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Note 3 - Securities - Changes in the Allowance for Credit Loss on Held to Maturity Securities (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Balance, HTM $ 107  
Recovery of credit losses on HTM securities (12) $ 0
Charge-offs of securities, HTM 0  
Recoveries, HTM 0  
Balance, HTM 95 107
US Treasury Securities [Member]    
Balance, HTM (0)  
Recovery of credit losses on HTM securities 0  
Charge-offs of securities, HTM 0  
Recoveries, HTM 0  
Balance, HTM (0) (0)
US Agency and Mortgage-backed Securities [Member]    
Balance, HTM (0)  
Recovery of credit losses on HTM securities 0  
Charge-offs of securities, HTM 0  
Recoveries, HTM 0  
Balance, HTM (0) (0)
US States and Political Subdivisions Debt Securities [Member]    
Balance, HTM (0)  
Recovery of credit losses on HTM securities 0  
Charge-offs of securities, HTM 0  
Recoveries, HTM 0  
Balance, HTM (0) (0)
Corporate Debt Securities [Member]    
Balance, HTM 107  
Recovery of credit losses on HTM securities (12)  
Charge-offs of securities, HTM 0  
Recoveries, HTM 0  
Balance, HTM $ 95 $ 107