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Note 9 - Long-term Debt (Details Textual) - USD ($)
$ in Thousands
 1 Months Ended
Dec. 01, 2023
Mar. 31, 2021
Nov. 30, 2018
Dec. 31, 2023
Dec. 31, 2022
Debt Instrument, Face Amount       $ 120,000 $ 175,000
Six Point One Eight Percent Fixed To Floating Rate Subordinated Debentures Due December First Two Thousands Twenty Eight [Member]          
Debt Instrument, Face Amount     $ 55,000 0 55,000
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate     6.18%    
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed 100.00%        
Six Point One Eight Percent Fixed To Floating Rate Subordinated Debentures Due December First Two Thousands Twenty Eight [Member] | London Interbank Offered Rate [Member]          
Debt Instrument, Basis Spread on Variable Rate     3.15%    
Four Percent Fixed To Floating Rate Subordinated Debentures Due April First Two Thousand Thirty One [Member]          
Debt Instrument, Face Amount   $ 120,000   $ 120,000 $ 120,000
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate   4.00%      
Four Percent Fixed To Floating Rate Subordinated Debentures Due April First Two Thousand Thirty One [Member] | Secured Overnight Financing Rate (SOFR) [Member]          
Debt Instrument, Basis Spread on Variable Rate   3.29%