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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, 2024	Dec. 31, 2023	Sep. 30, 2024
Loans receivable	$ 895,157	$ 1,059,106
Real Estate Portfolio [Member] | One-to-Four Family Residential Real Estate [Member]
Loans receivable	14,829	18,945
Financing Receivable, current year	0	489
Financing Receivable, one year before	484	0
Financing Receivable, two years before	0	0
Financing Receivable, three years before	0	130
Financing Receivable, four years before	34	0
Financing Receivable, prior	11,089	14,356
Financing Receivable, revolving	3,222	3,970
Current period recoveries, current year	0	0
Current period recoveries, one year before	0	0
Current period recoveries, two years before	0	0
Current period recoveries, three years before	0	0
Current period recoveries, four years before	0	0
Current period recoveries, prior	28	45
Current period recoveries, revolving	0	0
Current period recoveries, total	28	45
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)
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	521,957	527,460
Financing Receivable, current year	33,812	43,504
Financing Receivable, one year before	38,444	212,740
Financing Receivable, two years before	204,590	112,667
Financing Receivable, three years before	107,420	57,743
Financing Receivable, four years before	55,129	22,064
Financing Receivable, prior	76,940	70,007
Financing Receivable, revolving	5,622	8,735
Current period recoveries, current year	0	0
Current period recoveries, one year before	0	0
Current period recoveries, two years before	0	0
Current period recoveries, three years before	0	0
Current period recoveries, four years before	0	0
Current period recoveries, prior	18	20
Current period recoveries, revolving	0	0
Current period recoveries, total	18	20
Current period gross charge-offs	0
Current period gross charge-offs	0
Current period gross charge-offs	(5)
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	(5)
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	(5)
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	18
Financing Receivable, Excluding Accrued Interest, Revolving, Recovery (Writeoff), Net	0
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Recovery (Writeoff), Net	13
Real Estate Portfolio [Member] | Nonresidential Real Estate [Member]
Loans receivable	108,153	118,016
Financing Receivable, current year	17,201
Financing Receivable, one year before	14,355
Financing Receivable, two years before	47,580
Financing Receivable, three years before	14,771
Financing Receivable, four years before	7,335
Financing Receivable, prior	5,998
Financing Receivable, revolving	913
Commercial Portfolio Segment [Member]
Loans receivable	248,595	393,321
Financing Receivable, current year	27,360	50,026
Financing Receivable, one year before	32,572	158,485
Financing Receivable, two years before	87,396	63,552
Financing Receivable, three years before	30,804	33,581
Financing Receivable, four years before	10,131	3,028
Financing Receivable, prior	723	1,379
Financing Receivable, revolving	59,609	83,270
Current period recoveries, current year	0	0
Current period recoveries, one year before	0	0
Current period recoveries, two years before	1	37
Current period recoveries, three years before	5	40
Current period recoveries, four years before	7	0
Current period recoveries, prior	1	0
Current period recoveries, revolving	0	0
Current period recoveries, total	14	77
Current period gross charge-offs	0	(20)
Current period gross charge-offs	(332)	(1,850)
Current period gross charge-offs	(4,998)	0
Current period gross charge-offs	(44)	(306)
Current period gross charge-offs	(493)	0
Current period gross charge-offs	0	0
Current period gross charge-offs	0	0
Current period gross charge-offs	(5,867)	(2,176)
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year, Recovery (Writeoff), Net	0	(20)
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year, Recovery (Writeoff), Net	(332)	(1,850)
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year, Recovery (Writeoff), Net	(4,997)	37
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year, Recovery (Writeoff), Net	(39)	(266)
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year, Recovery (Writeoff), Net	(486)	0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year, Recovery (Writeoff), Net	1	0
Financing Receivable, Excluding Accrued Interest, Revolving, Recovery (Writeoff), Net	0	0
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Recovery (Writeoff), Net	(5,853)	(2,099)
Consumer Portfolio Segment [Member]
Loans receivable	1,623	1,364
Financing Receivable, current year	790	336
Financing Receivable, one year before	169	8
Financing Receivable, two years before	3	140
Financing Receivable, three years before	20	80
Financing Receivable, four years before	49	247
Financing Receivable, prior	0	0
Financing Receivable, revolving	592	553
Current period recoveries, current year	0	0
Current period recoveries, one year before	0	0
Current period recoveries, two years before	0	0
