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Note 6 - Allowance for Credit Losses - Changes in Allowance for Loan Losses (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Balance, Loans $ 36,189 [1] $ 30,556 $ 30,556
Balance, Allowance for credit losses - loan commitments 746 1,196 1,196
Total allowance for credit losses beginning of year 36,935 31,752 31,752
Provision (recovery) for credit losses - loans 1,011 1,974  
Provision for credit losses - loan commitments 0 (232)  
Total (recovery) provision for credit losses - loans and loan commitments 1,011 1,742  
Charge-offs (2,448) (2,570) (8,825)
Recoveries 709 829  
Net (charge-offs) recoveries (1,739) (1,741)  
Balance, Allowance for credit losses - loans 35,461 30,789 36,189 [1]
Balance, Allowance for credit losses - loan commitments 746 964 746
Ending balance 36,207 31,753 36,935
(Recovery) provision for credit losses - loan commitments 0 (232)  
Commercial Portfolio Segment [Member]      
Balance, Loans 21,850 17,213 17,213
Balance, Allowance for credit losses - loan commitments 597 1,018 1,018
Total allowance for credit losses beginning of year 22,447 18,231 18,231
Provision (recovery) for credit losses - loans (552) 37  
Provision for credit losses - loan commitments 0 (232)  
Total (recovery) provision for credit losses - loans and loan commitments (552) (195)  
Charge-offs (362) (173)  
Recoveries 116 192  
Net (charge-offs) recoveries (246) 19  
Balance, Allowance for credit losses - loans 21,052 17,269 21,850
Balance, Allowance for credit losses - loan commitments 597 786 597
Ending balance 21,649 18,055 22,447
(Recovery) provision for credit losses - loan commitments 0 (232)  
Consumer Real Estate Portfolio Segment [Member]      
Balance, Loans 9,693 8,931 8,931
Balance, Allowance for credit losses - loan commitments 121 156 156
Total allowance for credit losses beginning of year 9,814 9,087 9,087
Provision (recovery) for credit losses - loans (135) 103  
Provision for credit losses - loan commitments 0 (6)  
Total (recovery) provision for credit losses - loans and loan commitments (135) 97  
Charge-offs (66) (98)  
Recoveries 209 59  
Net (charge-offs) recoveries 143 (39)  
Balance, Allowance for credit losses - loans 9,701 8,995 9,693
Balance, Allowance for credit losses - loan commitments 121 150 121
Ending balance 9,822 9,145 9,814
(Recovery) provision for credit losses - loan commitments 0 (6)  
Consumer and Other Portfolio Segment [Member]      
Balance, Loans 4,646 4,412 4,412
Balance, Allowance for credit losses - loan commitments 28 22 22
Total allowance for credit losses beginning of year 4,674 4,434 4,434
Provision (recovery) for credit losses - loans 1,698 1,834  
Provision for credit losses - loan commitments 0 6  
Total (recovery) provision for credit losses - loans and loan commitments 1,698 1,840  
Charge-offs (2,020) (2,299)  
Recoveries 384 578  
Net (charge-offs) recoveries (1,636) (1,721)  
Balance, Allowance for credit losses - loans 4,708 4,525 4,646
Balance, Allowance for credit losses - loan commitments 28 28 28
Ending balance 4,736 4,553 $ 4,674
(Recovery) provision for credit losses - loan commitments $ 0 $ 6  
[1] Derived from audited financial statements