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Note 4 - Loans Receivable - Aging of the Recorded Investment of Loans (Details) - USD ($)	Sep. 30, 2024	Dec. 31, 2023
Loans receivable	$ 931,838,000	$ 1,059,106,000
Loans receivable, nonaccrual	22,331,000	21,331,000
Real Estate Portfolio [Member] | One-to-Four Family Residential Real Estate [Member]
Loans receivable	15,634,000	18,945,000
Loans receivable, nonaccrual	34,000	37,000
Real Estate Portfolio [Member] | Multi-family Mortgage [Member]
Loans receivable	524,340,000	527,460,000
Loans receivable, nonaccrual	1,458
Real Estate Portfolio [Member] | Multi-family Mortgage [Member] | Senior Mortgage Notes [Member]
Loans receivable	484,591,000	485,281,000
Loans receivable, nonaccrual	1,242,000	0
Real Estate Portfolio [Member] | Multi-family Mortgage [Member] | Junior Mortgage Notes [Member]
Loans receivable	39,749,000	42,179,000
Loans receivable, nonaccrual	216,000	0
Real Estate Portfolio [Member] | Nonresidential Real Estate, Owner Occupied [Member]
Loans receivable	17,154,000	20,901,000
Loans receivable, nonaccrual	0	0
Real Estate Portfolio [Member] | Nonresidential Real Estate, Non-owner Occupied [Member]
Loans receivable	92,645,000	97,115,000
Loans receivable, nonaccrual	393,000	0
Commercial Loans and Leases [Member] | Commercial Loans [Member]
Loans receivable	157,661,000	211,981,000
Loans receivable, nonaccrual	1,221,000	2,285,000
Commercial Loans and Leases [Member] | Equipment Finance Leases, Government [Member]
Loans receivable	84,808,000	132,265,000
Loans receivable, nonaccrual	19,225,000	18,956,000
Commercial Loans and Leases [Member] | Equipment Finance Leases, Investment-rated [Member]
Loans receivable	37,749,000	49,075,000
Loans receivable, nonaccrual	0	53,000
Consumer Portfolio Segment [Member]
Loans receivable	1,847,000	1,364,000
Loans receivable, nonaccrual	0	0
Financial Asset, 30 to 59 Days Past Due [Member]
Loans receivable	1,010,000	3,408,000
Financial Asset, 30 to 59 Days Past Due [Member] | Real Estate Portfolio [Member] | One-to-Four Family Residential Real Estate [Member]
Loans receivable	0	12,000
Financial Asset, 30 to 59 Days Past Due [Member] | Real Estate Portfolio [Member] | Multi-family Mortgage [Member] | Senior Mortgage Notes [Member]
Loans receivable	0	0
Financial Asset, 30 to 59 Days Past Due [Member] | Real Estate Portfolio [Member] | Multi-family Mortgage [Member] | Junior Mortgage Notes [Member]
Loans receivable	0	0
Financial Asset, 30 to 59 Days Past Due [Member] | Real Estate Portfolio [Member] | Nonresidential Real Estate, Owner Occupied [Member]
Loans receivable	0	0
Financial Asset, 30 to 59 Days Past Due [Member] | Real Estate Portfolio [Member] | Nonresidential Real Estate, Non-owner Occupied [Member]
Loans receivable	0	0
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial Loans and Leases [Member] | Commercial Loans [Member]
Loans receivable	204,000	234,000
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial Loans and Leases [Member] | Equipment Finance Leases, Government [Member]
Loans receivable	802,000	3,147,000
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial Loans and Leases [Member] | Equipment Finance Leases, Investment-rated [Member]
Loans receivable	0	7,000
Financial Asset, 30 to 59 Days Past Due [Member] | Consumer Portfolio Segment [Member]
Loans receivable	4,000	8,000
Financial Asset, 60 to 89 Days Past Due [Member]
Loans receivable	148,000	5,077,000
Financial Asset, 60 to 89 Days Past Due [Member] | Real Estate Portfolio [Member] | One-to-Four Family Residential Real Estate [Member]
Loans receivable	93,000	18,000
Financial Asset, 60 to 89 Days Past Due [Member] | Real Estate Portfolio [Member] | Multi-family Mortgage [Member] | Senior Mortgage Notes [Member]
Loans receivable	0	0
Financial Asset, 60 to 89 Days Past Due [Member] | Real Estate Portfolio [Member] | Multi-family Mortgage [Member] | Junior Mortgage Notes [Member]
Loans receivable	0	0
Financial Asset, 60 to 89 Days Past Due [Member] | Real Estate Portfolio [Member] | Nonresidential Real Estate, Owner Occupied [Member]
Loans receivable	0	0
Financial Asset, 60 to 89 Days Past Due [Member] | Real Estate Portfolio [Member] | Nonresidential Real Estate, Non-owner Occupied [Member]
Loans receivable	0	0
Financial Asset, 60 to 89 Days Past Due [Member] | Commercial Loans and Leases [Member] | Commercial Loans [Member]
Loans receivable	52,000	26,000
Financial Asset, 60 to 89 Days Past Due [Member] | Commercial Loans and Leases [Member] | Equipment Finance Leases, Government [Member]
Loans receivable	0	5,028,000
Financial Asset, 60 to 89 Days Past Due [Member] | Commercial Loans and Leases [Member] | Equipment Finance Leases, Investment-rated [Member]
Loans receivable	0	0
Financial Asset, 60 to 89 Days Past Due [Member] | Consumer Portfolio Segment [Member]
Loans receivable	3,000	5,000
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans receivable	0	1,007,000
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Real Estate Portfolio [Member] | One-to-Four Family Residential Real Estate [Member]
