Note 4 - Loans and Allowance for Loan Losses - Aging Analysis of the Recorded Investment of Past Due Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Total loans (Note 4)	$ 491,986	$ 556,760
Recorded investment greater than 90 days and accruing	0	0
Financial Asset, 30 to 59 Days Past Due [Member]
Total loans (Note 4)	538	38
Financial Asset, 60 to 89 Days Past Due [Member]
Total loans (Note 4)	341	33
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Total loans (Note 4)	1,043	1,457
Financial Asset, Past Due [Member]
Total loans (Note 4)	1,922	1,528
Financial Asset, Not Past Due [Member]
Total loans (Note 4)	490,064	555,232
Commercial Portfolio Segment [Member]
Total loans (Note 4)	80,864	132,419
Recorded investment greater than 90 days and accruing	0	0
Commercial Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Total loans (Note 4)	0	0
Commercial Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Total loans (Note 4)	0	0
Commercial Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Total loans (Note 4)	810	889
Commercial Portfolio Segment [Member] | Financial Asset, Past Due [Member]
Total loans (Note 4)	810	889
Commercial Portfolio Segment [Member] | Financial Asset, Not Past Due [Member]
Total loans (Note 4)	80,054	131,530
Commercial Real Estate Portfolio Segment [Member]
Total loans (Note 4)	301,910	317,537
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]
Total loans (Note 4)	491	0
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Total loans (Note 4)	0	0
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Total loans (Note 4)	69	115
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Past Due [Member]
Total loans (Note 4)	560	115
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Not Past Due [Member]
Total loans (Note 4)	301,350	317,422
Residential Portfolio Segment [Member]
Total loans (Note 4)	81,448	79,169
Recorded investment greater than 90 days and accruing	0	0
Residential Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Total loans (Note 4)	40	0
Residential Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Total loans (Note 4)	341	33
Residential Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Total loans (Note 4)	109	398
Residential Portfolio Segment [Member] | Financial Asset, Past Due [Member]
Total loans (Note 4)	490	431
Residential Portfolio Segment [Member] | Financial Asset, Not Past Due [Member]
Total loans (Note 4)	80,958	78,738
Consumer Portfolio Segment [Member]
Total loans (Note 4)	301,910	317,537
Consumer Portfolio Segment [Member] | Home Equity Loan [Member]
Total loans (Note 4)	24,205	24,062
Recorded investment greater than 90 days and accruing	0	0
Consumer Portfolio Segment [Member] | Other Loan [Member]
Total loans (Note 4)	3,559	3,573
Recorded investment greater than 90 days and accruing	0	0
Consumer Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] | Home Equity Loan [Member]
Total loans (Note 4)	0	29
Consumer Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] | Other Loan [Member]
Total loans (Note 4)	7	9
Consumer Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Home Equity Loan [Member]
Total loans (Note 4)	0	0
Consumer Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Other Loan [Member]
Total loans (Note 4)	0	0
Consumer Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Home Equity Loan [Member]
Total loans (Note 4)	55	55
Consumer Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Other Loan [Member]
Total loans (Note 4)	0	0
Consumer Portfolio Segment [Member] | Financial Asset, Past Due [Member] | Home Equity Loan [Member]
Total loans (Note 4)	55	84
Consumer Portfolio Segment [Member] | Financial Asset, Past Due [Member] | Other Loan [Member]
Total loans (Note 4)	7	9
Consumer Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] | Home Equity Loan [Member]
Total loans (Note 4)	24,150	23,978
Consumer Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] | Other Loan [Member]
Total loans (Note 4)	$ 3,552	$ 3,564