Note 4 - Loans - Performing and Nonperforming Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Gross loans	$ 1,034,606	$ 946,251
Commercial Portfolio Segment [Member]
Gross loans	149,575	135,543
Commercial Real Estate Portfolio Segment [Member]
Gross loans	708,482	660,893
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Gross loans	30,335	22,563
Commercial Real Estate Portfolio Segment [Member] | Commercial Non-owner Occupied [Member]
Gross loans	469,048	433,708
Commercial Real Estate Portfolio Segment [Member] | Commercial Owner Occupied Loan [Member]
Gross loans	209,099	204,622
Residential Portfolio Segment [Member]
Gross loans	130,399	98,770
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Individual Tax Identification Number Loan [Member]
Gross loans	36,145	37,446
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Mortgage Receivable [Member]
Gross loans	68,092	34,366
Residential Portfolio Segment [Member] | Home Equity Loan [Member]
Gross loans	26,162	26,958
Consumer Portfolio Segment [Member]
Gross loans	46,150	51,045
Performing Financial Instruments [Member]
Gross loans	1,020,071	942,105
Performing Financial Instruments [Member] | Commercial Portfolio Segment [Member]
Gross loans	148,557	134,584
Performing Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Gross loans	30,335	22,563
Performing Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Non-owner Occupied [Member]
Gross loans	458,170	433,160
Performing Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Owner Occupied Loan [Member]
Gross loans	209,099	204,622
Performing Financial Instruments [Member] | Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Individual Tax Identification Number Loan [Member]
Gross loans	33,753	35,058
Performing Financial Instruments [Member] | Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Mortgage Receivable [Member]
Gross loans	67,910	34,181
Performing Financial Instruments [Member] | Residential Portfolio Segment [Member] | Home Equity Loan [Member]
Gross loans	26,120	26,915
Performing Financial Instruments [Member] | Consumer Portfolio Segment [Member]
Gross loans	46,127	51,022
Nonperforming Financial Instruments [Member]
Gross loans	14,535	4,146
Nonperforming Financial Instruments [Member] | Commercial Portfolio Segment [Member]
Gross loans	1,018	959
Nonperforming Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Gross loans
Nonperforming Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Non-owner Occupied [Member]
Gross loans	10,878	548
Nonperforming Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Owner Occupied Loan [Member]
Gross loans
Nonperforming Financial Instruments [Member] | Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Individual Tax Identification Number Loan [Member]
Gross loans	2,392	2,388
Nonperforming Financial Instruments [Member] | Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Mortgage Receivable [Member]
Gross loans	182	185
Nonperforming Financial Instruments [Member] | Residential Portfolio Segment [Member] | Home Equity Loan [Member]
Gross loans	42	43
Nonperforming Financial Instruments [Member] | Consumer Portfolio Segment [Member]
Gross loans	$ 23	$ 23