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Note 4 - Derivative Instruments and Hedging Activities (Details Textual) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2021 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2017 | Dec. 31, 2020 USD ($)
Derivative, Number of Instruments Held, Total | 0 |  |  |
Derivative Assets (Liabilities), Net Fair Value of Derivative Contracts, Excluding Impact of Credit Risk | $ (9,017) |  |  | $ (28,667)
Interest Rate Swap [Member] |  |  |  |
Number of New Contracts Entered |  | 3 | 20 |
Derivative, Number of Instruments Outstanding | 15 |  |  |
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax | $ 14,995 | $ (15,813) |  |

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