Current period recoveries, three years before	0	0
Current period recoveries, four years before	0	0
Current period recoveries, prior	0	0
Current period recoveries, revolving	1	1
Current period recoveries, total	1	1
Current period gross charge-offs	0	0
Current period gross charge-offs	0	0
Current period gross charge-offs	0	0
Current period gross charge-offs	0	0
Current period gross charge-offs	0	0
Current period gross charge-offs	0	0
Current period gross charge-offs	(44)	(52)
Current period gross charge-offs	(44)	(52)
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year, Recovery (Writeoff), Net	0	0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year, Recovery (Writeoff), Net	0	0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year, Recovery (Writeoff), Net	0	0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year, Recovery (Writeoff), Net	0	0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year, Recovery (Writeoff), Net	0	0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year, Recovery (Writeoff), Net	0	0
Financing Receivable, Excluding Accrued Interest, Revolving, Recovery (Writeoff), Net	(43)	(51)
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Recovery (Writeoff), Net	(43)	(51)
Pass [Member]
Loans receivable	866,318	1,021,519
Pass [Member] | Real Estate Portfolio [Member] | One-to-Four Family Residential Real Estate [Member]
Loans receivable	14,485	18,636
Financing Receivable, current year	0	489
Financing Receivable, one year before	484	0
Financing Receivable, two years before	0	0
Financing Receivable, three years before	0	130
Financing Receivable, four years before	34	0
Financing Receivable, prior	10,897	14,213
Financing Receivable, revolving	3,070	3,804
Pass [Member] | Real Estate Portfolio [Member] | Multi-family Mortgage [Member]
Loans receivable	515,478	526,127
Financing Receivable, current year	33,812	43,386
Financing Receivable, one year before	38,228	211,525
Financing Receivable, two years before	199,495	112,667
Financing Receivable, three years before	107,420	57,743
Financing Receivable, four years before	55,129	22,064
Financing Receivable, prior	75,772	70,007
Financing Receivable, revolving	5,622	8,735
Pass [Member] | Real Estate Portfolio [Member] | Nonresidential Real Estate [Member]
Loans receivable	106,891	118,016
Financing Receivable, current year	16,760	17,618
Financing Receivable, one year before	14,355	53,256
Financing Receivable, two years before	46,759	21,939
Financing Receivable, three years before	14,771	7,787
Financing Receivable, four years before	7,335	9,024
Financing Receivable, prior	5,998	8,288
Financing Receivable, revolving	913	104
Pass [Member] | Commercial Portfolio Segment [Member]
Loans receivable	227,851	357,384
Financing Receivable, current year	27,360	50,015
Financing Receivable, one year before	32,517	137,615
Financing Receivable, two years before	72,546	63,028
Financing Receivable, three years before	30,764	33,004
Financing Receivable, four years before	9,973	3,028
Financing Receivable, prior	723	1,379
Financing Receivable, revolving	53,968	69,315
Pass [Member] | Consumer Portfolio Segment [Member]
Loans receivable	1,613	1,356
Financing Receivable, current year	788	336
Financing Receivable, one year before	169	8
Financing Receivable, two years before	3	140
Financing Receivable, three years before	20	80
Financing Receivable, four years before	49	247
Financing Receivable, prior	0	0
Financing Receivable, revolving	584	545
Special Mention [Member]
Loans receivable	7,446	11,925
Special Mention [Member] | Real Estate Portfolio [Member] | One-to-Four Family Residential Real Estate [Member]
Loans receivable	0	0
Special Mention [Member] | Real Estate Portfolio [Member] | Multi-family Mortgage [Member]
Loans receivable	3,858	1,333
Financing Receivable, current year	0	118
Financing Receivable, one year before	0	1,215
Financing Receivable, two years before	3,858	0
Financing Receivable, three years before	0	0
Financing Receivable, four years before	0	0
Financing Receivable, prior	0	0
Financing Receivable, revolving	0	0
Special Mention [Member] | Real Estate Portfolio [Member] | Nonresidential Real Estate [Member]
Loans receivable	428	0
Financing Receivable, current year	0
Financing Receivable, one year before	0
Financing Receivable, two years before	428
Financing Receivable, three years before	0
Financing Receivable, four years before	0
Financing Receivable, prior	0
Financing Receivable, revolving	0
Special Mention [Member] | Commercial Portfolio Segment [Member]
Loans receivable	3,156	10,587
Financing Receivable, current year	0	0
Financing Receivable, one year before	0	0
Financing Receivable, two years before	0	0
Financing Receivable, three years before	0	0
Financing Receivable, four years before	0	0
Financing Receivable, prior	0	0
Financing Receivable, revolving	3,156	10,587
Special Mention [Member] | Consumer Portfolio Segment [Member]
Loans receivable	4	5	$ 4
Financing Receivable, current year		0	0
Financing Receivable, one year before		0	0
Financing Receivable, two years before		0	0
