Note 4 - Loans - Nonaccrual Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Nonaccrual loans	$ 13,512	$ 4,146
Commercial Portfolio Segment [Member]
Nonaccrual loans	194	959
Commercial Real Estate Portfolio Segment [Member] | Commercial Non-owner Occupied [Member]
Nonaccrual loans	10,690	548
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Individual Tax Identification Number Loan [Member]
Nonaccrual loans	2,389	2,388
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Mortgage Receivable [Member]
Nonaccrual loans	217	185
Residential Portfolio Segment [Member] | Home Equity Loan [Member]
Nonaccrual loans		43
Consumer Portfolio Segment [Member]
Nonaccrual loans	$ 22	$ 23