Note 4 - Loans - Age Analysis of Past Due Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Loans, past due	$ 5,229	$ 4,916
Loans, current	1,201,111	1,027,987
Gross loans	1,206,340	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	930	1,397
Financial Asset, 60 to 89 Days Past Due [Member]
Loans, past due	107	373
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans, past due	4,192	3,146
Commercial Portfolio Segment [Member]
Loans, past due	23	71
Loans, current	126,001	141,126
Gross loans	126,024	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	23	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	162,189
Gross loans	162,189	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	778,174	739,583
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Loans, past due	0	0
Loans, current	41,371	26,830
Gross loans	41,371	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	519,942	493,920
Gross loans	521,004	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	212,806	215,075
Gross loans	215,799	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	112,777	118,799
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Individual Tax Identification Number Loan [Member]
Loans, past due	362	737
Loans, current	30,721	32,302
Gross loans	31,083	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	474	0
Loans, current	60,282	63,661
Gross loans	60,756	63,661
Recorded investment greater than 90 days and accruing	0	0
Residential Portfolio Segment [Member] | Home Equity Loan [Member]
Loans, past due	148	100
Loans, current	20,790	21,999
Gross loans	20,938	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	196	371
Residential Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] | Real Estate Loan [Member] | Mortgage Receivable [Member]
Loans, past due	443	0
Residential Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] | Home Equity Loan [Member]
Loans, past due	148	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	60	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	106	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	31	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	167	250
Loans, current	27,009	33,074
Gross loans	27,176	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	120	200
Consumer Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loans, past due	47	50
Consumer Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans, past due	$ 0	$ 0