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Note 4 - Derivative Instruments and Hedging Activities (Details Textual)
$ in Thousands
 1 Months Ended 3 Months Ended 12 Months Ended
Mar. 31, 2020
Mar. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Mar. 31, 2023
USD ($)
Dec. 31, 2017
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax   $ 1,982   $ (4,488)  
Gain (Loss) on Investments   (6,019)   0  
Derivative Assets (Liabilities), Net Fair Value of Derivative Contracts, Excluding Impact of Credit Risk   $ 52,576 $ 55,042    
Wallbox N.V. [Member]          
Payments to Acquire Investments     $ 30,000    
Investment Owned, Net Assets, Percentage     5.00%    
Gain (Loss) on Investments     $ (6,019)    
Wallbox N.V. [Member] | Option to Purchase Additional Interest [Member]          
Investment Owned, Net Assets, Percentage     5.00%    
Commodity Contract [Member]          
Derivative, Number of Instruments Held, Total   0      
Interest Rate Swap [Member]          
Number of New Contracts Entered 3       20
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax   $ 1,982   $ (4,488)  
Stock Warrants [Member] | Wallbox N.V. [Member]          
Unrealized Gain (Loss) on Derivatives   $ (4,849)