Note 5 - Loans - Nonaccrual Loans, Segregated by Loan Class (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Nonaccrual loans	$ 11,386	$ 14,009
Commercial Portfolio Segment [Member]
Nonaccrual loans	2,749	1,994
Commercial Real Estate Portfolio Segment [Member] | Commercial Non-owner Occupied [Member]
Nonaccrual loans	1,196	5,488
Commercial Real Estate Portfolio Segment [Member] | Commercial Owner Occupied Loan [Member]
Nonaccrual loans	784	1,071
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Individual Tax Identification Number Loan [Member]
Nonaccrual loans	3,576	3,649
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Mortgage Receivable [Member]
Nonaccrual loans	1,914	1,775
Residential Portfolio Segment [Member] | Home Equity Loan [Member]
Nonaccrual loans	917
Consumer Portfolio Segment [Member]
Nonaccrual loans	$ 250	$ 32