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Note 3 - Allowance for Loan Losses, Nonperforming Assets and Impaired Loans - Impaired Loans and Associated Reserves (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Principal balance $ 5,520 $ 5,453  
Total recorded investment 4,939 [1] 4,903 [1] $ 5,671
Recorded investment for which there is a related allowance 375 [1] 1,045 [1] 1,114
Related allowance 18 75 110
Recorded investment for which there is no related allowance 4,564 [1] 3,858 [1] $ 4,557
Consumer Real Estate Portfolio Segment [Member] | Investor Owned Residential Real Estate [Member]      
Principal balance [2] 193 194  
Total recorded investment [1],[2] 193 194  
Recorded investment for which there is a related allowance [1],[2] 193 194  
Related allowance [2] 2 2  
Recorded investment for which there is no related allowance [1],[2]   0  
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate, Owner Occupied [Member]      
Principal balance [2] 3,846 3,752  
Total recorded investment [1],[2] 3,265 3,202  
Recorded investment for which there is no related allowance [1],[2] 3,265 3,202  
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Other [Member]      
Principal balance [2] 654 654  
Total recorded investment [1],[2] 654 654  
Recorded investment for which there is no related allowance [1],[2] 654 654  
Commercial Non Real Estate Segment [Member] | Commercial and Industrial [Member]      
Principal balance [2] 826 851  
Total recorded investment [1],[2] 826 851  
Recorded investment for which there is a related allowance [1],[2] 182 851  
Related allowance [2] 16 73  
Consumer Non Real Estate Portfolio Segment [Member] | Automobile Loan [Member]      
Principal balance [2] 1 2  
Total recorded investment [1],[2] 1 2  
Recorded investment for which there is no related allowance [1],[2] $ 1 $ 2  
[1] Recorded investment is net of charge-offs and interest paid while a loan is in nonaccrual status.
[2] Only classes with impaired loans are shown.