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Note 1 - Summary of Significant Accounting Policies - Summary of Adoption of New Accounting Standards (Details) - USD ($)	Dec. 31, 2024	Dec. 31, 2023	Jan. 01, 2023	Dec. 31, 2022
Allowance for loan losses	$ 7,571,000	$ 8,345,000
Commercial Portfolio Segment [Member]
Allowance for loan losses	1,146,000	2,303,000
Consumer Portfolio Segment [Member]
Allowance for loan losses	48,000	32,000		$ 49,000
One-to-Four Family Residential Real Estate [Member] | Real Estate Portfolio [Member]
Allowance for loan losses	271,000	295,000
Nonresidential Real Estate [Member] | Real Estate Portfolio [Member]
Allowance for loan losses	$ 1,342,000	$ 1,166,000
Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
Unfunded commitment reserve			$ 417,000
Cumulative Effect, Period of Adoption, Adjustment [Member]
Unfunded commitment reserve			417,000
Accounting Standards Update 2016-13 [Member]
Allowance for loan losses			8,129,000	8,129,000
Unfunded commitment reserve			0
Accounting Standards Update 2016-13 [Member] | Commercial Portfolio Segment [Member]
Allowance for loan losses			2,548,000
Accounting Standards Update 2016-13 [Member] | Consumer Portfolio Segment [Member]
Allowance for loan losses			49,000
Accounting Standards Update 2016-13 [Member] | One-to-Four Family Residential Real Estate [Member] | Real Estate Portfolio [Member]
Allowance for loan losses			281,000
Accounting Standards Update 2016-13 [Member] | One-to-Four Family Residential Real Estate [Member] | Multi-family Mortgage [Member]
Allowance for loan losses			4,017,000
Accounting Standards Update 2016-13 [Member] | Nonresidential Real Estate [Member] | Real Estate Portfolio [Member]
Allowance for loan losses			1,234,000
Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
Allowance for loan losses			10,036,000	10,036,000
Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Commercial Portfolio Segment [Member]
Allowance for loan losses			3,670,000
Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Consumer Portfolio Segment [Member]
Allowance for loan losses			39,000	39,000
Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | One-to-Four Family Residential Real Estate [Member] | Real Estate Portfolio [Member]
Allowance for loan losses			380,000
Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | One-to-Four Family Residential Real Estate [Member] | Multi-family Mortgage [Member]
Allowance for loan losses			4,647,000
Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Nonresidential Real Estate [Member] | Real Estate Portfolio [Member]
Allowance for loan losses			1,300,000
Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Allowance for loan losses			1,907,000	1,907,000
Unfunded commitment reserve			417,000
Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Commercial Portfolio Segment [Member]
Allowance for loan losses			1,122,000
Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Consumer Portfolio Segment [Member]
Allowance for loan losses			(10,000)	$ (10,000)
Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | One-to-Four Family Residential Real Estate [Member] | Real Estate Portfolio [Member]
Allowance for loan losses			99,000
Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | One-to-Four Family Residential Real Estate [Member] | Multi-family Mortgage [Member]
Allowance for loan losses			630,000
Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Nonresidential Real Estate [Member] | Real Estate Portfolio [Member]
Allowance for loan losses			$ 66,000

X

- Definition

Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Topic 310
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
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Reference 6: http://www.xbrl.org/2003/role/disclosureRef
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-Section 45
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Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 942
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-Name Accounting Standards Codification
-Section S99
-Paragraph 1
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Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
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Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
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-Section 50
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- Definition

Amount of expected credit loss for credit exposure on off-balance-sheet commitment, including but not limited to, loan commitment, standby letter of credit, financial guarantee not accounted for as insurance. Excludes off-balance sheet credit exposure accounted for as insurance and instrument accounted for under derivatives and hedging.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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