Note 5 - Loans - Nonaccrual Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Nonaccrual loans	$ 4,146	$ 5,799
Commercial Portfolio Segment [Member]
Nonaccrual loans	959	1,603
Commercial Real Estate Portfolio Segment [Member] | Commercial Non-owner Occupied [Member]
Nonaccrual loans	548
Commercial Real Estate Portfolio Segment [Member] | Commercial Owner Occupied Loan [Member]
Nonaccrual loans		600
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Individual Tax Identification Number Loan [Member]
Nonaccrual loans	2,388	2,909
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Mortgage Receivable [Member]
Nonaccrual loans	185	606
Residential Portfolio Segment [Member] | Home Equity Loan [Member]
Nonaccrual loans	43	45
Consumer Portfolio Segment [Member]
Nonaccrual loans	$ 23	$ 36