Note 4 - Loans - Nonaccrual Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Nonaccrual loans	$ 14,535	$ 4,146
Commercial Portfolio Segment [Member]
Nonaccrual loans	1,018	959
Commercial Real Estate Portfolio Segment [Member] | Commercial Non-owner Occupied [Member]
Nonaccrual loans	10,878	548
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Individual Tax Identification Number Loan [Member]
Nonaccrual loans	2,392	2,388
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Mortgage Receivable [Member]
Nonaccrual loans	182	185
Residential Portfolio Segment [Member] | Home Equity Loan [Member]
Nonaccrual loans	42	43
Consumer Portfolio Segment [Member]
Nonaccrual loans	$ 23	$ 23