Note 4 - Loans and Allowance for Loan Losses - Aging of Recorded Investment in Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Financing Receivable	$ 610,105	$ 566,548
Financial Asset Acquired with Credit Deterioration [Member]
Financing Receivable		286
Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable	1,973	2,765
Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable	691	576
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable	562	846
Financial Asset, Past Due [Member]
Financing Receivable	3,226	4,187
Financial Asset, Not Past Due [Member]
Financing Receivable	606,879	562,075
Residential Portfolio Segment [Member] \| One-to-four Family Loan [Member]
Financing Receivable	132,786
Residential Portfolio Segment [Member] \| One-to-four Family Loan [Member] \| Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable	1,466
Residential Portfolio Segment [Member] \| One-to-four Family Loan [Member] \| Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable	601
Residential Portfolio Segment [Member] \| One-to-four Family Loan [Member] \| Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable	510
Residential Portfolio Segment [Member] \| One-to-four Family Loan [Member] \| Financial Asset, Past Due [Member]
Financing Receivable	2,577
Residential Portfolio Segment [Member] \| One-to-four Family Loan [Member] \| Financial Asset, Not Past Due [Member]
Financing Receivable	130,209
Residential Portfolio Segment [Member] \| Home Equity and Second Mortgage [Member]
Financing Receivable	61,052
Residential Portfolio Segment [Member] \| Multifamily [Member]
Financing Receivable	40,152
Residential Portfolio Segment [Member] \| Multifamily [Member] \| Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable	0
Residential Portfolio Segment [Member] \| Multifamily [Member] \| Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable	0
Residential Portfolio Segment [Member] \| Multifamily [Member] \| Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable	0
Residential Portfolio Segment [Member] \| Multifamily [Member] \| Financial Asset, Past Due [Member]
Financing Receivable	0
Residential Portfolio Segment [Member] \| Multifamily [Member] \| Financial Asset, Not Past Due [Member]
Financing Receivable	40,152
Consumer Portfolio Segment [Member] \| Home Equity and Second Mortgage [Member]
Financing Receivable	61,052	59,333
Consumer Portfolio Segment [Member] \| Home Equity and Second Mortgage [Member] \| Financial Asset Acquired with Credit Deterioration [Member]
Financing Receivable		0
Consumer Portfolio Segment [Member] \| Home Equity and Second Mortgage [Member] \| Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable	211	206
Consumer Portfolio Segment [Member] \| Home Equity and Second Mortgage [Member] \| Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable	59	278
Consumer Portfolio Segment [Member] \| Home Equity and Second Mortgage [Member] \| Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable	0	93
Consumer Portfolio Segment [Member] \| Home Equity and Second Mortgage [Member] \| Financial Asset, Past Due [Member]
Financing Receivable	270	577
Consumer Portfolio Segment [Member] \| Home Equity and Second Mortgage [Member] \| Financial Asset, Not Past Due [Member]
Financing Receivable	60,782	58,756
Consumer Portfolio Segment [Member] \| All Other Consumer Excluding Home Equity and Second Mortgage [Member]
Financing Receivable	56,659	64,265
Consumer Portfolio Segment [Member] \| All Other Consumer Excluding Home Equity and Second Mortgage [Member] \| Financial Asset Acquired with Credit Deterioration [Member]
Financing Receivable		0
Consumer Portfolio Segment [Member] \| All Other Consumer Excluding Home Equity and Second Mortgage [Member] \| Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable	193	211
Consumer Portfolio Segment [Member] \| All Other Consumer Excluding Home Equity and Second Mortgage [Member] \| Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable	31	72
Consumer Portfolio Segment [Member] \| All Other Consumer Excluding Home Equity and Second Mortgage [Member] \| Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable	0	4
Consumer Portfolio Segment [Member] \| All Other Consumer Excluding Home Equity and Second Mortgage [Member] \| Financial Asset, Past Due [Member]
Financing Receivable	224	287
Consumer Portfolio Segment [Member] \| All Other Consumer Excluding Home Equity and Second Mortgage [Member] \| Financial Asset, Not Past Due [Member]
Financing Receivable	56,435	63,978
Real Estate Mortgage Portfolio Segment [Member] \| Residential Loan [Member]
Financing Receivable		155,938
Real Estate Mortgage Portfolio Segment [Member] \| Residential Loan [Member] \| Financial Asset Acquired with Credit Deterioration [Member]
Financing Receivable		286
Real Estate Mortgage Portfolio Segment [Member] \| Residential Loan [Member] \| Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable		2,229
Real Estate Mortgage Portfolio Segment [Member] \| Residential Loan [Member] \| Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable		226
Real Estate Mortgage Portfolio Segment [Member] \| Residential Loan [Member] \| Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable		543
Real Estate Mortgage Portfolio Segment [Member] \| Residential Loan [Member] \| Financial Asset, Past Due [Member]
Financing Receivable		2,998
Real Estate Mortgage Portfolio Segment [Member] \| Residential Loan [Member] \| Financial Asset, Not Past Due [Member]
Financing Receivable		152,654
Real Estate Mortgage Portfolio Segment [Member] \| Land Loan [Member]
Financing Receivable		21,997
Real Estate Mortgage Portfolio Segment [Member] \| Land Loan [Member] \| Financial Asset Acquired with Credit Deterioration [Member]
Financing Receivable		0
Real Estate Mortgage Portfolio Segment [Member] \| Land Loan [Member] \| Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable		119
Real Estate Mortgage Portfolio Segment [Member] \| Land Loan [Member] \| Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable		0
