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Note 1 - Summary of Significant Accounting Policies - Impact of ASC 326 (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Jan. 01, 2023
Dec. 31, 2022
Allowance for credit loss $ 17,058 $ 16,776   $ 15,697
Accounting Standards Update 2016-13 [Member]        
Allowance for credit loss     $ 15,697  
Allowance for credit losses on off-balance sheet credit exposures     798  
Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Accounting Standards Update 2016-13 [Member]        
Allowance for credit loss     16,215  
Allowance for credit losses on off-balance sheet credit exposures     1,071  
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]        
Allowance for credit loss   $ 0 518 $ 518
Allowance for credit losses on off-balance sheet credit exposures     $ 273