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Note 6 - Fair Value Measurements and Fair Value of Financial Instruments - Quantitative Information About Significant Unobservable Inputs (Details) $ in Thousands | Jun. 30, 2024 USD ($) | Dec. 31, 2023 USD ($)
--- | --- | ---
Securities available-for-sale | $ 620,579 | $ 617,162
Fair Value, Recurring [Member] |  |
Securities available-for-sale | 620,579 | 617,162
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] |  |
Securities available-for-sale | 6,751 | 7,122
US States and Political Subdivisions Debt Securities [Member] |  |
Securities available-for-sale | 125,670 | 132,705
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Recurring [Member] |  |
Securities available-for-sale | 125,670 | 132,705
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] |  |
Securities available-for-sale | $ 6,751 | $ 7,122
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Discount Rate [Member] |  |
Securities available-for-sale, rate | 0.048 | 0.043

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