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Note 3 - Allowance for Loan Losses, Nonperforming Assets and Impaired Loans - Impaired Loans and Associated Reserves (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Principal balance $ 6,696 $ 7,211  
Impaired loans with no valuation allowance 5,163 [1] 5,667 [1] $ 10,530
Impaired loans with a valuation allowance 1,070 [1] 1,153 [1] 1,404
Related allowance 120 139 156
Total recorded investment 6,233 [1] 6,820 [1] 11,934
Recorded investment for which there is no related allowance 5,163 [1] 5,667 [1] 10,530
Recorded investment for which there is a related allowance 1,070 [1] 1,153 [1] $ 1,404
Consumer Real Estate Portfolio Segment [Member] | Equity Lines [Member]      
Principal balance [1],[2] 98    
Impaired loans with no valuation allowance [1],[2] 98    
Impaired loans with a valuation allowance [1],[2]    
Related allowance [2]    
Recorded investment for which there is no related allowance [1],[2] 98    
Recorded investment for which there is a related allowance [1],[2]    
Consumer Real Estate Portfolio Segment [Member] | Closed End First Liens [Member]      
Principal balance [2] 749 728  
Impaired loans with no valuation allowance [1],[2] 737 719  
Impaired loans with a valuation allowance [1],[2]  
Related allowance [2]  
Total recorded investment [1],[2] 737 719  
Recorded investment for which there is no related allowance [1],[2] 737 719  
Recorded investment for which there is a related allowance [1],[2]  
Consumer Real Estate Portfolio Segment [Member] | Closed End Junior Liens [Member]      
Principal balance [2] 132 144  
Impaired loans with no valuation allowance [1],[2] 0 0  
Impaired loans with a valuation allowance [1],[2] 132 143  
Related allowance [2] 3 4  
Total recorded investment [1],[2] 132 143  
Recorded investment for which there is no related allowance [1],[2] 0 0  
Recorded investment for which there is a related allowance [1],[2] 132 143  
Consumer Real Estate Portfolio Segment [Member] | Investor Owned Residential Real Estate [Member]      
Principal balance [2] 441 593  
Impaired loans with no valuation allowance [1],[2] 431 590  
Impaired loans with a valuation allowance [1],[2] 0  
Related allowance [2] 0  
Total recorded investment [1],[2] 431 590  
Recorded investment for which there is no related allowance [1],[2] 431 590  
Recorded investment for which there is a related allowance [1],[2] 0  
Commercial Real Estate Portfolio Segment [Member] | Multifamily Real Estate [Member]      
Principal balance [2] 281 485  
Impaired loans with no valuation allowance [1],[2] 281 483  
Impaired loans with a valuation allowance [1],[2] 0  
Related allowance [2] 0 0  
Total recorded investment [1],[2] 281 483  
Recorded investment for which there is no related allowance [1],[2] 281 483  
Recorded investment for which there is a related allowance [1],[2] 0  
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate, Owner Occupied [Member]      
Principal balance [2] 1,185 1,363  
Impaired loans with no valuation allowance [1],[2] 1,160 1,363  
Impaired loans with a valuation allowance [1],[2]  
Related allowance [2]  
Total recorded investment [1],[2] 1,160 1,363  
Recorded investment for which there is no related allowance [1],[2] 1,160 1,363  
Recorded investment for which there is a related allowance [1],[2]  
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Other [Member]      
Principal balance [2] 2,867 2,867  
Impaired loans with no valuation allowance [1],[2] 2,451 2,494  
Impaired loans with a valuation allowance [1],[2] 0 0  
Related allowance [2] 0 0  
Total recorded investment [1],[2] 2,451 2,494  
Recorded investment for which there is no related allowance [1],[2] 2,451 2,494  
Recorded investment for which there is a related allowance [1],[2] 0 0  
Commercial Non Real Estate Segment [Member] | Commercial and Industrial [Member]      
Principal balance [2] 938 1,018  
Impaired loans with no valuation allowance [1],[2] 5  
Impaired loans with a valuation allowance [1],[2] 938 1,010  
Related allowance [2] 117 135  
Total recorded investment [1],[2] 938 1,015  
Recorded investment for which there is no related allowance [1],[2] 5  
Recorded investment for which there is a related allowance [1],[2] 938 1,010  
Consumer Non Real Estate Portfolio Segment [Member] | Automobile Loan [Member]      
Principal balance [2] 5 13  
Impaired loans with no valuation allowance [1],[2] 5 13  
Impaired loans with a valuation allowance [1],[2]  
Related allowance [2] 0  
Total recorded investment [1],[2] 5 13  
Recorded investment for which there is no related allowance [1],[2] 5 13  
Recorded investment for which there is a related allowance [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.