Note 4 - Loans and Allowance for Credit Losses - Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Beginning balance,	$ 8,230	$ 7,323	$ 8,005
Provision for credit losses	360	350	640	$ 543
Charge-offs	(85)	(235)	(185)	(510)
Recoveries	55	77	100	149
Ending balance	8,560	7,515	8,560	7,515
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,	1,338	1,414	1,490
Provision for credit losses	(46)	69	(198)	26
Charge-offs	(3)	(29)	(4)	(31)
Recoveries	13	15	14	15
Ending balance	1,302	1,469	1,302	1,469
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]
Beginning balance,	444	366	406
Provision for credit losses	114	6	149	(133)
Charge-offs	0	(9)	0	(9)
Recoveries	1	0	4	0
Ending balance	559	363	559	363
Residential 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)
Residential Portfolio Segment [Member] | Home Equity and Second Mortgage [Member] | Prior to Adoption of Asc 326 [Member]
Beginning balance,				531
Residential Portfolio Segment [Member] | Multifamily [Member]
Beginning balance,	423	381	332
Provision for credit losses	(81)	233	10	271
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Ending balance	342	614	342	614
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
Construction [Member] | One-to-four Family Residential Construction [Member]
Beginning balance,	192	187	208
Provision for credit losses	(13)	(16)	(29)	(26)
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Ending balance	179	171	179	171
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,	811	489	804
Provision for credit losses	(8)	(29)	(1)	(140)
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Ending balance	803	460	803	460
Construction [Member] | Other Construction, Development and Land [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]
Beginning balance,				13
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,	2,754	2,190	2,119
Provision for credit losses	(407)	(174)	227	117
Charge-offs	0	0	0	0
Recoveries	0	0	1	0
Ending balance	2,347	2,016	2,347	2,016
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,	1,302	1,084	1,431
Provision for credit losses	617	510	488	730
Charge-offs	0	(33)	0	(188)
Recoveries	1	3	1	8
Ending balance		1,564		1,564
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
Consumer Portfolio Segment [Member] | Commercial Business [Member]
Ending balance	1,920	1,564	1,920	1,564
Consumer Portfolio Segment [Member] | Other Consumer Loan [Member]
Beginning balance,	966	1,212	1,215
Provision for credit losses	184	(249)	(6)	(302)
Charge-offs			(181)	(282)
Recoveries	40	59	80	126
Ending balance	1,108	858	1,108	858
Consumer Portfolio Segment [Member] | Other Consumer Loan [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]
Beginning balance,				435
Consumer Portfolio Segment [Member] | Other Consumer Loan [Member] | Prior to Adoption of Asc 326 [Member]
Beginning balance,				$ 881
Commercial Real Estate Loan [Member] | Other Consumer Loan [Member]
Charge-offs	$ (82)	$ (164)	$ (181)