | 682,700 |
Operating Loss Carryforwards Indefinite | 103,100 |
State and Local Jurisdiction [Member] |  |
Operating Loss Carryforwards | 197,200 |
Foreign Tax Jurisdiction [Member] |  |
Operating Loss Carryforwards | $ 600 |

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