Financing Receivable, three years before		0	0
Financing Receivable, four years before		0	0
Financing Receivable, prior		0	0
Financing Receivable, revolving		5	$ 4
Substandard [Member]
Loans receivable	4,459	4,331
Substandard [Member] | Real Estate Portfolio [Member] | One-to-Four Family Residential Real Estate [Member]
Loans receivable	218	272
Financing Receivable, current year	0	0
Financing Receivable, one year before	0	0
Financing Receivable, two years before	0	0
Financing Receivable, three years before	0	0
Financing Receivable, four years before	0	0
Financing Receivable, prior	81	127
Financing Receivable, revolving	137	145
Substandard [Member] | Real Estate Portfolio [Member] | Multi-family Mortgage [Member]
Loans receivable	1,168	0
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	1,168
Financing Receivable, revolving	0
Substandard [Member] | Real Estate Portfolio [Member] | Nonresidential Real Estate [Member]
Loans receivable	441	0
Financing Receivable, current year	441
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	0
Substandard [Member] | Commercial Portfolio Segment [Member]
Loans receivable	2,628	4,056
Financing Receivable, current year	0	0
Financing Receivable, one year before	0	666
Financing Receivable, two years before	103	0
Financing Receivable, three years before	40	22
Financing Receivable, four years before	0	0
Financing Receivable, prior	0	0
Financing Receivable, revolving	2,485	3,368
Substandard [Member] | Consumer Portfolio Segment [Member]
Loans receivable	4	3
Financing Receivable, current year	0	0
Financing Receivable, one year before	0	0
Financing Receivable, two years before	0	0
Financing Receivable, three years before	0	0
Financing Receivable, four years before	0	0
Financing Receivable, prior	0	0
Financing Receivable, revolving	4	3
Substandard Nonaccrual [Member]
Loans receivable	16,934	21,331
Substandard Nonaccrual [Member] | Real Estate Portfolio [Member] | One-to-Four Family Residential Real Estate [Member]
Loans receivable	126	37
Financing Receivable, current year	0	0
Financing Receivable, one year before	0	0
Financing Receivable, two years before	0	0
Financing Receivable, three years before	0	0
Financing Receivable, four years before	0	0
Financing Receivable, prior	111	16
Financing Receivable, revolving	15	21
Substandard Nonaccrual [Member] | Real Estate Portfolio [Member] | Multi-family Mortgage [Member]
Loans receivable	1,453	0
Financing Receivable, current year	0
Financing Receivable, one year before	216
Financing Receivable, two years before	1,237
Financing Receivable, three years before	0
Financing Receivable, four years before	0
Financing Receivable, prior	0
Financing Receivable, revolving	0
Substandard Nonaccrual [Member] | Real Estate Portfolio [Member] | Nonresidential Real Estate [Member]
Loans receivable	393	0
Financing Receivable, current year	0
Financing Receivable, one year before	0
Financing Receivable, two years before	393
Financing Receivable, three years before	0
Financing Receivable, four years before	0
Financing Receivable, prior	0
Financing Receivable, revolving	0
Substandard Nonaccrual [Member] | Commercial Portfolio Segment [Member]
Loans receivable	14,960	21,294
Financing Receivable, current year	0	11
Financing Receivable, one year before	55	20,204
Financing Receivable, two years before	14,747	524
Financing Receivable, three years before	0	555
Financing Receivable, four years before	158	0
Financing Receivable, prior	0	0
Financing Receivable, revolving	0	0
Substandard Nonaccrual [Member] | Consumer Portfolio Segment [Member]
Loans receivable	2	$ 0
Financing Receivable, current year	2
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	$ 0

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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- Definition

Amount, excluding accrued interest, of recovery (writeoff) 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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- Definition

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

+ References

No definition available.

+ Details

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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.

+ Details

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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.

+ Details

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- Definition

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.

+ Details

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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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X

- 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/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 2: 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 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/1943274/2147478546/942-210-S99-1

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X

- 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
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