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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, 2019
Dec. 31, 2018
Jun. 30, 2018
Principal balance $ 7,110 $ 7,211  
Total recorded investment 6,651 [1] 6,820 [1] $ 12,042
Recorded investment for which there is no related allowance 5,167 [1] 5,667 [1] 10,607
Recorded investment for which there is a related allowance 1,484 [1] 1,153 [1] 1,435
Related allowance 129 139 $ 162
Consumer Real Estate Portfolio Segment [Member] | Closed End First Liens [Member]      
Principal balance [2] 889 728  
Total recorded investment [1],[2] 870 719  
Recorded investment for which there is no related allowance [1],[2] 870 719  
Recorded investment for which there is a related allowance [1],[2]  
Related allowance [2]  
Consumer Real Estate Portfolio Segment [Member] | Closed End Junior Liens [Member]      
Principal balance [2] 132 144  
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  
Related allowance [2] 3 4  
Consumer Real Estate Portfolio Segment [Member] | Investor Owned Residential Real Estate [Member]      
Principal balance [2] 580 593  
Total recorded investment [1],[2] 571 590  
Recorded investment for which there is no related allowance [1],[2] 571 590  
Recorded investment for which there is a related allowance [1],[2] 0  
Related allowance [2] 0  
Commercial Real Estate Portfolio Segment [Member] | Multifamily Real Estate [Member]      
Principal balance [2] 471 485  
Total recorded investment [1],[2] 461 483  
Recorded investment for which there is no related allowance [1],[2] 461 483  
Recorded investment for which there is a related allowance [1],[2] 0  
Related allowance [2] 0 0  
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate, Owner Occupied [Member]      
Principal balance [2] 1,196 1,363  
Total recorded investment [1],[2] 1,179 1,363  
Recorded investment for which there is no related allowance [1],[2] 790 1,363  
Recorded investment for which there is a related allowance [1],[2] 389  
Related allowance [2] 2  
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Other [Member]      
Principal balance [2] 2,867 2,867  
Total recorded investment [1],[2] 2,467 2,494  
Recorded investment for which there is no related allowance [1],[2] 2,467 2,494  
Recorded investment for which there is a related allowance [1],[2] 0 0  
Related allowance [2] 0 0  
Commercial Non Real Estate Segment [Member] | Commercial and Industrial [Member]      
Principal balance [2] 968 1,018  
Total recorded investment [1],[2] 964 1,015  
Recorded investment for which there is no related allowance [1],[2] 1 5  
Recorded investment for which there is a related allowance [1],[2] 963 1,010  
Related allowance [2] 124 135  
Consumer Non Real Estate Portfolio Segment [Member] | Automobile Loan [Member]      
Principal balance [2] 7 13  
Total recorded investment [1],[2] 7 13  
Recorded investment for which there is no related allowance [1],[2] 7 13  
Recorded investment for which there is a related allowance [1],[2]  
Related allowance [2] $ 0  
[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.