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	Jun. 30, 2017	Dec. 31, 2016
Nonaccrual	$ 7,483	$ 8,961
Loans past due 90 days and still accruing	741	327
Residential Portfolio Segment [Member]
Nonaccrual	3,366	3,445
Loans past due 90 days and still accruing	185	132
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Owner Occupied [Member]
Nonaccrual	384	1,571
Loans past due 90 days and still accruing		28
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Nonowner Occupied [Member]
Nonaccrual	2,713	2,506
Loans past due 90 days and still accruing
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Nonaccrual	447	527
Loans past due 90 days and still accruing
Commercial and Industrial Portfolio Segment [Member]
Nonaccrual	468	867
Loans past due 90 days and still accruing	70
Consumer Portfolio Segment [Member] | Automobile Loan [Member]
Nonaccrual	30	5
Loans past due 90 days and still accruing	110	121
Consumer Portfolio Segment [Member] | Home Equity Loan [Member]
Nonaccrual	17	34
Loans past due 90 days and still accruing	235
Consumer Portfolio Segment [Member] | Other Consumer Loans [Member]
Nonaccrual	58	6
Loans past due 90 days and still accruing	$ 141	$ 46