Note 4 - Loans - Nonaccrual Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Nonaccrual loans	$ 7,605	$ 11,386
Commercial Portfolio Segment [Member]
Nonaccrual loans	2,309	2,749
Commercial Real Estate Portfolio Segment [Member] | Commercial Non-owner Occupied [Member]
Nonaccrual loans		1,196
Commercial Real Estate Portfolio Segment [Member] | Commercial Owner Occupied Loan [Member]
Nonaccrual loans	617	784
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Individual Tax Identification Number Loan [Member]
Nonaccrual loans	3,201	3,576
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Mortgage Receivable [Member]
Nonaccrual loans	626	1,914
Residential Portfolio Segment [Member] | Home Equity Loan [Member]
Nonaccrual loans	815	917
Consumer Portfolio Segment [Member]
Nonaccrual loans	$ 37	$ 250