Note 4 - Loans - Internal Risk Rating by Loan Class (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
Pass [Member]
Gross loans	1,099,586	948,864
Pass [Member] | Commercial Portfolio Segment [Member]
Gross loans	106,597	125,222
Pass [Member] | SBA CARES Act Paycheck Protection Program [Member]
Gross loans	163,493
Pass [Member] | Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Gross loans	37,839	26,810
Pass [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Non-owner Occupied [Member]
Gross loans	508,803	454,493
Pass [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Owner Occupied Loan [Member]
Gross loans	155,290	195,950
Pass [Member] | Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Individual Tax Identification Number Loan [Member]
Gross loans	26,583	28,609
Pass [Member] | Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Mortgage Receivable [Member]
Gross loans	56,213	62,485
Pass [Member] | Residential Portfolio Segment [Member] | Home Equity Loan [Member]
Gross loans	20,296	22,012
Pass [Member] | Consumer Portfolio Segment [Member]
Gross loans	24,472	33,283
Watch [Member]
Gross loans	74,542	56,105
Watch [Member] | Commercial Portfolio Segment [Member]
Gross loans	8,736	14,974
Watch [Member] | SBA CARES Act Paycheck Protection Program [Member]
Gross loans	0
Watch [Member] | Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Gross loans	2,450	20
Watch [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Non-owner Occupied [Member]
Gross loans	21,859	32,902
Watch [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Owner Occupied Loan [Member]
Gross loans	41,289	7,224
Watch [Member] | Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Individual Tax Identification Number Loan [Member]
Gross loans	0	0
Watch [Member] | Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Mortgage Receivable [Member]
Gross loans	208	985
Watch [Member] | Residential Portfolio Segment [Member] | Home Equity Loan [Member]
Gross loans	0	0
Watch [Member] | Consumer Portfolio Segment [Member]
Gross loans	0	0
Special Mention [Member]
Gross loans	6,480	7,477
Special Mention [Member] | Commercial Portfolio Segment [Member]
Gross loans	125	833
Special Mention [Member] | SBA CARES Act Paycheck Protection Program [Member]
Gross loans	0
Special Mention [Member] | Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Gross loans	0	0
Special Mention [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Non-owner Occupied [Member]
Gross loans	6,355	5,424
Special Mention [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Owner Occupied Loan [Member]
Gross loans	0	1,220
Special Mention [Member] | Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Individual Tax Identification Number Loan [Member]
Gross loans	0	0
Special Mention [Member] | Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Mortgage Receivable [Member]
Gross loans	0	0
Special Mention [Member] | Residential Portfolio Segment [Member] | Home Equity Loan [Member]
Gross loans	0	0
Special Mention [Member] | Consumer Portfolio Segment [Member]
Gross loans	0	0
Substandard [Member]
Gross loans	25,457	20,457
Substandard [Member] | Commercial Portfolio Segment [Member]
Gross loans	5,567	168
Substandard [Member] | SBA CARES Act Paycheck Protection Program [Member]
Gross loans	0
Substandard [Member] | Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Gross loans	0	0
Substandard [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Non-owner Occupied [Member]
Gross loans	1,062	1,101
Substandard [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Owner Occupied Loan [Member]
Gross loans	13,876	14,439
Substandard [Member] | Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Individual Tax Identification Number Loan [Member]
Gross loans	3,488	4,430
Substandard [Member] | Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Mortgage Receivable [Member]
Gross loans	1,446	191
Substandard [Member] | Residential Portfolio Segment [Member] | Home Equity Loan [Member]
Gross loans	0	87
Substandard [Member] | Consumer Portfolio Segment [Member]
Gross loans	18	41
Doubtful [Member]
Gross loans	0	0
Doubtful [Member] | Commercial Portfolio Segment [Member]
Gross loans	0	0
Doubtful [Member] | SBA CARES Act Paycheck Protection Program [Member]
Gross loans	0
Doubtful [Member] | Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Gross loans	0	0
Doubtful [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Non-owner Occupied [Member]
Gross loans	0	0
Doubtful [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Owner Occupied Loan [Member]
Gross loans	0	0
Doubtful [Member] | Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Individual Tax Identification Number Loan [Member]
Gross loans	0	0
Doubtful [Member] | Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Mortgage Receivable [Member]
Gross loans	0	0
Doubtful [Member] | Residential Portfolio Segment [Member] | Home Equity Loan [Member]
Gross loans	0	0
Doubtful [Member] | Consumer Portfolio Segment [Member]
Gross loans	$ 0	$ 0