Note 4 - Loans - Performing and Nonperforming Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Gross loans	$ 1,206,340	$ 1,032,903
Commercial Portfolio Segment [Member]
Gross loans	126,024	141,197
SBA CARES Act Paycheck Protection Program [Member]
Gross loans	162,189	0
Commercial Real Estate Portfolio Segment [Member]
Gross loans	778,174	739,583
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Gross loans	41,371	26,830
Commercial Real Estate Portfolio Segment [Member] | Commercial Non-owner Occupied [Member]
Gross loans	521,004	493,920
Commercial Real Estate Portfolio Segment [Member] | Commercial Owner Occupied Loan [Member]
Gross loans	215,799	218,833
Residential Portfolio Segment [Member]
Gross loans	112,777	118,799
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Individual Tax Identification Number Loan [Member]
Gross loans	31,083	33,039
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Mortgage Receivable [Member]
Gross loans	60,756	63,661
Residential Portfolio Segment [Member] | Home Equity Loan [Member]
Gross loans	20,938	22,099
Consumer Portfolio Segment [Member]
Gross loans	27,176	33,324
Performing Financial Instruments [Member]
Gross loans	1,199,669	1,027,287
Performing Financial Instruments [Member] | Commercial Portfolio Segment [Member]
Gross loans	126,017	141,136
Performing Financial Instruments [Member] | SBA CARES Act Paycheck Protection Program [Member]
Gross loans	162,189
Performing Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Gross loans	41,371	26,830
Performing Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Non-owner Occupied [Member]
Gross loans	519,942	493,920
Performing Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Owner Occupied Loan [Member]
Gross loans	212,152	215,730
Performing Financial Instruments [Member] | Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Individual Tax Identification Number Loan [Member]
Gross loans	29,345	30,818
Performing Financial Instruments [Member] | Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Mortgage Receivable [Member]
Gross loans	60,576	63,470
Performing Financial Instruments [Member] | Residential Portfolio Segment [Member] | Home Equity Loan [Member]
Gross loans	20,938	22,099
Performing Financial Instruments [Member] | Consumer Portfolio Segment [Member]
Gross loans	27,139	33,284
Nonperforming Financial Instruments [Member]
Gross loans	6,671	5,616
Nonperforming Financial Instruments [Member] | Commercial Portfolio Segment [Member]
Gross loans	7	61
Nonperforming Financial Instruments [Member] | SBA CARES Act Paycheck Protection Program [Member]
Gross loans	0
Nonperforming Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Gross loans	0	0
Nonperforming Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Non-owner Occupied [Member]
Gross loans	1,062	0
Nonperforming Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Owner Occupied Loan [Member]
Gross loans	3,647	3,103
Nonperforming Financial Instruments [Member] | Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Individual Tax Identification Number Loan [Member]
Gross loans	1,738	2,221
Nonperforming Financial Instruments [Member] | Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Mortgage Receivable [Member]
Gross loans	180	191
Nonperforming Financial Instruments [Member] | Residential Portfolio Segment [Member] | Home Equity Loan [Member]
Gross loans	0	0
Nonperforming Financial Instruments [Member] | Consumer Portfolio Segment [Member]
Gross loans	$ 37	$ 40