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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, 2017
Dec. 31, 2016
Sep. 30, 2016
Loans past due 90 days or more and still accruing $ 250 [1] $ 63 [1] $ 195
Nonaccruals 3,156 [1],[2] 5,855 [1],[2] $ 5,493
Consumer Real Estate Portfolio Segment [Member] | Closed End First Liens [Member]      
Loans past due 90 days or more and still accruing [1] 88 6  
Nonaccruals [1],[2] 266 0  
Consumer Real Estate Portfolio Segment [Member] | Closed End Junior Liens [Member]      
Loans past due 90 days or more and still accruing [1] 0 36  
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] 0 253  
Consumer Real Estate Portfolio Segment [Member] | Equity Lines [Member]      
Loans past due 90 days or more and still accruing [1]   0  
Nonaccruals [1],[2]   0  
Real Estate Construction Portfolio Segment[Member] | Construction Residential [Member]      
Loans past due 90 days or more and still accruing [1]   0  
Nonaccruals [1],[2]   270  
Real Estate Construction Portfolio Segment[Member] | Construction, Other [Member]      
Loans past due 90 days or more and still accruing [1]   0  
Nonaccruals [1],[2]   0  
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] 0 1,091  
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] 128 1,183  
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] 2,629 2,814  
Commercial Non Real Estate Segment [Member] | Commercial and Industrial [Member]      
Loans past due 90 days or more and still accruing [1] 0    
Nonaccruals [1],[2] 131    
Consumer Non Real Estate Portfolio Segment [Member] | Credit Card Receivable [Member]      
Loans past due 90 days or more and still accruing [1] 16 5  
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] 22 12  
Nonaccruals [1],[2] 2 3  
Consumer Non Real Estate Portfolio Segment [Member] | Other Consumer Loans [Member]      
Loans past due 90 days or more and still accruing [1] 124 4  
Nonaccruals [1],[2] 0 0  
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]      
Loans past due 90 days or more and still accruing [1]   0  
Nonaccruals [1],[2]   241  
Financing Receivables 30 to 89 Days Past Due [Member]      
Loans past due and accruing [1] 2,543 2,553  
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] 901 1,498  
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] 197 114  
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] 1 56  
Financing Receivables 30 to 89 Days Past Due [Member] | Consumer Real Estate Portfolio Segment [Member] | Equity Lines [Member]      
Loans past due and accruing [1]   10  
Financing Receivables 30 to 89 Days Past Due [Member] | Real Estate Construction Portfolio Segment[Member] | Construction Residential [Member]      
Loans past due and accruing [1]   0  
Financing Receivables 30 to 89 Days Past Due [Member] | Real Estate Construction Portfolio Segment[Member] | Construction, Other [Member]      
Loans past due and accruing [1]   25  
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] 307 132  
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] 676 339  
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 Non Real Estate Segment [Member] | Commercial and Industrial [Member]      
Loans past due and accruing [1] 65    
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 8  
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] 295 234  
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] 94 131  
Financing Receivables 30 to 89 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]      
Loans past due and accruing [1]   6  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]      
Loans past due and accruing [1] 257 1,888  
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] 88 6  
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 36  
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] 7 234  
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]   0  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Real Estate Construction Portfolio Segment[Member] | Construction Residential [Member]      
Loans past due and accruing [1]   0  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Real Estate Construction Portfolio Segment[Member] | Construction, Other [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] | Multifamily Real Estate [Member]      
Loans past due and accruing [1] 0 1,091  
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] 0 202  
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] 0 80  
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] 0    
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] 16 5  
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] 22 12  
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] $ 124 4  
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]   $ 218  
[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.