Note 4 - Loans Receivable and Related Allowance for Loan Losses - Loan Portfolio by Internal Risk Rating (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Loans	$ 810,106	$ 790,403
Residential Portfolio Segment [Member]
Loans	294,286	273,823
Home Equity Loans and Lines of Credit [Member]
Loans	72,699	75,810
Commercial Real Estate Portfolio Segment [Member]
Loans	344,716	326,341
Commercial Portfolio Segment [Member]
Loans	56,026	65,877
Consumer Portfolio Segment [Member]
Loans	42,379	48,552
Not Rated [Member]
Loans	408,217	396,668
Not Rated [Member] | Residential Portfolio Segment [Member]
Loans	293,521	272,722
Not Rated [Member] | Home Equity Loans and Lines of Credit [Member]
Loans	72,383	75,408
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	42,313	48,538
Pass [Member]
Loans	360,963	355,519
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	310,253	295,891
Pass [Member] | Commercial Portfolio Segment [Member]
Loans	50,710	59,628
Pass [Member] | Consumer Portfolio Segment [Member]
Loans	0	0
Special Mention [Member]
Loans	11,840	8,850
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	10,628	7,494
Special Mention [Member] | Commercial Portfolio Segment [Member]
Loans	1,212	1,356
Special Mention [Member] | Consumer Portfolio Segment [Member]
Loans	0	0
Substandard [Member]
Loans	29,086	29,366
Substandard [Member] | Residential Portfolio Segment [Member]
Loans	765	1,101
Substandard [Member] | Home Equity Loans and Lines of Credit [Member]
Loans	316	402
Substandard [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans	23,835	22,956
Substandard [Member] | Commercial Portfolio Segment [Member]
Loans	4,104	4,893
Substandard [Member] | Consumer Portfolio Segment [Member]
Loans	66	14
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