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Note 4 - Loans Receivable - Risk Categories of Loans By Class of Loans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Loans receivable	$ 1,059,106	$ 1,234,872
Current period gross charge-offs	0
Current period gross charge-offs	0
Current period gross charge-offs	0
Current period gross charge-offs	0
Current period gross charge-offs	0
Current period gross charge-offs	0
Current period gross charge-offs	(52)
Current period gross charge-offs	(52)
Real Estate Portfolio [Member] | One-to-Four Family Residential Real Estate [Member]
Loans receivable	18,945	23,133
Financing Receivable, current year	489
Financing Receivable, one year before	0
Financing Receivable, two years before	0
Financing Receivable, three years before	130
Financing Receivable, four years before	0
Financing Receivable, prior	14,356
Financing Receivable, revolving	3,970
Current period recoveries, current year	0
Current period recoveries, one year before	0
Current period recoveries, two years before	0
Current period recoveries, three years before	0
Current period recoveries, four years before	0
Current period recoveries, prior	45
Current period recoveries, revolving	0
Current period recoveries, total	45
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year, Recovery (Writeoff), Net	0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year, Recovery (Writeoff), Net	0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year, Recovery (Writeoff), Net	0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year, Recovery (Writeoff), Net	0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year, Recovery (Writeoff), Net	0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year, Recovery (Writeoff), Net	44
Financing Receivable, Excluding Accrued Interest, Revolving, Recovery (Writeoff), Net	0
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Recovery (Writeoff), Net	44
Real Estate Portfolio [Member] | Multi-family Mortgage [Member]
Loans receivable	527,460	537,394
Financing Receivable, current year	43,504
Financing Receivable, one year before	212,740
Financing Receivable, two years before	112,667
Financing Receivable, three years before	57,743
Financing Receivable, four years before	22,064
Financing Receivable, prior	70,007
Financing Receivable, revolving	8,735
Current period recoveries, current year	0
Current period recoveries, one year before	0
Current period recoveries, two years before	0
Current period recoveries, three years before	0
Current period recoveries, four years before	0
Current period recoveries, prior	20
Current period recoveries, revolving	0
Current period recoveries, total	20
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year, Recovery (Writeoff), Net	0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year, Recovery (Writeoff), Net	0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year, Recovery (Writeoff), Net	0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year, Recovery (Writeoff), Net	0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year, Recovery (Writeoff), Net	0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year, Recovery (Writeoff), Net	20
Financing Receivable, Excluding Accrued Interest, Revolving, Recovery (Writeoff), Net	0
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Recovery (Writeoff), Net	20
Real Estate Portfolio [Member] | Nonresidential Real Estate [Member]
Loans receivable	118,016	119,705
Financing Receivable, current year	17,618
Financing Receivable, one year before	53,256
Financing Receivable, two years before	21,939
Financing Receivable, three years before	7,787
Financing Receivable, four years before	9,024
Financing Receivable, prior	8,288
Financing Receivable, revolving	104
Commercial Portfolio Segment [Member]
Loans receivable	393,321	553,056
Financing Receivable, current year	50,026
Financing Receivable, one year before	158,485
Financing Receivable, two years before	63,552
Financing Receivable, three years before	33,581
Financing Receivable, four years before	3,028
Financing Receivable, prior	1,379
Financing Receivable, revolving	83,270
Current period gross charge-offs	0
Current period gross charge-offs	0
Current period gross charge-offs	0
Current period gross charge-offs	0
Current period gross charge-offs	0
Current period gross charge-offs	(1)
Current period gross charge-offs	0
Current period gross charge-offs	(1)
Current period recoveries, current year	0
Current period recoveries, one year before	0
Current period recoveries, two years before	37
Current period recoveries, three years before	40
Current period recoveries, four years before	0
Current period recoveries, prior	0
Current period recoveries, revolving	0
Current period recoveries, total	77
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year, Recovery (Writeoff), Net	(20)
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year, Recovery (Writeoff), Net	(1,850)
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year, Recovery (Writeoff), Net	37
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year, Recovery (Writeoff), Net	(266)
