Note 5 - Loans - Nonaccrual Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Nonaccrual loans	$ 5,616	$ 4,146
Commercial Portfolio Segment [Member]
Nonaccrual loans	61	959
Commercial Portfolio Segment [Member] | Real Estate Loan [Member]
Nonaccrual loans	9,900
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	3,103
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Individual Tax Identification Number Loan [Member]
Nonaccrual loans	2,221	2,388
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Mortgage Receivable [Member]
Nonaccrual loans	191	185
Residential Portfolio Segment [Member] | Home Equity Loan [Member]
Nonaccrual loans		43
Consumer Portfolio Segment [Member]
Nonaccrual loans	$ 40	$ 23