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Note 7 - Fair Value Measurements and Fair Value of Financial Instruments - Quantitative Information About Significant Unobservable Inputs (Details) $ in Thousands	Sep. 30, 2024 USD ($)	Dec. 31, 2023 USD ($)
Securities available-for-sale	$ 646,713	$ 617,162
Fair Value, Recurring [Member]
Securities available-for-sale	646,713	617,162
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member]
Securities available-for-sale	7,002	7,122
US States and Political Subdivisions Debt Securities [Member]
Securities available-for-sale	128,307	132,705
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Recurring [Member]
Securities available-for-sale	128,307	132,705
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member]
Securities available-for-sale	$ 7,002	$ 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	0.042	0.043

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- 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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