Note 4 - Securities - Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Amortized cost, due in one year or less, available for sale securities	$ 30,957
Fair value, due in one year or less, available for sale securities	30,674
Amortized cost, due after one year through five years, available for sale securities	202,285
Fair value, due after one year through five years, available for sale securities	191,613
Amortized cost, due after five years through ten years, available for sale securities	249,367
Fair value, due after five years through ten years, available for sale securities	217,742
Amortized cost, due after ten years, available for sale securities	202,863
Fair value, due after ten years, available for sale securities	182,242
Amortized cost, total securities available for sale	685,472	$ 697,786
Fair value, total securities available for sale	$ 622,271	$ 618,601

Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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