Note 4 - Loans - Performing and Nonperforming Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Gross loans	$ 1,036,724	$ 946,251
Commercial Portfolio Segment [Member]
Gross loans	152,303	135,543
Commercial Real Estate Portfolio Segment [Member]
Gross loans	717,102	660,893
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Gross loans	37,685	22,563
Commercial Real Estate Portfolio Segment [Member] | Commercial Non-owner Occupied [Member]
Gross loans	468,706	433,708
Commercial Real Estate Portfolio Segment [Member] | Commercial Owner Occupied Loan [Member]
Gross loans	210,711	204,622
Residential Portfolio Segment [Member]
Gross loans	125,910	98,770
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Individual Tax Identification Number Loan [Member]
Gross loans	35,162	37,446
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Mortgage Receivable [Member]
Gross loans	67,092	34,366
Residential Portfolio Segment [Member] | Home Equity Loan [Member]
Gross loans	23,656	26,958
Consumer Portfolio Segment [Member]
Gross loans	41,409	51,045
Performing Financial Instruments [Member]
Gross loans	1,023,212	942,105
Performing Financial Instruments [Member] | Commercial Portfolio Segment [Member]
Gross loans	152,109	134,584
Performing Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Gross loans	37,685	22,563
Performing Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Non-owner Occupied [Member]
Gross loans	458,016	433,160
Performing Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Owner Occupied Loan [Member]
Gross loans	210,711	204,622
Performing Financial Instruments [Member] | Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Individual Tax Identification Number Loan [Member]
Gross loans	32,773	35,058
Performing Financial Instruments [Member] | Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Mortgage Receivable [Member]
Gross loans	66,875	34,181
Performing Financial Instruments [Member] | Residential Portfolio Segment [Member] | Home Equity Loan [Member]
Gross loans	23,656	26,915
Performing Financial Instruments [Member] | Consumer Portfolio Segment [Member]
Gross loans	41,387	51,022
Nonperforming Financial Instruments [Member]
Gross loans	13,512	4,146
Nonperforming Financial Instruments [Member] | Commercial Portfolio Segment [Member]
Gross loans	194	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	10,690	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	2,389	2,388
Nonperforming Financial Instruments [Member] | Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Mortgage Receivable [Member]
Gross loans	217	185
Nonperforming Financial Instruments [Member] | Residential Portfolio Segment [Member] | Home Equity Loan [Member]
Gross loans		43
Nonperforming Financial Instruments [Member] | Consumer Portfolio Segment [Member]
Gross loans	$ 22	$ 23