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Note 5 - Allowance for Credit Losses - Changes in Allowance for Loan Losses (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Balance, Loans $ 34,825 [1] $ 36,189 $ 36,189
Balance, Allowance for credit losses - loan commitments 341 746 746
Total allowance for credit losses beginning of year 35,166 36,935 36,935
(Recovery of) provision for credit losses - loans 350 1,011  
Recovery of credit losses - loan commitments (29) 0  
Total (recovery of) provision for credit losses - loans and loan commitments 321 1,011  
Charge-offs (1,998) (2,448) (7,851)
Recoveries 607 709  
Net recoveries (charge-offs) (1,391) (1,739)  
Balance, Allowance for credit losses - loans 33,784 35,461 34,825 [1]
Balance, Allowance for credit losses - loan commitments 312 746 341
Ending balance 34,096 36,207 35,166
Commercial Portfolio Segment [Member]      
Balance, Loans 20,418 21,850 21,850
Balance, Allowance for credit losses - loan commitments 171 597 597
Total allowance for credit losses beginning of year 20,589 22,447 22,447
(Recovery of) provision for credit losses - loans (59) (552)  
Recovery of credit losses - loan commitments (17) 0  
Total (recovery of) provision for credit losses - loans and loan commitments (76) (552)  
Charge-offs (533) (362)  
Recoveries 82 116  
Net recoveries (charge-offs) (451) (246)  
Balance, Allowance for credit losses - loans 19,908 21,052 20,418
Balance, Allowance for credit losses - loan commitments 154 597 171
Ending balance 20,062 21,649 20,589
Consumer Real Estate Portfolio Segment [Member]      
Balance, Loans 9,907 9,693 9,693
Balance, Allowance for credit losses - loan commitments 138 121 121
Total allowance for credit losses beginning of year 10,045 9,814 9,814
(Recovery of) provision for credit losses - loans (307) (135)  
Recovery of credit losses - loan commitments (6) 0  
Total (recovery of) provision for credit losses - loans and loan commitments (313) (135)  
Charge-offs (6) (66)  
Recoveries 126 209  
Net recoveries (charge-offs) 120 143  
Balance, Allowance for credit losses - loans 9,720 9,701 9,907
Balance, Allowance for credit losses - loan commitments 132 121 138
Ending balance 9,852 9,822 10,045
Consumer and Other Portfolio Segment [Member]      
Balance, Loans 4,500 4,646 4,646
Balance, Allowance for credit losses - loan commitments 32 28 28
Total allowance for credit losses beginning of year 4,532 4,674 4,674
(Recovery of) provision for credit losses - loans 716 1,698  
Recovery of credit losses - loan commitments (6) 0  
Total (recovery of) provision for credit losses - loans and loan commitments 710 1,698  
Charge-offs (1,459) (2,020) (6,693)
Recoveries 399 384  
Net recoveries (charge-offs) (1,060) (1,636)  
Balance, Allowance for credit losses - loans 4,156 4,708 4,500
Balance, Allowance for credit losses - loan commitments 26 28 32
Ending balance $ 4,182 $ 4,736 $ 4,532
[1] Derived from audited financial statements