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Note 15 - Financial Derivatives - Cash Flow Swap Hedges (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022
Net change in unrealized holding (loss)/gain on cash flow hedge derivatives |  |  |  | $ (1,323,000) | $ 5,803,000 |
Fair Value Hedging [Member] | Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] |  |  |  |  |  |
Notional |  | $ 857,341,000 | $ 874,034,000 | $ 857,341,000 | $ 874,034,000 |
Weighted average fixed rate-pay |  | 1.80% | 2.12% | 1.80% | 2.12% |
Weighted average variable rate spread |  | 0.27% | 0.68% | 0.27% | 0.68% |
Weighted average variable rate-receive |  | 5.33% | 2.61% | 5.33% | 2.61% |
Net change in unrealized holding (loss)/gain on cash flow hedge derivatives |  |  |  | $ 27,378 | $ 38,589 |
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] |  |  |  |  |  |
Notional |  | $ 56,000,000 |  | 56,000,000 |  | $ 50,000,000
Periodic net settlement of swaps | [1] | $ 7,659,000 | $ 1,461,000 | $ 21,065,000 | $ (1,628,000) |
[1] | the amount of periodic net settlement of interest rate swaps was included in interest expense.

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