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Note 3 - Allowance for Loan Losses, Nonperforming Assets and Impaired Loans - Past Due and Nonaccrual Loans (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Loans past due 90 days or more and still accruing $ 63 [1] $ 51 [1] $ 250
Nonaccruals 3,076 [1],[2] 2,769 [1],[2] $ 3,156
Consumer Real Estate Portfolio Segment [Member] | Equity Lines [Member]      
Loans past due 90 days or more and still accruing [1]    
Nonaccruals [1],[2]    
Consumer Real Estate Portfolio Segment [Member] | Closed End First Liens [Member]      
Loans past due 90 days or more and still accruing [1] 38 11  
Nonaccruals [1],[2] 163 145  
Consumer Real Estate Portfolio Segment [Member] | Closed End Junior Liens [Member]      
Loans past due 90 days or more and still accruing [1] 0  
Nonaccruals [1],[2] 0 0  
Consumer Real Estate Portfolio Segment [Member] | Investor Owned Residential Real Estate [Member]      
Loans past due 90 days or more and still accruing [1] 0 0  
Nonaccruals [1],[2] 200 6  
Commercial Real Estate Portfolio Segment [Member] | Multifamily Real Estate [Member]      
Loans past due 90 days or more and still accruing [1] 0 0  
Nonaccruals [1],[2] 195  
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate, Owner Occupied [Member]      
Loans past due 90 days or more and still accruing [1] 0 0  
Nonaccruals [1],[2]  
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Other [Member]      
Loans past due 90 days or more and still accruing [1] 0 0  
Nonaccruals [1],[2] 2,510 2,602  
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]      
Loans past due 90 days or more and still accruing [1]   0  
Nonaccruals [1],[2]   15  
Commercial Non Real Estate Segment [Member] | Commercial and Industrial [Member]      
Loans past due 90 days or more and still accruing [1]    
Nonaccruals [1],[2] 8    
Consumer Non Real Estate Portfolio Segment [Member] | Credit Card Receivable [Member]      
Loans past due 90 days or more and still accruing [1] 5 12  
Nonaccruals [1],[2] 0 0  
Consumer Non Real Estate Portfolio Segment [Member] | Automobile Loan [Member]      
Loans past due 90 days or more and still accruing [1] 10 22  
Nonaccruals [1],[2] 1  
Consumer Non Real Estate Portfolio Segment [Member] | Other Consumer Loans [Member]      
Loans past due 90 days or more and still accruing [1] 10 6  
Nonaccruals [1],[2] 0 0  
Financing Receivables 30 to 89 Days Past Due [Member]      
Loans past due and accruing [1] 2,768 2,263  
Financing Receivables 30 to 89 Days Past Due [Member] | Consumer Real Estate Portfolio Segment [Member] | Equity Lines [Member]      
Loans past due and accruing [1] 70    
Financing Receivables 30 to 89 Days Past Due [Member] | Consumer Real Estate Portfolio Segment [Member] | Closed End First Liens [Member]      
Loans past due and accruing [1] 1,388 637  
Financing Receivables 30 to 89 Days Past Due [Member] | Consumer Real Estate Portfolio Segment [Member] | Closed End Junior Liens [Member]      
Loans past due and accruing [1] 12 188  
Financing Receivables 30 to 89 Days Past Due [Member] | Consumer Real Estate Portfolio Segment [Member] | Investor Owned Residential Real Estate [Member]      
Loans past due and accruing [1] 54 66  
Financing Receivables 30 to 89 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member] | Multifamily Real Estate [Member]      
Loans past due and accruing [1] 294 303  
Financing Receivables 30 to 89 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate, Owner Occupied [Member]      
Loans past due and accruing [1] 379 402  
Financing Receivables 30 to 89 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Other [Member]      
Loans past due and accruing [1] 0 0  
Financing Receivables 30 to 89 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]      
Loans past due and accruing [1]   131  
Financing Receivables 30 to 89 Days Past Due [Member] | Commercial Non Real Estate Segment [Member] | Commercial and Industrial [Member]      
Loans past due and accruing [1] 196    
Financing Receivables 30 to 89 Days Past Due [Member] | Consumer Non Real Estate Portfolio Segment [Member] | Credit Card Receivable [Member]      
Loans past due and accruing [1] 7 7  
Financing Receivables 30 to 89 Days Past Due [Member] | Consumer Non Real Estate Portfolio Segment [Member] | Automobile Loan [Member]      
Loans past due and accruing [1] 322 375  
Financing Receivables 30 to 89 Days Past Due [Member] | Consumer Non Real Estate Portfolio Segment [Member] | Other Consumer Loans [Member]      
Loans past due and accruing [1] 46 154  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]      
Loans past due and accruing [1] 2,793 2,658  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Consumer Real Estate Portfolio Segment [Member] | Equity Lines [Member]      
Loans past due and accruing [1]    
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Consumer Real Estate Portfolio Segment [Member] | Closed End First Liens [Member]      
Loans past due and accruing [1] 63 16  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Consumer Real Estate Portfolio Segment [Member] | Closed End Junior Liens [Member]      
Loans past due and accruing [1] 0  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Consumer Real Estate Portfolio Segment [Member] | Investor Owned Residential Real Estate [Member]      
Loans past due and accruing [1]  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member] | Multifamily Real Estate [Member]      
Loans past due and accruing [1] 195  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate, Owner Occupied [Member]      
Loans past due and accruing [1] 0  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Other [Member]      
Loans past due and accruing [1] 2,510 2,602  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]      
Loans past due and accruing [1]    
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Non Real Estate Segment [Member] | Commercial and Industrial [Member]      
Loans past due and accruing [1]    
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Consumer Non Real Estate Portfolio Segment [Member] | Credit Card Receivable [Member]      
Loans past due and accruing [1] 5 12  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Consumer Non Real Estate Portfolio Segment [Member] | Automobile Loan [Member]      
Loans past due and accruing [1] 10 22  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Consumer Non Real Estate Portfolio Segment [Member] | Other Consumer Loans [Member]      
Loans past due and accruing [1] $ 10 $ 6  
[1] Only classes with past-due or nonaccrual loans are shown.
[2] Includes current and past due loans in nonaccrual status. Includes impaired loans in nonaccrual status.