Note 4 - Loans - Performing and Nonperforming Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Gross loans	$ 1,052,245	$ 1,032,903
Commercial Portfolio Segment [Member]
Gross loans	138,870	141,197
Commercial Real Estate Portfolio Segment [Member]
Gross loans	765,765	739,583
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Gross loans	34,394	26,830
Commercial Real Estate Portfolio Segment [Member] | Commercial Non-owner Occupied [Member]
Gross loans	514,052	493,920
Commercial Real Estate Portfolio Segment [Member] | Commercial Owner Occupied Loan [Member]
Gross loans	217,319	218,833
Residential Portfolio Segment [Member]
Gross loans	117,689	118,799
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Individual Tax Identification Number Loan [Member]
Gross loans	31,998	33,039
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Mortgage Receivable [Member]
Gross loans	62,533	63,661
Residential Portfolio Segment [Member] | Home Equity Loan [Member]
Gross loans	23,158	22,099
Consumer Portfolio Segment [Member]
Gross loans	29,921	33,324
Performing Financial Instruments [Member]
Gross loans	1,047,000	1,027,287
Performing Financial Instruments [Member] | Commercial Portfolio Segment [Member]
Gross loans	138,831	141,136
Performing Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Gross loans	34,394	26,830
Performing Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Non-owner Occupied [Member]
Gross loans	514,052	493,920
Performing Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Owner Occupied Loan [Member]
Gross loans	214,216	215,730
Performing Financial Instruments [Member] | Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Individual Tax Identification Number Loan [Member]
Gross loans	30,120	30,818
Performing Financial Instruments [Member] | Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Mortgage Receivable [Member]
Gross loans	62,349	63,470
Performing Financial Instruments [Member] | Residential Portfolio Segment [Member] | Home Equity Loan [Member]
Gross loans	23,158	22,099
Performing Financial Instruments [Member] | Consumer Portfolio Segment [Member]
Gross loans	29,880	33,284
Nonperforming Financial Instruments [Member]
Gross loans	5,245	5,616
Nonperforming Financial Instruments [Member] | Commercial Portfolio Segment [Member]
Gross loans	39	61
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
Nonperforming Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Owner Occupied Loan [Member]
Gross loans	3,103	3,103
Nonperforming Financial Instruments [Member] | Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Individual Tax Identification Number Loan [Member]
Gross loans	1,878	2,221
Nonperforming Financial Instruments [Member] | Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Mortgage Receivable [Member]
Gross loans	184	191
Nonperforming Financial Instruments [Member] | Residential Portfolio Segment [Member] | Home Equity Loan [Member]
Gross loans
Nonperforming Financial Instruments [Member] | Consumer Portfolio Segment [Member]
Gross loans	$ 41	$ 40