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Note 3 - Investment Securities - Amortized Cost and Fair Value of Debt Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024	Jul. 31, 2024
Securities available for sale, amortized cost, due in one year or less	$ 69,148
Securities available for sale, fair value, due in one year or less	67,850
Securities held to maturity, amortized cost, due in one year or less	0
Securities held to maturity, fair value, due in one year or less	0
Securities available for sale, amortized cost, due in one year through five years	77,427
Securities available for sale, fair value, due in one year through five years	73,803
Securities held to maturity, amortized cost, due in one year through five years	0
Securities held to maturity, fair value, due in one year through five years	0
Securities available for sale, amortized cost, due after five years through ten years	61,762
Securities available for sale, fair value, due after five years through ten years	55,648
Securities held to maturity, amortized cost, due after five years through ten years	2,000
Securities held to maturity, fair value, due after five years through ten years	1,324
Securities available for sale, amortized cost, due after ten years	66,645
Securities available for sale, fair value, due after ten years	58,700
Securities held to maturity, amortized cost, due after ten years	5,000
Securities held to maturity, fair value, due after ten years	3,267
Securities available for sale, amortized cost, allocated and single maturity date	274,982
Securities available for sale, fair value, allocated and single maturity date	256,001
Securities held to maturity, amortized cost, allocated and single maturity date	7,000
Securities held to maturity, fair value, allocated and single maturity date	4,591
Securities available for sale, amortized cost, without single maturity date	142,269
Securities available for sale, fair value, without single maturity date	135,717
Securities held to maturity, amortized cost, without single maturity date	0
Securities held to maturity, fair value, without single maturity date	0
Securities available for sale, amortized cost	417,251	$ 418,935
Securities available for sale, fair value	391,718	389,243
Securities held to maturity, amortized cost	7,000	7,000	$ 2,000
Securities held to maturity, fair value	$ 4,591	$ 4,591

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