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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