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Note 13 - Income Taxes (Details Textual) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Deferred Tax Assets, Valuation Allowance, Total $ 200,081 $ 199,989
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount 100  
Undistributed Earnings of Foreign Subsidiaries 1,700  
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 10,600  
Other Tax Credit Carryforwards [Member]    
Tax Credit Carryforward, Amount 3,000  
Power Quality Systems, Inc [Member]    
Operating Loss Carryforwards, Total 3,700  
Infinia Technology Corporation (ITC) [Member]    
Operating Loss Carryforwards, Total 300  
Domestic Tax Authority [Member]    
Operating Loss Carryforwards, Total 780,500  
Operating Loss Carryforwards Indefinite 68,200  
State and Local Jurisdiction [Member]    
Operating Loss Carryforwards, Total 211,100  
Foreign Tax Authority [Member] | State Administration of Taxation, China [Member]    
Operating Loss Carryforwards, Total 30,100  
Foreign Tax Authority [Member] | Romanian National Agency for Fiscal Administration [Member]    
Operating Loss Carryforwards, Total $ 900