Note 4 - Loans and Allowance for Loan Losses - Aging of Recorded Investment in Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Financing Receivable	$ 572,899	$ 566,548
Financial Asset Acquired with Credit Deterioration [Member]
Financing Receivable		286
Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable	3,087	2,765
Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable	248	576
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable	506	846
Financial Asset, Past Due [Member]
Financing Receivable	3,841	4,187
Financial Asset, Not Past Due [Member]
Financing Receivable	569,058	562,075
Residential Portfolio Segment [Member] | One-to-four Family Loan [Member]
Financing Receivable	122,802
Residential Portfolio Segment [Member] | One-to-four Family Loan [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable	2,114
Residential Portfolio Segment [Member] | One-to-four Family Loan [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable	0
Residential Portfolio Segment [Member] | One-to-four Family Loan [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable	384
Residential Portfolio Segment [Member] | One-to-four Family Loan [Member] | Financial Asset, Past Due [Member]
Financing Receivable	2,498
Residential Portfolio Segment [Member] | One-to-four Family Loan [Member] | Financial Asset, Not Past Due [Member]
Financing Receivable	120,304
Residential Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]
Financing Receivable	58,340
Residential Portfolio Segment [Member] | Multifamily [Member]
Financing Receivable	39,642
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	39,642
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]
Financing Receivable	58,340	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	638	206
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable	0	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	70	93
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member] | Financial Asset, Past Due [Member]
Financing Receivable	708	577
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member] | Financial Asset, Not Past Due [Member]
Financing Receivable	57,632	58,756
Consumer Portfolio Segment [Member] | All Other Consumer Excluding Home Equity and Second Mortgage [Member]
Financing Receivable	54,053	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	213	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	48	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	261	287
Consumer Portfolio Segment [Member] | All Other Consumer Excluding Home Equity and Second Mortgage [Member] | Financial Asset, Not Past Due [Member]
Financing Receivable	53,792	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	161,877	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	58	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	58	0
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member] | Financial Asset, Not Past Due [Member]
Financing Receivable	161,819	161,675
Construction [Member] | One-to-four Family Residential Construction [Member]
Financing Receivable	19,071
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	19,071
Construction [Member] | Other Construction, Development and Land [Member]
Financing Receivable	49,898
Construction [Member] | Other Construction, Development and Land [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable	50
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	102
Construction [Member] | Other Construction, Development and Land [Member] | Financial Asset, Not Past Due [Member]
Financing Receivable	49,796
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	67,216
Commercial Portfolio Segment [Member] | Commercial Business [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable	14
Commercial Portfolio Segment [Member] | Commercial Business [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable	200
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	214
Commercial Portfolio Segment [Member] | Commercial Business [Member] | Financial Asset, Not Past Due [Member]
Financing Receivable	$ 67,002