Note 4 - Loans - Performing and Nonperforming Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Gross loans	$ 1,206,065	$ 1,032,903
Commercial Portfolio Segment [Member]
Gross loans	121,025	141,197
SBA CARES Act Paycheck Protection Program [Member]
Gross loans	163,493	0
Commercial Real Estate Portfolio Segment [Member]
Gross loans	788,823	739,583
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Gross loans	40,289	26,830
Commercial Real Estate Portfolio Segment [Member] | Commercial Non-owner Occupied [Member]
Gross loans	538,079	493,920
Commercial Real Estate Portfolio Segment [Member] | Commercial Owner Occupied Loan [Member]
Gross loans	210,455	218,833
Residential Portfolio Segment [Member]
Gross loans	108,234	118,799
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Individual Tax Identification Number Loan [Member]
Gross loans	30,071	33,039
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Mortgage Receivable [Member]
Gross loans	57,867	63,661
Residential Portfolio Segment [Member] | Home Equity Loan [Member]
Gross loans	20,296	22,099
Consumer Portfolio Segment [Member]
Gross loans	24,490	33,324
Performing Financial Instruments [Member]
Gross loans	1,197,967	1,027,287
Performing Financial Instruments [Member] | Commercial Portfolio Segment [Member]
Gross loans	119,476	141,136
Performing Financial Instruments [Member] | SBA CARES Act Paycheck Protection Program [Member]
Gross loans	163,493
Performing Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Gross loans	40,289	26,830
Performing Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Non-owner Occupied [Member]
Gross loans	537,017	493,920
Performing Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Owner Occupied Loan [Member]
Gross loans	206,705	215,730
Performing Financial Instruments [Member] | Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Individual Tax Identification Number Loan [Member]
Gross loans	28,497	30,818
Performing Financial Instruments [Member] | Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Mortgage Receivable [Member]
Gross loans	57,722	63,470
Performing Financial Instruments [Member] | Residential Portfolio Segment [Member] | Home Equity Loan [Member]
Gross loans	20,296	22,099
Performing Financial Instruments [Member] | Consumer Portfolio Segment [Member]
Gross loans	24,472	33,284
Nonperforming Financial Instruments [Member]
Gross loans	8,098	5,616
Nonperforming Financial Instruments [Member] | Commercial Portfolio Segment [Member]
Gross loans	1,549	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	3,750	3,103
Nonperforming Financial Instruments [Member] | Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Individual Tax Identification Number Loan [Member]
Gross loans	1,574	2,221
Nonperforming Financial Instruments [Member] | Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Mortgage Receivable [Member]
Gross loans	145	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	$ 18	$ 40