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year, Recovery (Writeoff), Net	0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year, Recovery (Writeoff), Net	0
Financing Receivable, Excluding Accrued Interest, Revolving, Recovery (Writeoff), Net	0
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Recovery (Writeoff), Net	(2,099)
Consumer Portfolio Segment [Member]
Loans receivable	1,364	1,584
Financing Receivable, current year	336
Financing Receivable, one year before	8
Financing Receivable, two years before	140
Financing Receivable, three years before	80
Financing Receivable, four years before	247
Financing Receivable, prior	0
Financing Receivable, revolving	553
Current period gross charge-offs	(20)
Current period gross charge-offs	(1,850)
Current period gross charge-offs	0
Current period gross charge-offs	(306)
Current period gross charge-offs	0
Current period gross charge-offs	0
Current period gross charge-offs	0
Current period gross charge-offs	(2,176)
Current period recoveries, current year	0
Current period recoveries, one year before	0
Current period recoveries, two years before	0
Current period recoveries, three years before	0
Current period recoveries, four years before	0
Current period recoveries, prior	0
Current period recoveries, revolving	1
Current period recoveries, total	1
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year, Recovery (Writeoff), Net	0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year, Recovery (Writeoff), Net	0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year, Recovery (Writeoff), Net	0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year, Recovery (Writeoff), Net	0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year, Recovery (Writeoff), Net	0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year, Recovery (Writeoff), Net	0
Financing Receivable, Excluding Accrued Interest, Revolving, Recovery (Writeoff), Net	(51)
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Recovery (Writeoff), Net	(51)
Pass [Member]
Loans receivable	993,157	1,198,984
Pass [Member] | Real Estate Portfolio [Member] | One-to-Four Family Residential Real Estate [Member]
Loans receivable	18,492	22,648
Financing Receivable, current year	489
Financing Receivable, one year before	0
Financing Receivable, two years before	0
Financing Receivable, three years before	130
Financing Receivable, four years before	0
Financing Receivable, prior	14,069
Financing Receivable, revolving	3,804
Pass [Member] | Real Estate Portfolio [Member] | Multi-family Mortgage [Member]
Loans receivable	518,538	534,253
Financing Receivable, current year	43,386
Financing Receivable, one year before	210,878
Financing Receivable, two years before	108,563
Financing Receivable, three years before	57,480
Financing Receivable, four years before	22,064
Financing Receivable, prior	67,432
Financing Receivable, revolving	8,735
Pass [Member] | Real Estate Portfolio [Member] | Nonresidential Real Estate [Member]
Loans receivable	114,155	116,635
Financing Receivable, current year	17,618
Financing Receivable, one year before	50,898
Financing Receivable, two years before	20,436
Financing Receivable, three years before	7,787
Financing Receivable, four years before	9,024
Financing Receivable, prior	8,288
Financing Receivable, revolving	104
Pass [Member] | Commercial Portfolio Segment [Member]
Loans receivable	340,623	523,889
Financing Receivable, current year	43,972
Financing Receivable, one year before	130,444
Financing Receivable, two years before	62,280
Financing Receivable, three years before	32,633
Financing Receivable, four years before	3,028
Financing Receivable, prior	1,379
Financing Receivable, revolving	66,887
Pass [Member] | Consumer Portfolio Segment [Member]
Loans receivable	1,349	1,559
Financing Receivable, current year	336
Financing Receivable, one year before	8
Financing Receivable, two years before	140
Financing Receivable, three years before	80
Financing Receivable, four years before	247
Financing Receivable, prior	0
Financing Receivable, revolving	538
Watch [Member]
Loans receivable	28,362	28,584
Watch [Member] | Real Estate Portfolio [Member] | One-to-Four Family Residential Real Estate [Member]
Loans receivable	144	62
Financing Receivable, current year	0
Financing Receivable, one year before	0
Financing Receivable, two years before	0
Financing Receivable, three years before	0
Financing Receivable, four years before	0
Financing Receivable, prior	144
Financing Receivable, revolving	0
Watch [Member] | Real Estate Portfolio [Member] | Multi-family Mortgage [Member]
Loans receivable	7,589	3,141
Financing Receivable, current year	0
Financing Receivable, one year before	647
Financing Receivable, two years before	4,104
Financing Receivable, three years before	263
Financing Receivable, four years before	0
Financing Receivable, prior	2,575
Financing Receivable, revolving	0
Watch [Member] | Real Estate Portfolio [Member] | Nonresidential Real Estate [Member]
Loans receivable	3,861	3,070
Financing Receivable, current year	0
