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Note 14 - Financial Derivatives - Cash Flow Swap Hedges (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023
Net change in unrealized holding loss on cash flow hedge derivatives |  |  |  | $ (774,000) | $ (882,000) |
Fair Value Hedging [Member] | Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] |  |  |  |  |  |
Notional |  | $ 837,155,000 |  | $ 837,155,000 |  | $ 1,156,007,000
Weighted average fixed rate-pay |  | 3.79% |  | 3.79% |  | 2.01%
Weighted average variable rate spread |  | 0.24% |  | 0.24% |  | 0.32%
Weighted average variable rate-receive |  | 5.58% |  | 5.58% |  | 5.41%
Net change in unrealized holding loss on cash flow hedge derivatives | [1] |  |  | $ 11,654 |  | $ 7,935
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] |  |  |  |  |  |
Notional |  | $ 40,000,000 |  | 40,000,000 |  | $ 38,600,000
Periodic net settlement of swaps | [2] | $ 3,634,000 | $ 7,070,000 | $ 10,475,000 | $ 13,406,000 |
[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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