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Note 5 - Allowance for Credit Losses - Changes in Allowance for Loan Losses (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Balance, Loans $ 33,020 $ 34,885 $ 34,825 [1] $ 36,189 $ 36,189
Balance, Allowance for credit losses - loan commitments 319 441 341 746 746
Total allowance for credit losses beginning of year 33,339 35,326 35,166 36,935 36,935
(Recovery of) provision for credit losses - loans 0 1,360 58 2,820  
Provision for (recovery of) credit losses - loan commitments 0 0 (22) (305)  
Total (recovery of) provision for credit losses - loans and loan commitments 0 1,360 36 2,515  
Charge-offs (2,015) (1,800) (5,522) (5,847) (7,851)
Recoveries 592 673 2,236 1,956  
Net charge-offs (1,423) (1,127) (3,286) (3,891)  
Balance, Allowance for credit losses - loans 31,597 35,118 31,597 35,118 34,825 [1]
Balance, Allowance for credit losses - loan commitments 319 441 319 441 341
Ending balance 31,916 35,559 31,916 35,559 35,166
Commercial Portfolio Segment [Member]          
Balance, Loans 19,247 20,352 20,418 21,850 21,850
Balance, Allowance for credit losses - loan commitments 163 289 171 597 597
Total allowance for credit losses beginning of year 19,410 20,641 20,589 22,447 22,447
(Recovery of) provision for credit losses - loans (2,311) (151) (3,473) (1,337)  
Provision for (recovery of) credit losses - loan commitments 0 0 (8) (308)  
Total (recovery of) provision for credit losses - loans and loan commitments (2,311) (151) (3,481) (1,645)  
Charge-offs (536) (89) (1,231) (645)  
Recoveries 187 253 873 497  
Net charge-offs (349) 164 (358) (148)  
Balance, Allowance for credit losses - loans 16,587 20,365 16,587 20,365 20,418
Balance, Allowance for credit losses - loan commitments 163 289 163 289 171
Ending balance 16,750 20,654 16,750 20,654 20,589
Consumer Real Estate Portfolio Segment [Member]          
Balance, Loans 9,807 9,879 9,907 9,693 9,693
Balance, Allowance for credit losses - loan commitments 130 118 138 121 121
Total allowance for credit losses beginning of year 9,937 9,997 10,045 9,814 9,814
(Recovery of) provision for credit losses - loans 1,240 242 992 300  
Provision for (recovery of) credit losses - loan commitments 0 0 (8) (3)  
Total (recovery of) provision for credit losses - loans and loan commitments 1,240 242 984 297  
Charge-offs (75) (22) (104) (151)  
Recoveries 69 57 246 314  
Net charge-offs (6) 35 142 163  
Balance, Allowance for credit losses - loans 11,041 10,156 11,041 10,156 9,907
Balance, Allowance for credit losses - loan commitments 130 118 130 118 138
Ending balance 11,171 10,274 11,171 10,274 10,045
Consumer and Other Portfolio Segment [Member]          
Balance, Loans 3,966 4,654 4,500 4,646 4,646
Balance, Allowance for credit losses - loan commitments 26 34 32 28 28
Total allowance for credit losses beginning of year 3,992 4,688 4,532 4,674 4,674
(Recovery of) provision for credit losses - loans 1,071 1,269 2,539 3,857  
Provision for (recovery of) credit losses - loan commitments 0 0 (6) 6  
Total (recovery of) provision for credit losses - loans and loan commitments 1,071 1,269 2,533 3,863  
Charge-offs (1,404) (1,689) (4,187) (5,051) (6,693)
Recoveries 336 363 1,117 1,145  
Net charge-offs (1,068) (1,326) (3,070) (3,906)  
Balance, Allowance for credit losses - loans 3,969 4,597 3,969 4,597 4,500
Balance, Allowance for credit losses - loan commitments 26 34 26 34 32
Ending balance $ 3,995 $ 4,631 $ 3,995 $ 4,631 $ 4,532
[1] Derived from audited financial statements