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Note 7 - Fair Value Measurements and Fair Value of Financial Instruments - Quantitative Information About Significant Unobservable Inputs (Details) $ in Thousands	Mar. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)
Securities available-for-sale	$ 636,806	$ 612,847
Fair Value, Recurring [Member]
Securities available-for-sale	636,806	612,847
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member]
Securities available-for-sale	6,637	6,526
US States and Political Subdivisions Debt Securities [Member]
Securities available-for-sale	118,657	122,404
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Recurring [Member]
Securities available-for-sale	118,657	122,404
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member]
Securities available-for-sale	$ 6,637	$ 6,526
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	0.047	0.05

X

- Definition

Amount 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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