Note 3 - Loans and Allowance for Credit Losses - Summary of Loans by Major Category (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Mar. 31, 2026	Dec. 31, 2025	Jun. 30, 2025	Mar. 31, 2025	Dec. 31, 2024
Loans	$ 127,467		$ 129,464
Net deferred loan costs	156		299
Allowance for credit losses on loans	(1,095)	$ (1,095)	(1,128)	$ (1,200)	$ (1,156)	$ (1,201)
Total loans, net	126,528		128,635
First Mortgage Loans [Member]
Loans	127,155		129,196
Consumer Portfolio Segment [Member]
Loans	312		268
Allowance for credit losses on loans	(3)	(3)	(2)	(2)	(2)	(2)
One To Four Family Residential [Member] \| First Mortgage Loans [Member]
Loans	116,514		118,222
Allowance for credit losses on loans	(967)	(956)	(989)	(1,056)	(1,034)	(1,056)
Multifamily [Member] \| First Mortgage Loans [Member]
Loans	3,775		3,240
Allowance for credit losses on loans	(44)	(39)	(39)	(37)	(37)	(37)
Commercial Real Estate [Member] \| First Mortgage Loans [Member]
Loans	3,846		3,813
Allowance for credit losses on loans	(37)	(34)	(37)	(44)	(38)	(41)
Construction Loans [Member] \| First Mortgage Loans [Member]
Loans	3,020		3,921
Allowance for credit losses on loans	$ (44)	$ (63)	$ (61)	$ (61)	$ (45)	$ (65)

Amount of unamortized loan commitment, origination, and other costs (fees) and purchase premium (discount) on financing receivable recognized as adjustment to yield. Excludes financing receivable covered under loss sharing agreement.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 310
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481598/310-20-45-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477657/942-210-S45-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478478/942-210-S50-1

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(7)(3))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1

Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481962/310-10-50-4

Reference 6: http://www.xbrl.org/2003/role/recommendedDisclosureRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-SubTopic 20
-Topic 310
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481569/310-20-50-3

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant