Note 4 - Loans - Performing and Nonperforming Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Gross loans	$ 1,033,082	$ 946,251
Commercial Portfolio Segment [Member]
Gross loans	152,195	135,543
Commercial Real Estate Portfolio Segment [Member]
Gross loans	722,051	660,893
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Gross loans	35,606	22,563
Commercial Real Estate Portfolio Segment [Member] | Commercial Non-owner Occupied [Member]
Gross loans	475,678	433,708
Commercial Real Estate Portfolio Segment [Member] | Commercial Owner Occupied Loan [Member]
Gross loans	210,767	204,622
Residential Portfolio Segment [Member]
Gross loans	121,512	98,770
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Individual Tax Identification Number Loan [Member]
Gross loans	34,036	37,446
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Mortgage Receivable [Member]
Gross loans	64,747	34,366
Residential Portfolio Segment [Member] | Home Equity Loan [Member]
Gross loans	22,729	26,958
Consumer Portfolio Segment [Member]
Gross loans	37,324	51,045
Performing Financial Instruments [Member]
Gross loans	1,020,286	942,105
Performing Financial Instruments [Member] | Commercial Portfolio Segment [Member]
Gross loans	152,056	134,584
Performing Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Gross loans	35,606	22,563
Performing Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Non-owner Occupied [Member]
Gross loans	465,579	433,160
Performing Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Owner Occupied Loan [Member]
Gross loans	210,767	204,622
Performing Financial Instruments [Member] | Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Individual Tax Identification Number Loan [Member]
Gross loans	31,697	35,058
Performing Financial Instruments [Member] | Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Mortgage Receivable [Member]
Gross loans	64,549	34,181
Performing Financial Instruments [Member] | Residential Portfolio Segment [Member] | Home Equity Loan [Member]
Gross loans	22,729	26,915
Performing Financial Instruments [Member] | Consumer Portfolio Segment [Member]
Gross loans	37,303	51,022
Nonperforming Financial Instruments [Member]
Gross loans	12,796	4,146
Nonperforming Financial Instruments [Member] | Commercial Portfolio Segment [Member]
Gross loans	139	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	10,099	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	2,339	2,388
Nonperforming Financial Instruments [Member] | Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Mortgage Receivable [Member]
Gross loans	198	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	$ 21	$ 23