Note 4 - Loans and Allowance for Credit Losses - Aging of Recorded Investment in Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Loans	$ 638,584	$ 622,414
Residential Portfolio Segment [Member] | One-to-four Family Loan [Member]
Loans	137,329	133,601
Residential Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]
Loans	64,661	63,301
Residential Portfolio Segment [Member] | Multifamily [Member]
Loans	37,207	39,946
Construction [Member] | One-to-four Family Residential Construction [Member]
Loans	14,400	15,667
Construction [Member] | Other Construction, Development and Land [Member]
Loans	83,261	76,669
Commercial Portfolio Segment [Member] | Commercial Real Estate Loan [Member]
Loans	177,347	168,645
Commercial Portfolio Segment [Member] | Commercial Business [Member]
Loans	64,685	68,212
Consumer Portfolio Segment [Member] | Other Consumer Loan [Member]
Loans	59,694	56,373
Financial Asset, 30 to 59 Days Past Due [Member]
Loans	2,626	3,798
Financial Asset, 30 to 59 Days Past Due [Member] | Residential Portfolio Segment [Member] | One-to-four Family Loan [Member]
Loans	1,293	2,104
Financial Asset, 30 to 59 Days Past Due [Member] | Residential Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]
Loans	586	396
Financial Asset, 30 to 59 Days Past Due [Member] | Residential Portfolio Segment [Member] | Multifamily [Member]
Loans	0	0
Financial Asset, 30 to 59 Days Past Due [Member] | Construction [Member] | One-to-four Family Residential Construction [Member]
Loans	0	0
Financial Asset, 30 to 59 Days Past Due [Member] | Construction [Member] | Other Construction, Development and Land [Member]
Loans	165	162
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Commercial Real Estate Loan [Member]
Loans	0	834
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Commercial Business [Member]
Loans	286	0
Financial Asset, 30 to 59 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Other Consumer Loan [Member]
Loans	296	302
Financial Asset, 60 to 89 Days Past Due [Member]
Loans	1,165	456
Financial Asset, 60 to 89 Days Past Due [Member] | Residential Portfolio Segment [Member] | One-to-four Family Loan [Member]
Loans	111	335
Financial Asset, 60 to 89 Days Past Due [Member] | Residential Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]
Loans	78	70
Financial Asset, 60 to 89 Days Past Due [Member] | Residential Portfolio Segment [Member] | Multifamily [Member]
Loans	0	0
Financial Asset, 60 to 89 Days Past Due [Member] | Construction [Member] | One-to-four Family Residential Construction [Member]
Loans	0	0
Financial Asset, 60 to 89 Days Past Due [Member] | Construction [Member] | Other Construction, Development and Land [Member]
Loans	59	0
Financial Asset, 60 to 89 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Commercial Real Estate Loan [Member]
Loans	718	0
Financial Asset, 60 to 89 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Commercial Business [Member]
Loans	142	0
Financial Asset, 60 to 89 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Other Consumer Loan [Member]
Loans	57	51
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans	1,284	536
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Residential Portfolio Segment [Member] | One-to-four Family Loan [Member]
Loans	1,082	482
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Residential Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]
Loans	61	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Residential Portfolio Segment [Member] | Multifamily [Member]
Loans	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Construction [Member] | One-to-four Family Residential Construction [Member]
Loans	87	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Construction [Member] | Other Construction, Development and Land [Member]
Loans	54	54
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Commercial Real Estate Loan [Member]
Loans	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Commercial Business [Member]
Loans	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Other Consumer Loan [Member]
Loans	0	0
Financial Asset, Past Due [Member]
Loans	5,075	4,790
Financial Asset, Past Due [Member] | Residential Portfolio Segment [Member] | One-to-four Family Loan [Member]
Loans	2,486	2,921
Financial Asset, Past Due [Member] | Residential Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]
Loans	725	466
Financial Asset, Past Due [Member] | Residential Portfolio Segment [Member] | Multifamily [Member]
Loans	0	0
Financial Asset, Past Due [Member] | Construction [Member] | One-to-four Family Residential Construction [Member]
Loans	87	0
Financial Asset, Past Due [Member] | Construction [Member] | Other Construction, Development and Land [Member]
Loans	278	216
Financial Asset, Past Due [Member] | Commercial Portfolio Segment [Member] | Commercial Real Estate Loan [Member]
Loans	718	834
Financial Asset, Past Due [Member] | Commercial Portfolio Segment [Member] | Commercial Business [Member]
Loans	428	0
Financial Asset, Past Due [Member] | Consumer Portfolio Segment [Member] | Other Consumer Loan [Member]
Loans	353	353
Financial Asset, Not Past Due [Member]
Loans	633,509	617,624
Financial Asset, Not Past Due [Member] | Residential Portfolio Segment [Member] | One-to-four Family Loan [Member]
Loans	134,843	130,680
Financial Asset, Not Past Due [Member] | Residential Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]
Loans	63,936	62,835
Financial Asset, Not Past Due [Member] | Residential Portfolio Segment [Member] | Multifamily [Member]
Loans	37,207	39,946
Financial Asset, Not Past Due [Member] | Construction [Member] | One-to-four Family Residential Construction [Member]
Loans	14,313	15,667
Financial Asset, Not Past Due [Member] | Construction [Member] | Other Construction, Development and Land [Member]
Loans	82,983	76,453
Financial Asset, Not Past Due [Member] | Commercial Portfolio Segment [Member] | Commercial Real Estate Loan [Member]
Loans	176,629	167,811
Financial Asset, Not Past Due [Member] | Commercial Portfolio Segment [Member] | Commercial Business [Member]
Loans	64,257	68,212
Financial Asset, Not Past Due [Member] | Consumer Portfolio Segment [Member] | Other Consumer Loan [Member]
Loans	$ 59,341	$ 56,020