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Note 4 - Loans Receivable - Loans Receivable (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
Loans receivable	$ 1,036,175	$ 1,009,958
Net deferred loan origination costs	(60)	(371)
Allowance for loan losses	(7,395)	(7,751)	$ (8,112)	$ (7,632)
Loans, net	1,028,840	1,002,578
Commercial Portfolio Segment [Member]
Loans receivable	442,706	405,057
Allowance for loan losses	(1,377)	(1,536)	(2,055)	(2,065)
Consumer Portfolio Segment [Member]
Loans receivable	1,756	1,812
Allowance for loan losses	(47)	(54)	(46)	(40)
One-to-Four Family Residential Real Estate [Member] | Real Estate Portfolio [Member]
Loans receivable	38,236	41,691
Allowance for loan losses	(465)	(518)	(682)	(675)
Multi-family Mortgage [Member] | Real Estate Portfolio [Member]
Loans receivable	440,824	452,241
Allowance for loan losses	(3,902)	(4,062)	(3,869)	(3,676)
Nonresidential Real Estate [Member] | Real Estate Portfolio [Member]
Loans receivable	112,154	108,658
Allowance for loan losses	(1,592)	(1,569)	$ (1,460)	$ (1,176)
Construction and Land Loans [Member]
Loans receivable	499	499
Allowance for loan losses	$ (12)	(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.

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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.

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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.

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