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Note 4 - Loans Receivable - Aging of the Recorded Investment of Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Loans receivable	$ 1,235,320	$ 1,234,872
Loans receivable, nonaccrual	8,862	1,407
Real Estate Portfolio [Member] | One-to-Four Family Residential Real Estate [Member]
Loans receivable	21,475	23,133
Loans receivable, nonaccrual	55	92
Real Estate Portfolio [Member] | Multi-family Mortgage [Member]
Loans receivable	544,673	537,394
Real Estate Portfolio [Member] | Multi-family Mortgage [Member] | Senior Mortgage Notes [Member]
Loans receivable	501,451	494,988
Loans receivable, nonaccrual	0	0
Real Estate Portfolio [Member] | Multi-family Mortgage [Member] | Junior Mortgage Notes [Member]
Loans receivable	43,222	42,406
Loans receivable, nonaccrual	0	0
Real Estate Portfolio [Member] | Nonresidential Real Estate, Owner Occupied [Member]
Loans receivable	22,264	22,617
Loans receivable, nonaccrual	0	0
Real Estate Portfolio [Member] | Nonresidential Real Estate, Non-owner Occupied [Member]
Loans receivable	101,096	97,088
Loans receivable, nonaccrual	0	0
Commercial Loans and Leases [Member] | Commercial Loans [Member]
Loans receivable	285,404	283,453
Loans receivable, nonaccrual	384	1,310
Commercial Loans and Leases [Member] | Equipment Finance Leases, Government [Member]
Loans receivable	202,936	211,583
Loans receivable, nonaccrual	8,420	0
Commercial Loans and Leases [Member] | Equipment Finance Leases, Investment-rated [Member]
Loans receivable	55,876	58,020
Loans receivable, nonaccrual	3	0
Consumer Portfolio Segment [Member]
Loans receivable	1,596	1,584
Loans receivable, nonaccrual	0	5
Financial Asset, 30 to 59 Days Past Due [Member]
Loans receivable	13,971	4,912
Financial Asset, 30 to 59 Days Past Due [Member] | Real Estate Portfolio [Member] | One-to-Four Family Residential Real Estate [Member]
Loans receivable	496	411
Financial Asset, 30 to 59 Days Past Due [Member] | Real Estate Portfolio [Member] | Multi-family Mortgage [Member] | Senior Mortgage Notes [Member]
Loans receivable	786	31
Financial Asset, 30 to 59 Days Past Due [Member] | Real Estate Portfolio [Member] | Multi-family Mortgage [Member] | Junior Mortgage Notes [Member]
Loans receivable	362	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	5,106	2,424
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial Loans and Leases [Member] | Equipment Finance Leases, Government [Member]
Loans receivable	6,421	2,034
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial Loans and Leases [Member] | Equipment Finance Leases, Investment-rated [Member]
Loans receivable	794	0
Financial Asset, 30 to 59 Days Past Due [Member] | Consumer Portfolio Segment [Member]
Loans receivable	6	12
Financial Asset, 60 to 89 Days Past Due [Member]
Loans receivable	1,916	5,546
Financial Asset, 60 to 89 Days Past Due [Member] | Real Estate Portfolio [Member] | One-to-Four Family Residential Real Estate [Member]
Loans receivable	16	19
Financial Asset, 60 to 89 Days Past Due [Member] | Real Estate Portfolio [Member] | Multi-family Mortgage [Member] | Senior Mortgage Notes [Member]
Loans receivable	148	0
Financial Asset, 60 to 89 Days Past Due [Member] | Real Estate Portfolio [Member] | Multi-family Mortgage [Member] | Junior Mortgage Notes [Member]
Loans receivable	185	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	1,139	336
Financial Asset, 60 to 89 Days Past Due [Member] | Commercial Loans and Leases [Member] | Equipment Finance Leases, Government [Member]
Loans receivable	423	5,106
Financial Asset, 60 to 89 Days Past Due [Member] | Commercial Loans and Leases [Member] | Equipment Finance Leases, Investment-rated [Member]
Loans receivable	0	81
Financial Asset, 60 to 89 Days Past Due [Member] | Consumer Portfolio Segment [Member]
Loans receivable	5	4
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans receivable	0	238
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	111
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	127
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	15,887	10,696
Financial Asset, Past Due [Member] | Real Estate Portfolio [Member] | One-to-Four Family Residential Real Estate [Member]
Loans receivable	512	430
Financial Asset, Past Due [Member] | Real Estate Portfolio [Member] | Multi-family Mortgage [Member] | Senior Mortgage Notes [Member]
Loans receivable	934	31
Financial Asset, Past Due [Member] | Real Estate Portfolio [Member] | Multi-family Mortgage [Member] | Junior Mortgage Notes [Member]
Loans receivable	547	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	6,245	2,871
Financial Asset, Past Due [Member] | Commercial Loans and Leases [Member] | Equipment Finance Leases, Government [Member]
Loans receivable	6,844	7,140
Financial Asset, Past Due [Member] | Commercial Loans and Leases [Member] | Equipment Finance Leases, Investment-rated [Member]
Loans receivable	794	208
Financial Asset, Past Due [Member] | Consumer Portfolio Segment [Member]
Loans receivable	11	16
Financial Asset, Not Past Due [Member]
Loans receivable	1,210,571	1,222,769
Financial Asset, Not Past Due [Member] | Real Estate Portfolio [Member] | One-to-Four Family Residential Real Estate [Member]
Loans receivable	20,908	22,611
Financial Asset, Not Past Due [Member] | Real Estate Portfolio [Member] | Multi-family Mortgage [Member] | Senior Mortgage Notes [Member]
Loans receivable	500,517	494,957
Financial Asset, Not Past Due [Member] | Real Estate Portfolio [Member] | Multi-family Mortgage [Member] | Junior Mortgage Notes [Member]
Loans receivable	42,675	42,406
Financial Asset, Not Past Due [Member] | Real Estate Portfolio [Member] | Nonresidential Real Estate, Owner Occupied [Member]
Loans receivable	22,264	22,617
Financial Asset, Not Past Due [Member] | Real Estate Portfolio [Member] | Nonresidential Real Estate, Non-owner Occupied [Member]
Loans receivable	101,096	97,088
Financial Asset, Not Past Due [Member] | Commercial Loans and Leases [Member] | Commercial Loans [Member]
Loans receivable	278,775	279,272
Financial Asset, Not Past Due [Member] | Commercial Loans and Leases [Member] | Equipment Finance Leases, Government [Member]
Loans receivable	187,672	204,443
Financial Asset, Not Past Due [Member] | Commercial Loans and Leases [Member] | Equipment Finance Leases, Investment-rated [Member]
Loans receivable	55,079	57,812
Financial Asset, Not Past Due [Member] | Consumer Portfolio Segment [Member]
Loans receivable	$ 1,585	$ 1,563

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/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 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 310
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-Section 45
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481990/310-10-45-2

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 942
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-Name Accounting Standards Codification
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-Paragraph 1
-Subparagraph (SX 210.9-03(7))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1

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X

- Definition

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-16

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-K (SK)
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-Subparagraph (3)
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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