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Note 6 - Fair Value Measurements - Assets Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Equity securities, at fair value (Note 2)	$ 8,282	$ 8,492
Securities available for sale, at fair value (Note 2)	641,048	1,098,885
US Treasury and Government [Member]
Securities available for sale, at fair value (Note 2)	0	2,008
US Treasury Securities [Member]
Securities available for sale, at fair value (Note 2)	86,491	91,979
US States and Political Subdivisions Debt Securities [Member]
Securities available for sale, at fair value (Note 2)	312,388	534,847
Collateralized Mortgage-Backed Securities [Member]
Securities available for sale, at fair value (Note 2)	226,669	433,115
Corporate Debt Securities [Member]
Securities available for sale, at fair value (Note 2)	1,255	20,642
Asset-Backed Securities [Member]
Securities available for sale, at fair value (Note 2)	14,245	16,294
Fair Value, Recurring [Member]
Securities available for sale, at fair value (Note 2)	641,048	1,098,885
Fair Value, Recurring [Member] | Equity Securities [Member]
Equity securities, at fair value (Note 2)	8,282	8,492
Fair Value, Recurring [Member] | US Treasury and Government [Member]
Securities available for sale, at fair value (Note 2)	0	2,008
Fair Value, Recurring [Member] | US Treasury Securities [Member]
Securities available for sale, at fair value (Note 2)	86,491	91,979
Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member]
Securities available for sale, at fair value (Note 2)	312,388	534,847
Fair Value, Recurring [Member] | Collateralized Mortgage-Backed Securities [Member]
Securities available for sale, at fair value (Note 2)	226,669	433,115
Fair Value, Recurring [Member] | Corporate Debt Securities [Member]
Securities available for sale, at fair value (Note 2)	1,255	20,642
Fair Value, Recurring [Member] | Asset-Backed Securities [Member]
Securities available for sale, at fair value (Note 2)	14,245	16,294
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member]
Securities available for sale, at fair value (Note 2)	0	0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Equity Securities [Member]
Equity securities, at fair value (Note 2)	6,515	6,724
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | US Treasury and Government [Member]
Securities available for sale, at fair value (Note 2)	0	0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | US Treasury Securities [Member]
Securities available for sale, at fair value (Note 2)	0	0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member]
Securities available for sale, at fair value (Note 2)	0	0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Collateralized Mortgage-Backed Securities [Member]
Securities available for sale, at fair value (Note 2)	0	0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Corporate Debt Securities [Member]
Securities available for sale, at fair value (Note 2)	0	0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Asset-Backed Securities [Member]
Securities available for sale, at fair value (Note 2)	0	0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member]
Securities available for sale, at fair value (Note 2)	641,048	1,077,835
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Equity Securities [Member]
Equity securities, at fair value (Note 2)	0	0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | US Treasury and Government [Member]
Securities available for sale, at fair value (Note 2)	0	2,008
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | US Treasury Securities [Member]
Securities available for sale, at fair value (Note 2)	86,491	91,979
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member]
Securities available for sale, at fair value (Note 2)	312,388	514,797
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Collateralized Mortgage-Backed Securities [Member]
Securities available for sale, at fair value (Note 2)	226,669	433,115
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Corporate Debt Securities [Member]
Securities available for sale, at fair value (Note 2)	1,255	19,642
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Asset-Backed Securities [Member]
Securities available for sale, at fair value (Note 2)	14,245	16,294
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member]
Securities available for sale, at fair value (Note 2)	0	21,050
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Equity Securities [Member]
Equity securities, at fair value (Note 2)	1,767	1,768
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | US Treasury and Government [Member]
Securities available for sale, at fair value (Note 2)	0	0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | US Treasury Securities [Member]
Securities available for sale, at fair value (Note 2)	0	0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member]
Securities available for sale, at fair value (Note 2)	0	20,050
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Collateralized Mortgage-Backed Securities [Member]
Securities available for sale, at fair value (Note 2)	0	0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Corporate Debt Securities [Member]
Securities available for sale, at fair value (Note 2)	0	1,000
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Asset-Backed Securities [Member]
Securities available for sale, at fair value (Note 2)	$ 0	$ 0

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