Loans receivable	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Real Estate Portfolio [Member] | Multi-family Mortgage [Member] | Senior Mortgage Notes [Member]
Loans receivable	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Real Estate Portfolio [Member] | Multi-family Mortgage [Member] | Junior Mortgage Notes [Member]
Loans receivable	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Real Estate Portfolio [Member] | Nonresidential Real Estate, Owner Occupied [Member]
Loans receivable	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Real Estate Portfolio [Member] | Nonresidential Real Estate, Non-owner Occupied [Member]
Loans receivable	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial Loans and Leases [Member] | Commercial Loans [Member]
Loans receivable	0	666,000
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial Loans and Leases [Member] | Equipment Finance Leases, Government [Member]
Loans receivable	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial Loans and Leases [Member] | Equipment Finance Leases, Investment-rated [Member]
Loans receivable	0	341,000
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Consumer Portfolio Segment [Member]
Loans receivable	0	0
Financial Asset, Past Due [Member]
Loans receivable	1,158,000	9,492,000
Financial Asset, Past Due [Member] | Real Estate Portfolio [Member] | One-to-Four Family Residential Real Estate [Member]
Loans receivable	93,000	30,000
Financial Asset, Past Due [Member] | Real Estate Portfolio [Member] | Multi-family Mortgage [Member] | Senior Mortgage Notes [Member]
Loans receivable	0	0
Financial Asset, Past Due [Member] | Real Estate Portfolio [Member] | Multi-family Mortgage [Member] | Junior Mortgage Notes [Member]
Loans receivable	0	0
Financial Asset, Past Due [Member] | Real Estate Portfolio [Member] | Nonresidential Real Estate, Owner Occupied [Member]
Loans receivable	0	0
Financial Asset, Past Due [Member] | Real Estate Portfolio [Member] | Nonresidential Real Estate, Non-owner Occupied [Member]
Loans receivable	0	0
Financial Asset, Past Due [Member] | Commercial Loans and Leases [Member] | Commercial Loans [Member]
Loans receivable	256,000	926,000
Financial Asset, Past Due [Member] | Commercial Loans and Leases [Member] | Equipment Finance Leases, Government [Member]
Loans receivable	802,000	8,175,000
Financial Asset, Past Due [Member] | Commercial Loans and Leases [Member] | Equipment Finance Leases, Investment-rated [Member]
Loans receivable	0	348,000
Financial Asset, Past Due [Member] | Consumer Portfolio Segment [Member]
Loans receivable	7,000	13,000
Financial Asset, Not Past Due [Member]
Loans receivable	908,349,000	1,028,283,000
Financial Asset, Not Past Due [Member] | Real Estate Portfolio [Member] | One-to-Four Family Residential Real Estate [Member]
Loans receivable	15,507,000	18,878,000
Financial Asset, Not Past Due [Member] | Real Estate Portfolio [Member] | Multi-family Mortgage [Member] | Senior Mortgage Notes [Member]
Loans receivable	483,349,000	485,281,000
Financial Asset, Not Past Due [Member] | Real Estate Portfolio [Member] | Multi-family Mortgage [Member] | Junior Mortgage Notes [Member]
Loans receivable	39,533,000	42,179,000
Financial Asset, Not Past Due [Member] | Real Estate Portfolio [Member] | Nonresidential Real Estate, Owner Occupied [Member]
Loans receivable	17,154,000	20,901,000
Financial Asset, Not Past Due [Member] | Real Estate Portfolio [Member] | Nonresidential Real Estate, Non-owner Occupied [Member]
Loans receivable	92,252,000	97,115,000
Financial Asset, Not Past Due [Member] | Commercial Loans and Leases [Member] | Commercial Loans [Member]
Loans receivable	156,184,000	208,770,000
Financial Asset, Not Past Due [Member] | Commercial Loans and Leases [Member] | Equipment Finance Leases, Government [Member]
Loans receivable	64,781,000	105,134,000
Financial Asset, Not Past Due [Member] | Commercial Loans and Leases [Member] | Equipment Finance Leases, Investment-rated [Member]
Loans receivable	37,749,000	48,674,000
Financial Asset, Not Past Due [Member] | Consumer Portfolio Segment [Member]
Loans receivable	$ 1,840,000	$ 1,351,000

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
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-Name Accounting Standards Codification
-Section 50
-Paragraph 5
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-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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- Definition

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Topic 310
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-Name Accounting Standards Codification
-Section 50
-Paragraph 7
-Subparagraph (a)
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-URI https://asc.fasb.org/1943274/2147481962/310-10-50-7

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-K (SK)
-Number 229
-Section 1405
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-Publisher SEC

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
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-Publisher FASB
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