Financing Receivable, one year before	2,358
Financing Receivable, two years before	1,503
Financing Receivable, three years before	0
Financing Receivable, four years before	0
Financing Receivable, prior	0
Financing Receivable, revolving	0
Watch [Member] | Commercial Portfolio Segment [Member]
Loans receivable	16,761	22,299
Financing Receivable, current year	6,043
Financing Receivable, one year before	7,171
Financing Receivable, two years before	748
Financing Receivable, three years before	371
Financing Receivable, four years before	0
Financing Receivable, prior	0
Financing Receivable, revolving	2,428
Watch [Member] | Consumer Portfolio Segment [Member]
Loans receivable	7	12
Financing Receivable, current year	0
Financing Receivable, one year before	0
Financing Receivable, two years before	0
Financing Receivable, three years before	0
Financing Receivable, four years before	0
Financing Receivable, prior	0
Financing Receivable, revolving	7
Special Mention [Member]
Loans receivable	11,925	1,525
Special Mention [Member] | Real Estate Portfolio [Member] | One-to-Four Family Residential Real Estate [Member]
Loans receivable	0	4
Special Mention [Member] | Real Estate Portfolio [Member] | Multi-family Mortgage [Member]
Loans receivable	1,333	0
Special Mention [Member] | Real Estate Portfolio [Member] | Nonresidential Real Estate [Member]
Loans receivable	0	0
Special Mention [Member] | Commercial Portfolio Segment [Member]
Loans receivable	10,587	1,517
Financing Receivable, current year	0
Financing Receivable, one year before	0
Financing Receivable, two years before	0
Financing Receivable, three years before	0
Financing Receivable, four years before	0
Financing Receivable, prior	0
Financing Receivable, revolving	10,587
Special Mention [Member] | Commercial Portfolio Segment [Member] | Multi-family Mortgage [Member]
Loans receivable	1,333
Financing Receivable, current year	118
Financing Receivable, one year before	1,215
Financing Receivable, two years before	0
Financing Receivable, three years before	0
Financing Receivable, four years before	0
Financing Receivable, prior	0
Financing Receivable, revolving	0
Special Mention [Member] | Consumer Portfolio Segment [Member]
Loans receivable	5	4
Financing Receivable, current year	0
Financing Receivable, one year before	0
Financing Receivable, two years before	0
Financing Receivable, three years before	0
Financing Receivable, four years before	0
Financing Receivable, prior	0
Financing Receivable, revolving	5
Substandard [Member]
Loans receivable	4,331	4,372
Substandard [Member] | Real Estate Portfolio [Member] | One-to-Four Family Residential Real Estate [Member]
Loans receivable	272	327
Financing Receivable, current year	0
Financing Receivable, one year before	0
Financing Receivable, two years before	0
Financing Receivable, three years before	0
Financing Receivable, four years before	0
Financing Receivable, prior	127
Financing Receivable, revolving	145
Substandard [Member] | Real Estate Portfolio [Member] | Multi-family Mortgage [Member]
Loans receivable	0	0
Substandard [Member] | Real Estate Portfolio [Member] | Nonresidential Real Estate [Member]
Loans receivable	0	0
Substandard [Member] | Commercial Portfolio Segment [Member]
Loans receivable	4,056	4,041
Financing Receivable, current year	0
Financing Receivable, one year before	666
Financing Receivable, two years before	0
Financing Receivable, three years before	22
Financing Receivable, four years before	0
Financing Receivable, prior	0
Financing Receivable, revolving	3,368
Substandard [Member] | Consumer Portfolio Segment [Member]
Loans receivable	3	4
Financing Receivable, current year	0
Financing Receivable, one year before	0
Financing Receivable, two years before	0
Financing Receivable, three years before	0
Financing Receivable, four years before	0
Financing Receivable, prior	0
Financing Receivable, revolving	3
Substandard Nonaccrual [Member]
Loans receivable	21,331	1,407
Substandard Nonaccrual [Member] | Real Estate Portfolio [Member] | One-to-Four Family Residential Real Estate [Member]
Loans receivable	37	92
Financing Receivable, current year	0
Financing Receivable, one year before	0
Financing Receivable, two years before	0
Financing Receivable, three years before	0
Financing Receivable, four years before	0
Financing Receivable, prior	16
Financing Receivable, revolving	21
Substandard Nonaccrual [Member] | Real Estate Portfolio [Member] | Multi-family Mortgage [Member]
Loans receivable	0	0
Substandard Nonaccrual [Member] | Real Estate Portfolio [Member] | Nonresidential Real Estate [Member]
Loans receivable	0	0
Substandard Nonaccrual [Member] | Commercial Portfolio Segment [Member]
Loans receivable	21,294	1,310
Financing Receivable, current year	11
Financing Receivable, one year before	20,204
Financing Receivable, two years before	524
Financing Receivable, three years before	555
Financing Receivable, four years before	0
Financing Receivable, prior	0
Financing Receivable, revolving	0
Substandard Nonaccrual [Member] | Consumer Portfolio Segment [Member]
Loans receivable	$ 0	$ 5

