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Note 4 - Loans and Allowance for Credit Losses - Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Jan. 01, 2023
Beginning balance				$ 6,772				$ 6,625	$ 6,772	$ 6,083	$ 6,625
Provision for (recapture of) credit losses	$ 308	$ 290	$ 350	193	$ (400)	$ 0	$ 0	75	1,141	950	(325)
Charge-offs									(681)	(505)	(454)
Recoveries									212	244	237
Ending balance	8,005				6,083				8,005	6,772	6,083
Individually evaluated for impairment										155
Collectively evaluated for impairment										6,617
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest	8,005				6,083				8,005	6,772	6,083
Individually evaluated for impairment										1,935
Collectively evaluated for impairment										564,327
Recorded investment in loans	622,414								622,414	566,548
Financial Asset Acquired with Credit Deterioration [Member]
Beginning balance				0					0
Ending balance	0								0	0
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest	0								0	0
Recorded investment in loans										286
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]
Beginning balance				561					561
Ending balance										561
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest										561
Recorded investment in loans												$ 0
Prior to Adoption of Asc 326 [Member]
Beginning balance				6,772					6,772
Ending balance										6,772
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest										6,772
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]
Beginning balance				1,383				1,239	1,383	1,174	1,239
Provision for (recapture of) credit losses										247	(35)
Charge-offs										(48)	(35)
Recoveries										10	5
Ending balance					1,174					1,383	1,174
Individually evaluated for impairment										0
Collectively evaluated for impairment										1,383
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest					1,174					1,383	1,174
Individually evaluated for impairment										854
Collectively evaluated for impairment										154,798
Recorded investment in loans										155,938
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member] | Financial Asset Acquired with Credit Deterioration [Member]
Beginning balance				0					0
Ending balance										0
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest										0
Recorded investment in loans										286
Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member]
Beginning balance				265				209	265	234	209
Provision for (recapture of) credit losses										31	34
Charge-offs										0	(9)
Recoveries										0	0
Ending balance					234					265	234
Individually evaluated for impairment										0
Collectively evaluated for impairment										265
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest					234					265	234
Individually evaluated for impairment										51
Collectively evaluated for impairment										21,946
Recorded investment in loans										21,997
Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member] | Financial Asset Acquired with Credit Deterioration [Member]
Beginning balance				0					0
Ending balance										0
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest										0
Recorded investment in loans										0
Real Estate Mortgage Portfolio Segment [Member] | Construction Loans [Member]
Beginning balance				526				292	526	403	292
Provision for (recapture of) credit losses										123	111
Charge-offs										0	0
Recoveries										0	0
Ending balance					403					526	403
Individually evaluated for impairment										0
Collectively evaluated for impairment										526
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest					403					526	403
Individually evaluated for impairment										0
Collectively evaluated for impairment										42,364
Recorded investment in loans										42,364
Real Estate Mortgage Portfolio Segment [Member] | Construction Loans [Member] | Financial Asset Acquired with Credit Deterioration [Member]
Beginning balance				0					0
Ending balance										0
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest										0
Recorded investment in loans										0
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member]
Beginning balance				2,031				2,358	2,031	1,884	2,358
Provision for (recapture of) credit losses										147	(474)
Charge-offs										0	0
Recoveries										0	0
Ending balance					1,884					2,031	1,884
Individually evaluated for impairment										0
Collectively evaluated for impairment										2,031
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest					1,884					2,031	1,884
Individually evaluated for impairment										463
Collectively evaluated for impairment										161,212
Recorded investment in loans										161,675
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member] | Financial Asset Acquired with Credit Deterioration [Member]
Beginning balance				0					0
Ending balance										0
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest										0
Recorded investment in loans										0
Commercial Portfolio Segment [Member]
Beginning balance				1,046				843	1,046	873	843
Provision for (recapture of) credit losses										173	20
Charge-offs										(9)	0
Recoveries										9	10
Ending balance					873					1,046	873
Individually evaluated for impairment										155
Collectively evaluated for impairment										891
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest					873					1,046	873
Individually evaluated for impairment										195
Collectively evaluated for impairment										60,781
Recorded investment in loans										60,976
Commercial Portfolio Segment [Member] | Financial Asset Acquired with Credit Deterioration [Member]
Beginning balance				0					0
Ending balance										0
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest										0
Recorded investment in loans										0
Commercial Portfolio Segment [Member] | Commercial Real Estate Loan [Member]
Provision for (recapture of) credit losses									220
Charge-offs									0
Recoveries									0
Ending balance	2,119								2,119
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest	2,119								2,119
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)					(130)
Ending balance										(130)
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest										(130)
Commercial Portfolio Segment [Member] | Commercial Real Estate Loan [Member] | Prior to Adoption of Asc 326 [Member]
Beginning balance				2,029					2,029
Ending balance										2,029
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest										2,029
Commercial Portfolio Segment [Member] | Commercial Business [Member]
Provision for (recapture of) credit losses									613
Charge-offs									(205)
Recoveries									9
Ending balance	1,431								1,431
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest	1,431								1,431
Recorded investment in loans	68,212								68,212
Commercial Portfolio Segment [Member] | Commercial Business [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]
Beginning balance				(142)					(142)
Ending balance										(142)
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest										(142)
Recorded investment in loans												7,248
Commercial Portfolio Segment [Member] | Commercial Business [Member] | Prior to Adoption of Asc 326 [Member]