Real Estate Mortgage Portfolio Segment [Member] \| Land Loan [Member] \| Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable		51
Real Estate Mortgage Portfolio Segment [Member] \| Land Loan [Member] \| Financial Asset, Past Due [Member]
Financing Receivable		170
Real Estate Mortgage Portfolio Segment [Member] \| Land Loan [Member] \| Financial Asset, Not Past Due [Member]
Financing Receivable		21,827
Real Estate Mortgage Portfolio Segment [Member] \| Construction Loans [Member]
Financing Receivable		42,364
Real Estate Mortgage Portfolio Segment [Member] \| Construction Loans [Member] \| Financial Asset Acquired with Credit Deterioration [Member]
Financing Receivable		0
Real Estate Mortgage Portfolio Segment [Member] \| Construction Loans [Member] \| Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable		0
Real Estate Mortgage Portfolio Segment [Member] \| Construction Loans [Member] \| Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable		0
Real Estate Mortgage Portfolio Segment [Member] \| Construction Loans [Member] \| Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable		0
Real Estate Mortgage Portfolio Segment [Member] \| Construction Loans [Member] \| Financial Asset, Past Due [Member]
Financing Receivable		0
Real Estate Mortgage Portfolio Segment [Member] \| Construction Loans [Member] \| Financial Asset, Not Past Due [Member]
Financing Receivable		42,364
Real Estate Mortgage Portfolio Segment [Member] \| Commercial Real Estate Loan [Member]
Financing Receivable	171,037	161,675
Real Estate Mortgage Portfolio Segment [Member] \| Commercial Real Estate Loan [Member] \| Financial Asset Acquired with Credit Deterioration [Member]
Financing Receivable		0
Real Estate Mortgage Portfolio Segment [Member] \| Commercial Real Estate Loan [Member] \| Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable	103	0
Real Estate Mortgage Portfolio Segment [Member] \| Commercial Real Estate Loan [Member] \| Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable	0	0
Real Estate Mortgage Portfolio Segment [Member] \| Commercial Real Estate Loan [Member] \| Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable	0	0
Real Estate Mortgage Portfolio Segment [Member] \| Commercial Real Estate Loan [Member] \| Financial Asset, Past Due [Member]
Financing Receivable	103	0
Real Estate Mortgage Portfolio Segment [Member] \| Commercial Real Estate Loan [Member] \| Financial Asset, Not Past Due [Member]
Financing Receivable	170,934	161,675
Construction [Member] \| One-to-four Family Residential Construction [Member]
Financing Receivable	15,936
Construction [Member] \| One-to-four Family Residential Construction [Member] \| Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable	0
Construction [Member] \| One-to-four Family Residential Construction [Member] \| Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable	0
Construction [Member] \| One-to-four Family Residential Construction [Member] \| Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable	0
Construction [Member] \| One-to-four Family Residential Construction [Member] \| Financial Asset, Past Due [Member]
Financing Receivable	0
Construction [Member] \| One-to-four Family Residential Construction [Member] \| Financial Asset, Not Past Due [Member]
Financing Receivable	15,936
Construction [Member] \| Other Construction, Development and Land [Member]
Financing Receivable	66,589
Construction [Member] \| Other Construction, Development and Land [Member] \| Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable	0
Construction [Member] \| Other Construction, Development and Land [Member] \| Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable	0
Construction [Member] \| Other Construction, Development and Land [Member] \| Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable	52
Construction [Member] \| Other Construction, Development and Land [Member] \| Financial Asset, Past Due [Member]
Financing Receivable	52
Construction [Member] \| Other Construction, Development and Land [Member] \| Financial Asset, Not Past Due [Member]
Financing Receivable	66,537
Commercial Portfolio Segment [Member]
Financing Receivable		60,976
Commercial Portfolio Segment [Member] \| Financial Asset Acquired with Credit Deterioration [Member]
Financing Receivable		0
Commercial Portfolio Segment [Member] \| Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable		0
Commercial Portfolio Segment [Member] \| Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable		0
Commercial Portfolio Segment [Member] \| Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable		155
Commercial Portfolio Segment [Member] \| Financial Asset, Past Due [Member]
Financing Receivable		155
Commercial Portfolio Segment [Member] \| Financial Asset, Not Past Due [Member]
Financing Receivable		$ 60,821
Commercial Portfolio Segment [Member] \| Commercial Business [Member]
Financing Receivable	65,894
Commercial Portfolio Segment [Member] \| Commercial Business [Member] \| Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable	0
Commercial Portfolio Segment [Member] \| Commercial Business [Member] \| Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable	0
Commercial Portfolio Segment [Member] \| Commercial Business [Member] \| Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable	0
Commercial Portfolio Segment [Member] \| Commercial Business [Member] \| Financial Asset, Past Due [Member]
Financing Receivable	0
Commercial Portfolio Segment [Member] \| Commercial Business [Member] \| Financial Asset, Not Past Due [Member]
Financing Receivable	$ 65,894

Note 4 - Loans and Allowance for Loan Losses - Aging of Recorded Investment in Loans (Details) - USD ($)
$ in Thousands

Sep. 30, 2023

Dec. 31, 2022

Financing Receivable

$ 610,105

$ 566,548

Financial Asset Acquired with Credit Deterioration [Member]

Financing Receivable

286

Financial Asset, 30 to 59 Days Past Due [Member]

Financing Receivable

1,973