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Note 4 - Loans Receivable - Loans Receivable (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2019
Loans receivable	$ 1,053,896		$ 1,009,958
Net deferred loan origination costs	55		371
Allowance for loan losses	(6,895)	$ (6,857)	(7,751)	$ (8,011)	$ (8,156)	$ (7,632)
Loans, net	1,047,056		1,002,578
Commercial Portfolio Segment [Member]
Loans receivable	483,705		405,057
Allowance for loan losses	(1,554)	(1,377)	(1,536)	(1,480)	(1,658)	(2,065)
Consumer Portfolio Segment [Member]
Loans receivable	1,760		1,812
Allowance for loan losses	(43)	(47)	(54)	(48)	(46)	(40)
One-to-Four Family Residential Real Estate [Member] | Real Estate Portfolio [Member]
Loans receivable	31,829		41,691
Allowance for loan losses	(401)	(396)	(518)	(623)	(665)	(675)
Multi-family Mortgage [Member] | Real Estate Portfolio [Member]
Loans receivable	435,634		452,241
Allowance for loan losses	(3,579)	(3,690)	(4,062)	(4,143)	(4,185)	(3,676)
Nonresidential Real Estate [Member] | Real Estate Portfolio [Member]
Loans receivable	100,469		108,658
Allowance for loan losses	(1,306)	(1,336)	(1,569)	$ (1,717)	$ (1,602)	$ (1,176)
Construction and Land Loans [Member]
Loans receivable	499		499
Allowance for loan losses	$ (12)	$ (11)	(12)
Construction and Land Loans [Member] | Commercial Portfolio Segment [Member]
Loans receivable			$ 499

X

- Definition

Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
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-Topic 310
-SubTopic 10
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- Definition

Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

+ References

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Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale.

+ References

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Amount of deferred fees paid by borrowers and unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of loans that are being amortized into income as an adjustment to yield. Excludes amounts for loans and leases covered under loss sharing agreements.

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