Note 5 - Loans - Performing and Nonperforming Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Gross loans	$ 1,032,903	$ 946,251
Commercial Portfolio Segment [Member]
Gross loans	141,197	135,543
Commercial Real Estate Portfolio Segment [Member]
Gross loans	739,583	660,893
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Gross loans	26,830	22,563
Commercial Real Estate Portfolio Segment [Member] | Commercial Non-owner Occupied [Member]
Gross loans	493,920	433,708
Commercial Real Estate Portfolio Segment [Member] | Commercial Owner Occupied Loan [Member]
Gross loans	218,833	204,622
Residential Portfolio Segment [Member]
Gross loans	118,799	98,770
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Individual Tax Identification Number Loan [Member]
Gross loans	33,039	37,446
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Mortgage Receivable [Member]
Gross loans	63,661	34,366
Residential Portfolio Segment [Member] | Home Equity Loan [Member]
Gross loans	22,099	26,958
Consumer Portfolio Segment [Member]
Gross loans	33,324	51,045
Performing Financial Instruments [Member]
Gross loans	1,027,287	942,105
Performing Financial Instruments [Member] | Commercial Portfolio Segment [Member]
Gross loans	141,136	134,584
Performing Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Gross loans	26,830	22,563
Performing Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Non-owner Occupied [Member]
Gross loans	493,920	433,160
Performing Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Owner Occupied Loan [Member]
Gross loans	215,730	204,622
Performing Financial Instruments [Member] | Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Individual Tax Identification Number Loan [Member]
Gross loans	30,818	35,058
Performing Financial Instruments [Member] | Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Mortgage Receivable [Member]
Gross loans	63,470	34,181
Performing Financial Instruments [Member] | Residential Portfolio Segment [Member] | Home Equity Loan [Member]
Gross loans	22,099	26,915
Performing Financial Instruments [Member] | Consumer Portfolio Segment [Member]
Gross loans	33,284	51,022
Nonperforming Financial Instruments [Member]
Gross loans	5,616	4,146
Nonperforming Financial Instruments [Member] | Commercial Portfolio Segment [Member]
Gross loans	61	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		548
Nonperforming Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Owner Occupied Loan [Member]
Gross loans	3,103
Nonperforming Financial Instruments [Member] | Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Individual Tax Identification Number Loan [Member]
Gross loans	2,221	2,388
Nonperforming Financial Instruments [Member] | Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Mortgage Receivable [Member]
Gross loans	191	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	$ 40	$ 23