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Note 5 - Allowance for Loan Losses, Nonperforming Assets and Impaired Loans - Impaired Loans and Associated Reserves (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Principal balance [1] $ 3,719 $ 6,478
Total recorded investment [1],[2] 3,032 5,878
Recorded investment for which there is no related allowance [1] 3,032 5,878
Recorded investment for which there is a related allowance [1] 0 0
Related allowance [1] (0) (0)
Consumer Real Estate Portfolio Segment [Member] | Investor Owned Residential Real Estate [Member]    
Principal balance [1] 186 191
Total recorded investment [1],[2] 186 191
Recorded investment for which there is no related allowance [1] 186 191
Recorded investment for which there is a related allowance [1] 0 0
Related allowance [1] 0 0
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate, Owner Occupied [Member]    
Principal balance [1] 3,248 3,256
Total recorded investment [1],[2] 2,583 2,665
Recorded investment for which there is no related allowance [1] 2,583 2,665
Recorded investment for which there is a related allowance [1] 0 0
Related allowance [1] 0 0
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Other [Member]    
Principal balance [1]   2,721
Total recorded investment [1],[2]   2,721
Recorded investment for which there is no related allowance [1]   2,721
Recorded investment for which there is a related allowance [1]   0
Related allowance [1]   0
Commercial Non Real Estate Segment [Member] | Commercial and Industrial [Member]    
Principal balance [1] 285 310
Total recorded investment [1],[2] 263 301
Recorded investment for which there is no related allowance [1] 263 301
Recorded investment for which there is a related allowance [1] 0 0
Related allowance [1] $ 0 $ 0
[1] Only classes with impaired loans are shown.
[2] Recorded investment is net of charge-offs and interest paid while a loan is in nonaccrual status.