Note 4 - Loans and Allowance for Credit Losses - Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Beginning balance	$ 8,005
Provision for credit losses	280	$ 193
Charge-offs	(100)	(275)
Recoveries	45	72
Ending balance	8,230	7,323
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]
Beginning balance		561
Prior to Adoption of Asc 326 [Member]
Beginning balance		6,772
Residential Portfolio Segment [Member] | One-to-four Family Loan [Member]
Beginning balance	1,490
Provision for credit losses	(152)	(43)
Charge-offs	(1)	(2)
Recoveries	1	0
Ending balance	1,338	1,414
Residential Portfolio Segment [Member] | One-to-four Family Loan [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]
Beginning balance		423
Residential Portfolio Segment [Member] | One-to-four Family Loan [Member] | Prior to Adoption of Asc 326 [Member]
Beginning balance		1,036
Residential Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]
Charge-offs	0
Residential Portfolio Segment [Member] | Multifamily [Member]
Beginning balance	332
Provision for credit losses	91	38
Charge-offs	0	0
Recoveries	0	0
Ending balance	423	381
Residential Portfolio Segment [Member] | Multifamily [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]
Beginning balance		(3)
Residential Portfolio Segment [Member] | Multifamily [Member] | Prior to Adoption of Asc 326 [Member]
Beginning balance		346
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]
Beginning balance	406
Provision for credit losses	35	(139)
Charge-offs	0	0
Recoveries	3	0
Ending balance	444	366
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]
Beginning balance		(26)
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member] | Prior to Adoption of Asc 326 [Member]
Beginning balance		531
Consumer Portfolio Segment [Member] | All Other Consumer Excluding Home Equity and Second Mortgage [Member]
Beginning balance	1,215
Provision for credit losses	(190)	(53)
Charge-offs	(99)	(118)
Recoveries	40	67
Ending balance	966	1,212
Consumer Portfolio Segment [Member] | All Other Consumer Excluding Home Equity and Second Mortgage [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]
Beginning balance		435
Consumer Portfolio Segment [Member] | All Other Consumer Excluding Home Equity and Second Mortgage [Member] | Prior to Adoption of Asc 326 [Member]
Beginning balance		881
Construction [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]
Beginning balance		13
Construction [Member] | One-to-four Family Residential Construction [Member]
Beginning balance	208
Provision for credit losses	(16)	(10)
Charge-offs	0	0
Recoveries	0	0
Ending balance	192	187
Construction [Member] | One-to-four Family Residential Construction [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]
Beginning balance		(9)
Construction [Member] | One-to-four Family Residential Construction [Member] | Prior to Adoption of Asc 326 [Member]
Beginning balance		206
Construction [Member] | Other Construction, Development and Land [Member]
Beginning balance	804
Provision for credit losses	7	(111)
Charge-offs	0	0
Recoveries	0	0
Ending balance	811	489
Construction [Member] | Other Construction, Development and Land [Member] | Prior to Adoption of Asc 326 [Member]
Beginning balance		587
Commercial Portfolio Segment [Member] | Commercial Real Estate Loan [Member]
Beginning balance	2,119
Provision for credit losses	634	291
Charge-offs	0	0
Recoveries	1	0
Ending balance	2,754	2,190
Commercial Portfolio Segment [Member] | Commercial Real Estate Loan [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]
Beginning balance		(130)
Commercial Portfolio Segment [Member] | Commercial Real Estate Loan [Member] | Prior to Adoption of Asc 326 [Member]
Beginning balance		2,029
Commercial Portfolio Segment [Member] | Commercial Business [Member]
Beginning balance	1,431
Provision for credit losses	(129)	220
Charge-offs	0	(155)
Recoveries	0	5
Ending balance	$ 1,302	1,084
Commercial Portfolio Segment [Member] | Commercial Business [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]
Beginning balance		(142)
Commercial Portfolio Segment [Member] | Commercial Business [Member] | Prior to Adoption of Asc 326 [Member]
Beginning balance		$ 1,156