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Note 2 - Securities - Changes in the Allowance for Credit Loss on Held to Maturity Securities (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
USD ($)
Balance, HTM $ 0
Provision for credit losses, HTM 10
Charge-offs of securities, HTM 0
Recoveries, HTM (37)
Balance, HTM 107
Accounting Standards Update 2016-13 [Member]  
Balance, HTM 0
Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]  
Balance, HTM 134
US Treasury Securities [Member]  
Balance, HTM 0
Provision for credit losses, HTM 0
Charge-offs of securities, HTM 0
Recoveries, HTM 0
Balance, HTM (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
Provision for credit losses, HTM 0
Charge-offs of securities, HTM 0
Recoveries, HTM 0
Balance, HTM (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
Provision for credit losses, HTM 0
Charge-offs of securities, HTM 0
Recoveries, HTM 0
Balance, HTM (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 0
Provision for credit losses, HTM 10
Charge-offs of securities, HTM 0
Recoveries, HTM (37)
Balance, HTM 107
Corporate Debt Securities [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]  
Balance, HTM $ 134