Note 4 - Loans - Age Analysis of Past Due Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Loans, past due	$ 4,374	$ 4,916
Loans, current	1,201,691	1,027,987
Gross loans	1,206,065	1,032,903
Recorded investment greater than 90 days and accruing	0	0
Financial Asset, 30 to 59 Days Past Due [Member]
Loans, past due	149	1,397
Financial Asset, 60 to 89 Days Past Due [Member]
Loans, past due	65	373
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans, past due	4,160	3,146
Commercial Portfolio Segment [Member]
Loans, past due	0	71
Loans, current	121,025	141,126
Gross loans	121,025	141,197
Recorded investment greater than 90 days and accruing	0	0
Commercial Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Loans, past due	0	71
Commercial Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loans, past due	0	0
Commercial Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans, past due	0	0
SBA CARES Act Paycheck Protection Program [Member]
Loans, past due	0
Loans, current	163,493
Gross loans	163,493	0
Recorded investment greater than 90 days and accruing	0
SBA CARES Act Paycheck Protection Program [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Loans, past due	0
SBA CARES Act Paycheck Protection Program [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loans, past due	0
SBA CARES Act Paycheck Protection Program [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans, past due	0
Commercial Real Estate Portfolio Segment [Member]
Gross loans	788,823	739,583
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Loans, past due	0	0
Loans, current	40,289	26,830
Gross loans	40,289	26,830
Recorded investment greater than 90 days and accruing	0	0
Commercial Real Estate Portfolio Segment [Member] | Commercial Non-owner Occupied [Member]
Loans, past due	1,062	0
Loans, current	537,017	493,920
Gross loans	538,079	493,920
Recorded investment greater than 90 days and accruing	0	0
Commercial Real Estate Portfolio Segment [Member] | Commercial Owner Occupied Loan [Member]
Loans, past due	2,993	3,758
Loans, current	207,462	215,075
Gross loans	210,455	218,833
Recorded investment greater than 90 days and accruing	0	0
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] | Construction Loans [Member]
Loans, past due	0	0
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] | Commercial Non-owner Occupied [Member]
Loans, past due	0	0
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] | Commercial Owner Occupied Loan [Member]
Loans, past due	0	655
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Construction Loans [Member]
Loans, past due	0	0
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Commercial Non-owner Occupied [Member]
Loans, past due	0	0
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Commercial Owner Occupied Loan [Member]
Loans, past due	0	0
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Construction Loans [Member]
Loans, past due	0	0
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial Non-owner Occupied [Member]
Loans, past due	1,062	0
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial Owner Occupied Loan [Member]
Loans, past due	2,993	3,103
Residential Portfolio Segment [Member]
Gross loans	108,234	118,799
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Individual Tax Identification Number Loan [Member]
Loans, past due	181	737
Loans, current	29,890	32,302
Gross loans	30,071	33,039
Recorded investment greater than 90 days and accruing	0	0
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Mortgage Receivable [Member]
Loans, past due	0	0
Loans, current	57,867	63,661
Gross loans	57,867	63,661
Recorded investment greater than 90 days and accruing	0	0
Residential Portfolio Segment [Member] | Home Equity Loan [Member]
Loans, past due	15	100
Loans, current	20,281	21,999
Gross loans	20,296	22,099
Recorded investment greater than 90 days and accruing	0	0
Residential Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] | Real Estate Loan [Member] | Individual Tax Identification Number Loan [Member]
Loans, past due	76	371
Residential Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] | Real Estate Loan [Member] | Mortgage Receivable [Member]
Loans, past due	0	0
Residential Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] | Home Equity Loan [Member]
Loans, past due	15	100
Residential Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Real Estate Loan [Member] | Individual Tax Identification Number Loan [Member]
Loans, past due	0	323
Residential Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Real Estate Loan [Member] | Mortgage Receivable [Member]
Loans, past due	0	0
Residential Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Home Equity Loan [Member]
Loans, past due	0	0
Residential Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Real Estate Loan [Member] | Individual Tax Identification Number Loan [Member]
Loans, past due	105	43
Residential Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Real Estate Loan [Member] | Mortgage Receivable [Member]
Loans, past due	0	0
Residential Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Home Equity Loan [Member]
Loans, past due	0	0
Consumer Portfolio Segment [Member]
Loans, past due	123	250
Loans, current	24,367	33,074
Gross loans	24,490	33,324
Recorded investment greater than 90 days and accruing	0	0
Consumer Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Loans, past due	58	200
Consumer Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loans, past due	65	50
Consumer Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans, past due	$ 0	$ 0