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Note 2 - Securities - Changes in the Allowance for Credit Loss on Held to Maturity Securities (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2024
Dec. 31, 2023
Balance, HTM $ 107 $ 0
Provision for credit losses, HTM (3) 10
Charge-offs of securities, HTM 0 0
Recoveries, HTM 0 (37)
Balance, HTM 104 107
Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]    
Balance, HTM   134
US Treasury Securities [Member]    
Balance, HTM (0) 0
Provision for credit losses, HTM 0 0
Charge-offs of securities, HTM 0 0
Recoveries, HTM 0 0
Balance, HTM (0) (0)
US Treasury Securities [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]    
Balance, HTM   0
US Agency and Mortgage-backed Securities [Member]    
Balance, HTM (0) 0
Provision for credit losses, HTM 0 0
Charge-offs of securities, HTM 0 0
Recoveries, HTM 0 0
Balance, HTM (0) (0)
US Agency and Mortgage-backed Securities [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]    
Balance, HTM   0
US States and Political Subdivisions Debt Securities [Member]    
Balance, HTM (0) 0
Provision for credit losses, HTM 1 0
Charge-offs of securities, HTM 0 0
Recoveries, HTM 0 0
Balance, HTM 1 (0)
US States and Political Subdivisions Debt Securities [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]    
Balance, HTM   0
Corporate Debt Securities [Member]    
Balance, HTM 107 0
Provision for credit losses, HTM (4) 10
Charge-offs of securities, HTM 0 0
Recoveries, HTM 0 (37)
Balance, HTM $ 103 107
Corporate Debt Securities [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]    
Balance, HTM   $ 134