Note 18 - Fair Values of Financial Instruments - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Fair Value	$ 405,167	$ 355,509
Equity securities	1,245	1,810
Total assets	406,412	359,918
Derivative financial instruments		2,599
Fair Value, Inputs, Level 1 [Member]
Equity securities	1,245	1,810
Total assets	1,245	1,810
Derivative financial instruments		0
Fair Value, Inputs, Level 2 [Member]
Equity securities	0	0
Total assets	398,723	335,506
Derivative financial instruments		2,599
Fair Value, Inputs, Level 3 [Member]
Equity securities	0	0
Total assets	6,444	22,602
Derivative financial instruments		0
US Government Corporations and Agencies Securities [Member]
Fair Value	29,805	21,268
US Government Corporations and Agencies Securities [Member] \| Fair Value, Inputs, Level 1 [Member]
Fair Value	0	0
US Government Corporations and Agencies Securities [Member] \| Fair Value, Inputs, Level 2 [Member]
Fair Value	29,805	21,268
US Government Corporations and Agencies Securities [Member] \| Fair Value, Inputs, Level 3 [Member]
Fair Value	0	0
US States and Political Subdivisions Debt Securities [Member]
Fair Value	18,378	32,585
US States and Political Subdivisions Debt Securities [Member] \| Fair Value, Inputs, Level 1 [Member]
Fair Value	0	0
US States and Political Subdivisions Debt Securities [Member] \| Fair Value, Inputs, Level 2 [Member]
Fair Value	12,413	10,471
US States and Political Subdivisions Debt Securities [Member] \| Fair Value, Inputs, Level 3 [Member]
Fair Value	5,965	22,114
Corporate Debt Securities [Member]
Fair Value	29,942	27,667
Corporate Debt Securities [Member] \| Fair Value, Inputs, Level 1 [Member]
Fair Value	0	0
Corporate Debt Securities [Member] \| Fair Value, Inputs, Level 2 [Member]
Fair Value	29,463	27,179
Corporate Debt Securities [Member] \| Fair Value, Inputs, Level 3 [Member]
Fair Value	479	488
Residential Mortgage-Backed Securities [Member]
Fair Value	251,851	199,904
Residential Mortgage-Backed Securities [Member] \| Fair Value, Inputs, Level 1 [Member]
Fair Value	0	0
Residential Mortgage-Backed Securities [Member] \| Fair Value, Inputs, Level 2 [Member]
Fair Value	251,851	199,904
Residential Mortgage-Backed Securities [Member] \| Fair Value, Inputs, Level 3 [Member]
Fair Value	0	0
Commercial Mortgage-Backed Securities [Member]
Fair Value	75,191	74,085
Commercial Mortgage-Backed Securities [Member] \| Fair Value, Inputs, Level 1 [Member]
Fair Value	0	0
Commercial Mortgage-Backed Securities [Member] \| Fair Value, Inputs, Level 2 [Member]
Fair Value	75,191	74,085
Commercial Mortgage-Backed Securities [Member] \| Fair Value, Inputs, Level 3 [Member]
Fair Value	$ 0	$ 0

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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