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Note 1 - Significant Accounting Policies - Impact of ASC 326 (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Jun. 30, 2023
Jan. 01, 2023
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Dec. 31, 2021
Financing Receivable, Allowance for Credit Loss $ 16,118 $ 16,319   $ 15,697 $ 15,897 $ 16,420 $ 16,621
Accounting Standards Update 2016-13 [Member]              
Financing Receivable, Allowance for Credit Loss     $ 15,697        
Allowance for credit losses on off-balance sheet credit exposures     798        
Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]              
Financing Receivable, Allowance for Credit Loss     16,215        
Allowance for credit losses on off-balance sheet credit exposures     1,071        
Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]              
Financing Receivable, Allowance for Credit Loss     518 $ 518      
Allowance for credit losses on off-balance sheet credit exposures     $ 273