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Note 2 - Securities - Changes in the Allowance for Credit Loss on Held to Maturity Securities (Details) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Balance, HTM $ 94 $ 106 $ 106
Provision for credit losses, HTM 3 3 (12)
Charge-offs of securities, HTM 0 0 0
Recoveries, HTM 0 0 0
Balance, HTM 97 109 94
US Treasury Securities [Member]      
Balance, HTM (0) 0 0
Provision for credit losses, HTM 0 0 0
Charge-offs of securities, HTM 0 0 0
Recoveries, HTM 0 0 0
Balance, HTM (0) 0 (0)
US Agency and Mortgage-backed Securities [Member]      
Balance, HTM (0) 0 0
Provision for credit losses, HTM 0 0 0
Charge-offs of securities, HTM 0 0 0
Recoveries, HTM 0 0 0
Balance, HTM (0) 0 (0)
US States and Political Subdivisions Debt Securities [Member]      
Balance, HTM (0) 0 0
Provision for credit losses, HTM 0 1 0
Charge-offs of securities, HTM 0 0 0
Recoveries, HTM 0 0 0
Balance, HTM (0) 1 (0)
Corporate Debt Securities [Member]      
Balance, HTM 94 106 106
Provision for credit losses, HTM 3 2 (12)
Charge-offs of securities, HTM 0 0 0
Recoveries, HTM 0 0 0
Balance, HTM $ 97 $ 108 $ 94