Note 9 - Long-term Debt - Schedule of Long-term Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022	Mar. 31, 2021	Nov. 30, 2018
Principal	$ 175,000	$ 175,000
Unamortized debt issuance costs	981	1,415
Six Point One Eight Percent Fixed To Floating Rate Subordinated Debentures Due December First Two Thousands Twenty Eight [Member]
Principal	55,000	55,000		$ 55,000
Unamortized debt issuance costs	33	180
Four Percent Fixed To Floating Rate Subordinated Debentures Due April First Two Thousand Thirty One [Member]
Principal	120,000	120,000	$ 120,000
Unamortized debt issuance costs	$ 948	$ 1,235