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Note 14 - Financial Derivatives - Cash Flow Swap Hedges (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023
Net change in unrealized holding loss on cash flow hedge derivatives |  | $ (441,000) | $ (441,000) |
Fair Value Hedging [Member] | Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] |  |  |  |
Notional |  | $ 775,466,000 |  | $ 1,156,007,000
Weighted average fixed rate-pay |  | 2.87% |  | 2.01%
Weighted average variable rate spread |  | 0.22% |  | 0.32%
Weighted average variable rate-receive |  | 5.56% |  | 5.41%
Net change in unrealized holding loss on cash flow hedge derivatives | [1] | $ 11,502 |  | $ 7,935
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] |  |  |  |
Notional |  | 42,000,000 |  | 38,600,000
Periodic net settlement of swaps | [2] | $ 6,841,000 |  | $ 6,336,000
[1] | the amount is included in other non-interest income.
[2] | the amount of periodic net settlement of interest rate swaps was included in interest income.

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