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Note 2 - Securities - Changes in the Allowance for Credit Loss on Held to Maturity Securities (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
USD ($)
Balance, HTM $ 107
Provision for credit losses, HTM 9
Charge-offs of securities, HTM 0
Recoveries, HTM 0
Balance, HTM 116
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 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 States and Political Subdivisions Debt Securities [Member]  
Balance, HTM (0)
Provision for credit losses, HTM 1
Charge-offs of securities, HTM 0
Recoveries, HTM 0
Balance, HTM 1
Corporate Debt Securities [Member]  
Balance, HTM 107
Provision for credit losses, HTM 8
Charge-offs of securities, HTM 0
Recoveries, HTM 0
Balance, HTM $ 115