Note 3 - Loans Receivable and Related Allowance for Loan Losses - Loan Portfolio by Internal Risk Rating (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Loans	$ 790,403	$ 809,918
Residential Portfolio Segment [Member]
Loans	273,823	308,031
Home Equity Loans and Lines of Credit [Member]
Loans	75,810	87,088
Commercial Real Estate Portfolio Segment [Member]
Loans	326,341	285,625
Commercial Portfolio Segment [Member]
Loans	65,877	89,139
Consumer Portfolio Segment [Member]
Loans	48,552	40,035
Not Rated [Member]
Loans	396,668	433,091
Not Rated [Member] | Residential Portfolio Segment [Member]
Loans	272,722	306,237
Not Rated [Member] | Home Equity Loans and Lines of Credit [Member]
Loans	75,408	86,867
Not Rated [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans	0	0
Not Rated [Member] | Commercial Portfolio Segment [Member]
Loans	0	0
Not Rated [Member] | Consumer Portfolio Segment [Member]
Loans	48,538	39,987
Pass [Member]
Loans	355,519	332,416
Pass [Member] | Residential Portfolio Segment [Member]
Loans	0	0
Pass [Member] | Home Equity Loans and Lines of Credit [Member]
Loans	0	0
Pass [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans	295,891	249,357
Pass [Member] | Commercial Portfolio Segment [Member]
Loans	59,628	83,059
Pass [Member] | Consumer Portfolio Segment [Member]
Loans	0	0
Special Mention [Member]
Loans	8,850	21,723
Special Mention [Member] | Residential Portfolio Segment [Member]
Loans	0	0
Special Mention [Member] | Home Equity Loans and Lines of Credit [Member]
Loans	0	0
Special Mention [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans	7,494	19,669
Special Mention [Member] | Commercial Portfolio Segment [Member]
Loans	1,356	2,054
Special Mention [Member] | Consumer Portfolio Segment [Member]
Loans	0	0
Substandard [Member]
Loans	29,366	22,688
Substandard [Member] | Residential Portfolio Segment [Member]
Loans	1,101	1,794
Substandard [Member] | Home Equity Loans and Lines of Credit [Member]
Loans	402	221
Substandard [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans	22,956	16,599
Substandard [Member] | Commercial Portfolio Segment [Member]
Loans	4,893	4,026
Substandard [Member] | Consumer Portfolio Segment [Member]
Loans	14	48
Doubtful [Member]
Loans	0	0
Doubtful [Member] | Residential Portfolio Segment [Member]
Loans	0	0
Doubtful [Member] | Home Equity Loans and Lines of Credit [Member]
Loans	0	0
Doubtful [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans	0	0
Doubtful [Member] | Commercial Portfolio Segment [Member]
Loans	0	0
Doubtful [Member] | Consumer Portfolio Segment [Member]
Loans	$ 0	$ 0