Note 5 - 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, 2016	Dec. 31, 2015
Residential Portfolio Segment [Member]
Loans past due 90 days and still accruing	$ 152	$ 20
Nonaccrual	3,387	2,048
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Owner Occupied [Member]
Loans past due 90 days and still accruing	207
Nonaccrual	1,575	404
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Nonowner Occupied [Member]
Loans past due 90 days and still accruing
Nonaccrual	2,711	2,737
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Loans past due 90 days and still accruing
Nonaccrual	544	769
Commercial and Industrial Portfolio Segment [Member]
Loans past due 90 days and still accruing
Nonaccrual	661	1,152
Consumer Portfolio Segment [Member] | Automobile Loan [Member]
Loans past due 90 days and still accruing	53	18
Nonaccrual	16	27
Consumer Portfolio Segment [Member] | Home Equity Loan [Member]
Loans past due 90 days and still accruing
Nonaccrual	35	96
Consumer Portfolio Segment [Member] | Other Consumer Loans [Member]
Loans past due 90 days and still accruing	31	1
Nonaccrual	98	3
Loans past due 90 days and still accruing	443	39
Nonaccrual	$ 9,027	$ 7,236