Note 4 - Loans and Allowance for Loan Losses - Summary of Credit Quality Indicators by Internally Assigned Grades (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Total loans (Note 4)	$ 534,146	$ 518,716
Commercial Portfolio Segment [Member]
Total loans (Note 4)	123,403	99,864
Consumer Portfolio Segment [Member]
Total loans (Note 4)	303,404	302,084
Pass [Member] | Commercial Portfolio Segment [Member]
Total loans (Note 4)	110,811	83,114
Pass [Member] | Consumer Portfolio Segment [Member]
Total loans (Note 4)	266,770	275,763
Special Mention [Member] | Commercial Portfolio Segment [Member]
Total loans (Note 4)	2,570	6,273
Special Mention [Member] | Consumer Portfolio Segment [Member]
Total loans (Note 4)	22,000	21,995
Substandard [Member] | Commercial Portfolio Segment [Member]
Total loans (Note 4)	10,022	10,477
Substandard [Member] | Consumer Portfolio Segment [Member]
Total loans (Note 4)	$ 14,634	$ 4,326