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Note 4 - Loans Receivable - Aging of the Recorded Investment of Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Loans receivable	$ 1,016,229	$ 1,059,106
Loans receivable, nonaccrual	20,509	21,331
Real Estate Portfolio [Member] | One-to-Four Family Residential Real Estate [Member]
Loans receivable	18,247	18,945
Loans receivable, nonaccrual	34	37
Real Estate Portfolio [Member] | Multi-family Mortgage [Member]
Loans receivable	526,087	527,460
Real Estate Portfolio [Member] | Multi-family Mortgage [Member] | Senior Mortgage Notes [Member]
Loans receivable	484,413	485,281
Loans receivable, nonaccrual	0	0
Real Estate Portfolio [Member] | Multi-family Mortgage [Member] | Junior Mortgage Notes [Member]
Loans receivable	41,674	42,179
Loans receivable, nonaccrual	0	0
Real Estate Portfolio [Member] | Nonresidential Real Estate, Owner Occupied [Member]
Loans receivable	15,712	20,901
Loans receivable, nonaccrual	0	0
Real Estate Portfolio [Member] | Nonresidential Real Estate, Non-owner Occupied [Member]
Loans receivable	94,607	97,115
Loans receivable, nonaccrual	0	0
Commercial Loans and Leases [Member] | Commercial Loans [Member]
Loans receivable	195,932	211,981
Loans receivable, nonaccrual	1,586	2,285
Commercial Loans and Leases [Member] | Equipment Finance Leases, Government [Member]
Loans receivable	121,801	132,265
Loans receivable, nonaccrual	18,889	18,956
Commercial Loans and Leases [Member] | Equipment Finance Leases, Investment-rated [Member]
Loans receivable	42,595	49,075
Loans receivable, nonaccrual	0	53
Consumer Portfolio Segment [Member]
Loans receivable	1,248	1,364
Loans receivable, nonaccrual	0	0
Financial Asset, 30 to 59 Days Past Due [Member]
Loans receivable	4,375	3,408
Financial Asset, 30 to 59 Days Past Due [Member] | Real Estate Portfolio [Member] | One-to-Four Family Residential Real Estate [Member]
Loans receivable	544	12
Financial Asset, 30 to 59 Days Past Due [Member] | Real Estate Portfolio [Member] | Multi-family Mortgage [Member] | Senior Mortgage Notes [Member]
Loans receivable	112	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	380	0
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial Loans and Leases [Member] | Commercial Loans [Member]
Loans receivable	1,007	234
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial Loans and Leases [Member] | Equipment Finance Leases, Government [Member]
Loans receivable	442	3,147
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial Loans and Leases [Member] | Equipment Finance Leases, Investment-rated [Member]
Loans receivable	1,884	7
Financial Asset, 30 to 59 Days Past Due [Member] | Consumer Portfolio Segment [Member]
Loans receivable	6	8
Financial Asset, 60 to 89 Days Past Due [Member]
Loans receivable	17	5,077
Financial Asset, 60 to 89 Days Past Due [Member] | Real Estate Portfolio [Member] | One-to-Four Family Residential Real Estate [Member]
Loans receivable	0	18
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	15	26
Financial Asset, 60 to 89 Days Past Due [Member] | Commercial Loans and Leases [Member] | Equipment Finance Leases, Government [Member]
Loans receivable	0	5,028
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	2	5
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans receivable	0	1,007
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
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
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	4,392	9,492
Financial Asset, Past Due [Member] | Real Estate Portfolio [Member] | One-to-Four Family Residential Real Estate [Member]
Loans receivable	544	30
Financial Asset, Past Due [Member] | Real Estate Portfolio [Member] | Multi-family Mortgage [Member] | Senior Mortgage Notes [Member]
Loans receivable	112	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	380	0
Financial Asset, Past Due [Member] | Commercial Loans and Leases [Member] | Commercial Loans [Member]
Loans receivable	1,022	926
Financial Asset, Past Due [Member] | Commercial Loans and Leases [Member] | Equipment Finance Leases, Government [Member]
Loans receivable	442	8,175
Financial Asset, Past Due [Member] | Commercial Loans and Leases [Member] | Equipment Finance Leases, Investment-rated [Member]
Loans receivable	1,884	348
Financial Asset, Past Due [Member] | Consumer Portfolio Segment [Member]
Loans receivable	8	13
Financial Asset, Not Past Due [Member]
Loans receivable	991,328	1,028,283
Financial Asset, Not Past Due [Member] | Real Estate Portfolio [Member] | One-to-Four Family Residential Real Estate [Member]
Loans receivable	17,669	18,878
Financial Asset, Not Past Due [Member] | Real Estate Portfolio [Member] | Multi-family Mortgage [Member] | Senior Mortgage Notes [Member]
Loans receivable	484,301	485,281
Financial Asset, Not Past Due [Member] | Real Estate Portfolio [Member] | Multi-family Mortgage [Member] | Junior Mortgage Notes [Member]
Loans receivable	41,674	42,179
Financial Asset, Not Past Due [Member] | Real Estate Portfolio [Member] | Nonresidential Real Estate, Owner Occupied [Member]
Loans receivable	15,712	20,901
Financial Asset, Not Past Due [Member] | Real Estate Portfolio [Member] | Nonresidential Real Estate, Non-owner Occupied [Member]
Loans receivable	94,227	97,115
Financial Asset, Not Past Due [Member] | Commercial Loans and Leases [Member] | Commercial Loans [Member]
Loans receivable	193,324	208,770
Financial Asset, Not Past Due [Member] | Commercial Loans and Leases [Member] | Equipment Finance Leases, Government [Member]
Loans receivable	102,470	105,134
Financial Asset, Not Past Due [Member] | Commercial Loans and Leases [Member] | Equipment Finance Leases, Investment-rated [Member]
Loans receivable	40,711	48,674
Financial Asset, Not Past Due [Member] | Consumer Portfolio Segment [Member]
Loans receivable	$ 1,240	$ 1,351

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

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
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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
-Name Regulation S-K (SK)
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
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