X

- Definition

Amount, excluding accrued interest, of decrease in allowance for credit loss on financing receivable from recovery (writeoff). Excludes net investment in lease.

+ References

No definition available.

+ Details

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- Definition

Amount, excluding accrued interest, of recovery of financing receivable originated more than five years before current fiscal year. Excludes net investment in lease.

+ References

No definition available.

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Amount, excluding accrued interest, of recovery (writeoff) of financing receivable originated more than five years before current fiscal year. Excludes net investment in lease.

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No definition available.

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- Definition

Amount, excluding accrued interest, of recovery of financing receivable that can be withdrawn, repaid, and redrawn.

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No definition available.

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- Definition

Amount, excluding accrued interest, of recovery (writeoff) of financing receivable that can be withdrawn, repaid, and redrawn.

+ References

No definition available.

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- Definition

Amount, excluding accrued interest, of recovery of financing receivable originated four years before current fiscal year. Excludes net investment in lease.

+ References

No definition available.

+ Details

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- Definition

Amount, excluding accrued interest, of recovery (writeoff) of financing receivable originated four years before current fiscal year. Excludes net investment in lease.

+ References

No definition available.

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- Definition

Amount, excluding accrued interest, of recovery of financing receivable originated three years before current fiscal year. Excludes net investment in lease.

+ References

No definition available.

+ Details

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- Definition

Amount, excluding accrued interest, of recovery (writeoff) of financing receivable originated three years before current fiscal year. Excludes net investment in lease.

+ References

No definition available.

+ Details

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- Definition

Amount, excluding accrued interest, of recovery of financing receivable originated in current fiscal year. Excludes net investment in lease.

+ References

No definition available.

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- Definition

Amount, excluding accrued interest, of recovery (writeoff) of financing receivable originated in current fiscal year. Excludes net investment in lease.

+ References

No definition available.

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- Definition

Amount, excluding accrued interest, of recovery of financing receivable originated two years before current fiscal year. Excludes net investment in lease.

+ References

No definition available.

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Amount, excluding accrued interest, of recovery (writeoff) of financing receivable originated two years before current fiscal year. Excludes net investment in lease.

+ References

No definition available.

+ Details

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- Definition

Amount, excluding accrued interest, of recovery of financing receivable originated in fiscal year before current fiscal year. Excludes net investment in lease.

+ References

No definition available.

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- Definition

Amount, excluding accrued interest, of recovery (writeoff) of financing receivable originated in fiscal year before current fiscal year. Excludes net investment in lease.

+ References

No definition available.

+ Details

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- Definition

Amortized cost, before allowance for credit loss, fee, and loan in process, of financing receivable. Excludes financing receivable covered under loss sharing agreement and net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-5

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481990/310-10-45-2

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(7))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1

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- Definition

Amount, excluding accrued interest, of increase in allowance for credit loss on financing receivable from recovery. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-13

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X

- Definition

Amount, excluding accrued interest, of decrease in allowance for credit loss on financing receivable from writeoff. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-6

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-13

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X

- Definition

Amount, excluding accrued interest, of writeoff of financing receivable originated more than five years before current fiscal year. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-6

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- Definition

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