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Note 14 - Income Taxes (Details Textual) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Capitalized Research and Development Expenses $ 31,900  
Capitalized Research and Development Expenses, Remaining Basis 24,400  
Deferred Tax Assets, Valuation Allowance 171,674 $ 177,112
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount (5,400)  
Undistributed Earnings of Foreign Subsidiaries 3,100  
Deferred Tax Liability Not Recognized, Amount of Unrecognized Deferred Tax Liability, Undistributed Earnings of Foreign Subsidiaries 400  
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 2,500  
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 655,700  
Operating Loss Carryforwards Indefinite 103,100  
State and Local Jurisdiction [Member]    
Operating Loss Carryforwards 185,600  
Foreign Tax Jurisdiction [Member] | National Agency for Fiscal Administration of Romania [Member]    
Operating Loss Carryforwards $ 400  
Open Tax Year 2020 2021 2022 2023 2024 2025  
Foreign Tax Jurisdiction [Member] | National Revenue Administration of Poland [Member]    
Operating Loss Carryforwards $ 400  
Open Tax Year 2021 2022 2023 2024 2025  
Foreign Tax Jurisdiction [Member] | Austrian Federal Ministry of Finance [Member]    
Open Tax Year 2023 2024 2025