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Note 1 - Summary of Significant Accounting Policies - Summary of Adoption of New Accounting Standards (Details) - USD ($)	Mar. 31, 2023	Jan. 01, 2023	Dec. 31, 2022	Mar. 31, 2022	Dec. 31, 2021
Allowance for loan losses	$ 10,032,000		$ 8,129,000	$ 6,786,000	$ 6,715,000
Commercial Portfolio Segment [Member]
Allowance for loan losses	3,576,000		2,548,000	2,078,000	1,652,000
Consumer Portfolio Segment [Member]
Allowance for loan losses	41,000		49,000	46,000	44,000
One-to-Four Family Residential Real Estate [Member] | Real Estate Portfolio [Member]
Allowance for loan losses	354,000		281,000	315,000	331,000
Multi-family Mortgage [Member] | Real Estate Portfolio [Member]
Allowance for loan losses	4,714,000		4,017,000	3,390,000	3,377,000
Nonresidential Real Estate [Member] | Real Estate Portfolio [Member]
Allowance for loan losses	$ 1,347,000		1,234,000	$ 957,000	$ 1,311,000
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	2,548,000
Accounting Standards Update 2016-13 [Member] | Consumer Portfolio Segment [Member]
Allowance for loan losses		49,000	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	281,000
Accounting Standards Update 2016-13 [Member] | Multi-family Mortgage [Member] | Real Estate Portfolio [Member]
Allowance for loan losses		4,017,000	4,017,000
Accounting Standards Update 2016-13 [Member] | Nonresidential Real Estate [Member] | Real Estate Portfolio [Member]
Allowance for loan losses		1,234,000	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	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	380,000
Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Multi-family Mortgage [Member] | Real Estate Portfolio [Member]
Allowance for loan losses		4,647,000	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	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	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	99,000
Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Multi-family Mortgage [Member] | Real Estate Portfolio [Member]
Allowance for loan losses		630,000	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	$ 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://www.xbrl.org/2003/role/disclosureRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
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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/2009/role/commonPracticeRef
-Topic 942
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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
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- Definition

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+ References

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