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Note 3 - Allowance for Loan Losses, Nonperforming Assets and Impaired Loans - Impaired Loans and Associated Reserves (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Jun. 30, 2021
Principal balance $ 6,453 $ 6,478  
Total recorded investment 5,809 [1] 5,878 [1] $ 6,774
Recorded investment for which there is no related allowance 5,809 [1] 5,878 [1] 6,774
Recorded investment for which there is a related allowance 0 0 [1] 0
Related allowance (0) (0) $ (0)
Consumer Real Estate Portfolio Segment [Member] | Investor Owned Residential Real Estate [Member]      
Principal balance 188 191  
Total recorded investment [1] 188 191  
Recorded investment for which there is no related allowance [1] 188 191  
Recorded investment for which there is a related allowance 0 0 [1]  
Related allowance 0 0  
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate, Owner Occupied [Member]      
Principal balance 3,252 3,256  
Total recorded investment [1] 2,624 2,665  
Recorded investment for which there is no related allowance [1] 2,624 2,665  
Recorded investment for which there is a related allowance 0 0 [1]  
Related allowance 0 0  
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Other [Member]      
Principal balance 2,718 2,721  
Total recorded investment [1] 2,718 2,721  
Recorded investment for which there is no related allowance [1] 2,718 2,721  
Recorded investment for which there is a related allowance 0 0 [1]  
Related allowance 0 0  
Commercial Non Real Estate Segment [Member] | Commercial and Industrial [Member]      
Principal balance 295 310  
Total recorded investment [1] 279 301  
Recorded investment for which there is no related allowance [1] 279 301  
Recorded investment for which there is a related allowance 0 0 [1]  
Related allowance $ 0 $ 0  
[1] Recorded investment is net of charge-offs and interest paid while a loan is in nonaccrual status.