Note 5 - Loans - Nonaccrual Loans, Segregated by Loan Class (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Nonaccrual loans	$ 9,154	$ 11,386
Commercial Portfolio Segment [Member]
Nonaccrual loans	2,410	2,749
Commercial Real Estate Portfolio Segment [Member] | Commercial Non-owner Occupied [Member]
Nonaccrual loans	1,196	1,196
Commercial Real Estate Portfolio Segment [Member] | Commercial Owner Occupied Loan [Member]
Nonaccrual loans	639	784
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Individual Tax Identification Number Loan [Member]
Nonaccrual loans	3,346	3,576
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Mortgage Receivable [Member]
Nonaccrual loans	653	1,914
Residential Portfolio Segment [Member] | Home Equity Loan [Member]
Nonaccrual loans	872	917
Consumer Portfolio Segment [Member]
Nonaccrual loans	$ 38	$ 250