Note 2 - Basis of Presentation and Summary of Significant Accounting Policies - Schedule of New Accounting Pronouncements (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Jan. 01, 2022	Dec. 31, 2021
Allowance for credit losses on loans	$ 42,430	$ 43,092	$ 41,076	$ 38,182	$ 36,289		$ 32,912
Net deferred tax assets	18,323		16,977				4,855
Allowance for unfunded commitments	654		1,157				1,203
Retained earnings, net of tax	$ 247,159		225,883				181,329
Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
Allowance for credit losses on loans						$ 35,047
Net deferred tax assets						5,832
Allowance for unfunded commitments						2,248
Retained earnings, net of tax						179,125
Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Allowance for credit losses on loans			0			2,135	2,135
Net deferred tax assets						977
Allowance for unfunded commitments						1,045
Retained earnings, net of tax						$ (2,204)
Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
Allowance for credit losses on loans			$ 41,076				$ 35,047