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Note 4 - Derivative Instruments and Hedging Activities (Details Textual) $ in Thousands |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2023 USD ($) | Mar. 31, 2020 | Sep. 30, 2023 USD ($) | Sep. 30, 2022 USD ($) | Sep. 30, 2023 USD ($) | Sep. 30, 2022 USD ($) | Dec. 31, 2017 | Dec. 31, 2022 USD ($)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax |  |  | $ 1,045 | $ 13,757 | $ 2,309 | $ 39,614 |  |
Derivative Assets (Liabilities), Net Fair Value of Derivative Contracts, Excluding Impact of Credit Risk | $ 54,388 |  | 54,388 |  | $ 54,388 |  |  | $ 51,184
Commodity Contract [Member] |  |  |  |  |  |  |  |
Derivative, Number of Instruments Held, Total |  |  |  | 0 |  | 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 | $ 2,309 |  | $ 1,045 | $ 13,757 |  | $ 39,614 |  |

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