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Note 4 - Loans and Allowance for Loan Losses - Nonaccrual Loans and Loans Past Due 90 Days or More and Still Accruing (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Loans past due 90 days and still accruing $ 968 $ 327
Nonaccrual 8,351 8,961
Residential Portfolio Segment [Member]    
Loans past due 90 days and still accruing 316 132
Nonaccrual 4,452 3,445
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Owner Occupied [Member]    
Loans past due 90 days and still accruing 28
Nonaccrual 308 1,571
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Nonowner Occupied [Member]    
Loans past due 90 days and still accruing 21
Nonaccrual 2,624 2,506
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]    
Loans past due 90 days and still accruing
Nonaccrual 402 527
Commercial and Industrial Portfolio Segment [Member]    
Loans past due 90 days and still accruing 15
Nonaccrual 345 867
Consumer Portfolio Segment [Member] | Automobile Loan [Member]    
Loans past due 90 days and still accruing 90 121
Nonaccrual 75 5
Consumer Portfolio Segment [Member] | Home Equity Loan [Member]    
Loans past due 90 days and still accruing 390
Nonaccrual 35 34
Consumer Portfolio Segment [Member] | Other Consumer Loans [Member]    
Loans past due 90 days and still accruing 136 46
Nonaccrual $ 110 $ 6