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Note 4 - Derivative Instruments and Hedging Activities (Details Textual) $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Mar. 31, 2020 | Jun. 30, 2022 USD ($) | Mar. 31, 2022 | Jun. 30, 2021 USD ($) | Jun. 30, 2022 USD ($) | Jun. 30, 2021 USD ($) | Dec. 31, 2017 | Dec. 31, 2021 USD ($)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax, Total |  | $ 7,129 |  | $ (2,752) | $ 25,857 | $ 12,243 |  |
Derivative Assets (Liabilities), Net Fair Value of Derivative Contracts, Excluding Impact of Credit Risk |  |  |  | 33,682 |  | 33,682 |  | $ (2,148)
Commodity Contract [Member] |  |  |  |  |  |  |  |
Derivative, Number of Instruments Held, Total |  |  |  |  |  |  |  | 0
Interest Rate Swap [Member] |  |  |  |  |  |  |  |
Number of New Contracts Entered | 3 |  | 11 |  |  |  | 20 |
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax, Total |  | $ 7,129 |  | $ 2,752 | $ 25,857 | $ 12,243 |  |

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