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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, 2018
Dec. 31, 2017
Loans past due 90 days and still accruing $ 1,056 $ 334
Nonaccrual 9,577 10,112
Residential Portfolio Segment [Member]    
Loans past due 90 days and still accruing 167 131
Nonaccrual 6,929 5,906
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Owner Occupied [Member]    
Loans past due 90 days and still accruing
Nonaccrual 494 476
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Nonowner Occupied [Member]    
Loans past due 90 days and still accruing
Nonaccrual 1,142 2,454
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]    
Loans past due 90 days and still accruing
Nonaccrual 389 444
Commercial and Industrial Portfolio Segment [Member]    
Loans past due 90 days and still accruing 147
Nonaccrual 284 337
Consumer Portfolio Segment [Member] | Automobile Loan [Member]    
Loans past due 90 days and still accruing 247 127
Nonaccrual 45 86
Consumer Portfolio Segment [Member] | Home Equity Loan [Member]    
Loans past due 90 days and still accruing 122
Nonaccrual 227 283
Consumer Portfolio Segment [Member] | Other Consumer Loans [Member]    
Loans past due 90 days and still accruing 373 76
Nonaccrual $ 67 $ 126