Note 5 - Loans - Nonaccrual Loans, Segregated by Loan Class (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Commercial Portfolio Segment [Member]
Nonaccrual loans	$ 1,710	$ 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	800	1,071
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Individual Tax Identification Number Loan [Member]
Nonaccrual loans	3,392	3,649
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Mortgage Receivable [Member]
Nonaccrual loans	1,798	1,775
Residential Portfolio Segment [Member] | Home Equity Loan [Member]
Nonaccrual loans	942
Consumer Portfolio Segment [Member]
Nonaccrual loans	252	32
Nonaccrual loans	$ 10,090	$ 14,009