Beginning balance				1,156					1,156
Ending balance										1,156
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest										1,156
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]
Beginning balance				530				617	530	527	617
Provision for (recapture of) credit losses									(86)	1	(88)
Charge-offs									(15)	0	(10)
Recoveries									2	2	8
Ending balance	406				527				406	530	527
Individually evaluated for impairment										0
Collectively evaluated for impairment										530
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest	406				527				406	530	527
Individually evaluated for impairment										372
Collectively evaluated for impairment										58,961
Recorded investment in loans	63,301								63,301	59,333
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member] | Financial Asset Acquired with Credit Deterioration [Member]
Beginning balance				0					0
Ending balance										0
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest										0
Recorded investment in loans										0
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)					(26)
Ending balance										(26)
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest										(26)
Recorded investment in loans												92
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member] | Prior to Adoption of Asc 326 [Member]
Beginning balance				531					531
Ending balance										531
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest										531
Consumer Portfolio Segment [Member] | All Other Consumer Excluding Home Equity and Second Mortgage [Member]
Beginning balance				991					991	988
Provision for (recapture of) credit losses									149	228
Charge-offs									(430)	(448)
Recoveries									180	223
Ending balance	1,215				988				1,215	991	988
Individually evaluated for impairment										0
Collectively evaluated for impairment										991
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest	1,215				988				1,215	991	988
Individually evaluated for impairment										0
Collectively evaluated for impairment										64,265
Recorded investment in loans										64,265
Consumer Portfolio Segment [Member] | All Other Consumer Excluding Home Equity and Second Mortgage [Member] | Financial Asset Acquired with Credit Deterioration [Member]
Beginning balance				0					0
Ending balance										0
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest										0
Recorded investment in loans										0
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					435
Ending balance										435
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest										435
Recorded investment in loans												(7,262)
Consumer Portfolio Segment [Member] | All Other Consumer Excluding Home Equity and Second Mortgage [Member] | Prior to Adoption of Asc 326 [Member]
Beginning balance				881					881
Ending balance										881
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest										881
Consumer Portfolio Segment [Member] | Other Consumer Loan [Member]
Beginning balance								$ 1,067		988	1,067
Provision for (recapture of) credit losses											107
Charge-offs									(430)		(400)
Recoveries											214
Ending balance					988						988
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest					$ 988						$ 988
Recorded investment in loans	56,373								56,373	64,265
Residential Portfolio Segment [Member] | Residential Loan [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]
Recorded investment in loans												(155,445)
Residential Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]
Charge-offs									(15)
Residential Portfolio Segment [Member] | One-to-four Family Loan [Member]
Provision for (recapture of) credit losses									41
Charge-offs									(31)
Recoveries									21
Ending balance	1,490								1,490
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest	1,490								1,490
Recorded investment in loans	133,601								133,601
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					423
Ending balance										423
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest										423
Recorded investment in loans												116,392
Residential Portfolio Segment [Member] | One-to-four Family Loan [Member] | Prior to Adoption of Asc 326 [Member]
Beginning balance				1,036					1,036
Ending balance										1,036
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest										1,036
Residential Portfolio Segment [Member] | Multifamily [Member]
Provision for (recapture of) credit losses									(11)
Charge-offs									0
Recoveries									0
Ending balance	332								332
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest	332								332
Recorded investment in loans	39,946								39,946
Residential Portfolio Segment [Member] | Multifamily [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]
Beginning balance				(3)					(3)
Ending balance										(3)
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest										(3)
Recorded investment in loans												38,962
Residential Portfolio Segment [Member] | Multifamily [Member] | Prior to Adoption of Asc 326 [Member]
Beginning balance				346					346
Ending balance										346
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest										346
Construction [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]
Beginning balance				13					13
Ending balance										13
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest										13
Construction [Member] | Prior to Adoption of Asc 326 [Member]
Beginning balance				587					587
Ending balance										587
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest										587
Construction [Member] | Land Loan [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]
Recorded investment in loans												(21,874)
Construction [Member] | Construction Loans [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]
Recorded investment in loans												(42,259)
Construction [Member] | One-to-four Family Residential Construction [Member]
Provision for (recapture of) credit losses									11
Charge-offs									0
Recoveries									0
Ending balance	208								208
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest	208								208
Recorded investment in loans	15,667								15,667
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)					(9)
Ending balance										(9)
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest										(9)
Recorded investment in loans												16,575
Construction [Member] | One-to-four Family Residential Construction [Member] | Prior to Adoption of Asc 326 [Member]
Beginning balance				$ 206					206
Ending balance										206
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest										$ 206
Construction [Member] | Other Construction, Development and Land [Member]
Provision for (recapture of) credit losses									204
Charge-offs									0
Recoveries									0
Ending balance	804								804
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest	804								804
Recorded investment in loans	$ 76,669								$ 76,669
Construction [Member] | Other Construction, Development and Land [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]
Recorded investment in loans												$ 47,633

X

- Definition

Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.

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