Note 24 - Fair Value of Financial Instruments - Quantitative Information for Assets Measured on a Recurring Basis (Details) $ in Thousands	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Securities, fair value	$ 879,571	$ 890,751
US States and Political Subdivisions Debt Securities [Member]
Securities, fair value	303,773	$ 315,535
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Securities, fair value	$ 20,847
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Liquidity Premium [Member]
Securities, range of discounts	0.01
Corporate Bond Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Securities, fair value	$ 7,968
Corporate Bond Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Liquidity Premium [Member]
Securities, range of discounts	0.02