Note 6 - Loans Receivable, Net and Allowance for Loan Losses - Loan Portfolio by Credit Rating (Details) - USD ($) $ in Thousands		Mar. 31, 2022	Dec. 31, 2021
Loans		$ 445,083	$ 411,866
Pass [Member]
Loans		439,696	403,929
Special Mention [Member]
Loans		1,723	2,137
Substandard [Member]
Loans		3,664	5,800
Doubtful [Member]
Loans		0	0
Real Estate Portfolio Segment [Member]
Loans		311,644	282,246
Real Estate Portfolio Segment [Member] | One-to-four Family Residential Owner Occupied Loans [Member]
Loans		12,319	9,779
Real Estate Portfolio Segment [Member] | One-to-four Family Residential Owner Occupied Loans [Member] | Pass [Member]
Loans		12,319	9,365
Real Estate Portfolio Segment [Member] | One-to-four Family Residential Owner Occupied Loans [Member] | Special Mention [Member]
Loans		0	414
Real Estate Portfolio Segment [Member] | One-to-four Family Residential Owner Occupied Loans [Member] | Substandard [Member]
Loans		0	0
Real Estate Portfolio Segment [Member] | One-to-four Family Residential Owner Occupied Loans [Member] | Doubtful [Member]
Loans		0	0
Real Estate Portfolio Segment [Member] | One-to-four Family Residential Non-owner Occupied Loans [Member]
Loans		38,035	38,752
Real Estate Portfolio Segment [Member] | One-to-four Family Residential Non-owner Occupied Loans [Member] | Pass [Member]
Loans		38,026	38,743
Real Estate Portfolio Segment [Member] | One-to-four Family Residential Non-owner Occupied Loans [Member] | Special Mention [Member]
Loans		0	0
Real Estate Portfolio Segment [Member] | One-to-four Family Residential Non-owner Occupied Loans [Member] | Substandard [Member]
Loans		9	9
Real Estate Portfolio Segment [Member] | One-to-four Family Residential Non-owner Occupied Loans [Member] | Doubtful [Member]
Loans		0	0
Real Estate Portfolio Segment [Member] | Multi-family (Five Or More) Residential Loans [Member]
Loans		41,331	29,344
Real Estate Portfolio Segment [Member] | Multi-family (Five Or More) Residential Loans [Member] | Pass [Member]
Loans		39,608	27,621
Real Estate Portfolio Segment [Member] | Multi-family (Five Or More) Residential Loans [Member] | Special Mention [Member]
Loans		1,723	1,723
Real Estate Portfolio Segment [Member] | Multi-family (Five Or More) Residential Loans [Member] | Substandard [Member]
Loans		0	0
Real Estate Portfolio Segment [Member] | Multi-family (Five Or More) Residential Loans [Member] | Doubtful [Member]
Loans		0	0
Real Estate Portfolio Segment [Member] | Commercial Real Estate Loans [Member]
Loans		197,761	183,822
Real Estate Portfolio Segment [Member] | Commercial Real Estate Loans [Member] | Pass [Member]
Loans		195,853	181,914
Real Estate Portfolio Segment [Member] | Commercial Real Estate Loans [Member] | Special Mention [Member]
Loans		0	0
Real Estate Portfolio Segment [Member] | Commercial Real Estate Loans [Member] | Substandard [Member]
Loans		1,908	1,908
Real Estate Portfolio Segment [Member] | Commercial Real Estate Loans [Member] | Doubtful [Member]
Loans		0	0
Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Loans		17,617	15,843
Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Pass [Member]
Loans		17,617	15,843
Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Special Mention [Member]
Loans		0	0
Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Substandard [Member]
Loans		0	0
Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Doubtful [Member]
Loans		0	0
Real Estate Portfolio Segment [Member] | Home Equity Loan [Member]
Loans		4,581	4,706
Real Estate Portfolio Segment [Member] | Home Equity Loan [Member] | Pass [Member]
Loans		4,581	4,706
Real Estate Portfolio Segment [Member] | Home Equity Loan [Member] | Special Mention [Member]
Loans		0	0
Real Estate Portfolio Segment [Member] | Home Equity Loan [Member] | Substandard [Member]
Loans		0	0
Real Estate Portfolio Segment [Member] | Home Equity Loan [Member] | Doubtful [Member]
Loans		0	0
Commercial Portfolio Segment [Member]
Loans	[1]	133,429	129,608
Commercial Portfolio Segment [Member] | Pass [Member]
Loans		131,682	125,725
Commercial Portfolio Segment [Member] | Special Mention [Member]
Loans		0	0
Commercial Portfolio Segment [Member] | Substandard [Member]
Loans		1,747	3,883
Commercial Portfolio Segment [Member] | Doubtful [Member]
Loans		0	0
Consumer Portfolio Segment [Member]
Loans		10	12
Consumer Portfolio Segment [Member] | Pass [Member]
Loans		10	12
Consumer Portfolio Segment [Member] | Special Mention [Member]
Loans		0	0
Consumer Portfolio Segment [Member] | Substandard [Member]
Loans		0	0
Consumer Portfolio Segment [Member] | Doubtful [Member]
Loans		$ 0	$ 0

[1] Includes $23.0 million and $42.6 million of PPP loans at March 31, 2022 and December 31, 2021, respectively.