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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) |  |  |

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