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Note 15 - Financial Derivatives - Cash Flow Swap Hedges (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | Dec. 31, 2022
Net change in unrealized holding (loss)/gain on cash flow hedge derivatives |  |  |  | $ (882,000) | $ 4,158,000 |
Interest Rate Swap [Member] |  |  |  |  |  |
Notional |  | $ 6,100,000 |  | 6,100,000 |  |
Interest Rate Swap [Member] | Fair Value Hedging [Member] | Designated as Hedging Instrument [Member] |  |  |  |  |  |
Notional |  | $ 758,655,000 |  | $ 758,655,000 |  | $ 874,034,000
Weighted average fixed rate-pay |  | 1.82% |  | 1.82% |  | 2.12%
Weighted average variable rate spread |  | 0.38% |  | 0.38% |  | 0.68%
Weighted average variable rate-receive |  | 5.19% |  | 5.19% |  | 2.61%
Net change in unrealized holding (loss)/gain on cash flow hedge derivatives |  |  |  | $ 31,954 |  | $ 38,589
Interest Rate Swap [Member] | Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] |  |  |  |  |  |
Notional |  |  |  |  |  | $ 50,000,000.0
Periodic net settlement of swaps | [1] | $ 7,070,000 | $ 484,000 | $ 13,406,000 | $ 1,172,000 |
[1] | the amount of periodic net settlement of interest rate swaps was included in interest expense.

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