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Note 4 - Loans Receivable - Allowance for Loan Losses and Loans Receivable (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
Allowance for loan losses, individually evaluated for impairment	$ 28	$ 28
Allowance for loan losses, collectively evaluated for impairment	7,367	7,723
Allowance for loan losses	7,395	7,751	$ 8,112	$ 7,632
Loan balances, individually evaluated for impairment	2,379	2,534
Loan balances, collectively evaluated for impairment	1,033,796	1,007,424
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 receivable, net of allowance for loan losses: March 31, 2021, $7,395 and December 31, 2020, $7,751	1,028,840	1,002,578
Allowance for loan losses	7,395	7,751	8,112	7,632
Real Estate Portfolio [Member] | One-to-Four Family Residential Real Estate [Member]
Allowance for loan losses, individually evaluated for impairment	0	0
Allowance for loan losses, collectively evaluated for impairment	465	518
Allowance for loan losses	465	518	682	675
Loan balances, individually evaluated for impairment	1,568	1,718
Loan balances, collectively evaluated for impairment	36,668	39,973
Loans receivable	38,236	41,691
Allowance for loan losses	(465)	(518)	(682)	(675)
Allowance for loan losses	465	518	682	675
Real Estate Portfolio [Member] | Multi-family Mortgage [Member]
Allowance for loan losses, individually evaluated for impairment	0	0
Allowance for loan losses, collectively evaluated for impairment	3,902	4,062
Allowance for loan losses	3,902	4,062	3,869	3,676
Loan balances, individually evaluated for impairment	515	520
Loan balances, collectively evaluated for impairment	440,309	451,721
Loans receivable	440,824	452,241
Allowance for loan losses	(3,902)	(4,062)	(3,869)	(3,676)
Allowance for loan losses	3,902	4,062	3,869	3,676
Real Estate Portfolio [Member] | Nonresidential Real Estate [Member]
Allowance for loan losses, individually evaluated for impairment	28	28
Allowance for loan losses, collectively evaluated for impairment	1,564	1,541
Allowance for loan losses	1,592	1,569	1,460	1,176
Loan balances, individually evaluated for impairment	296	296
Loan balances, collectively evaluated for impairment	111,858	108,362
Loans receivable	112,154	108,658
Allowance for loan losses	(1,592)	(1,569)	(1,460)	(1,176)
Allowance for loan losses	1,592	1,569	1,460	1,176
Construction and Land Loans [Member]
Allowance for loan losses, individually evaluated for impairment	0	0
Allowance for loan losses, collectively evaluated for impairment	12	12
Allowance for loan losses	12	12
Loan balances, individually evaluated for impairment	0	0
Loan balances, collectively evaluated for impairment	499	499
Loans receivable	499	499
Allowance for loan losses	(12)	(12)
Allowance for loan losses	12	12
Commercial Portfolio Segment [Member]
Allowance for loan losses, individually evaluated for impairment	0	0
Allowance for loan losses, collectively evaluated for impairment	1,377	1,536
Allowance for loan losses	1,377	1,536	2,055	2,065
Loan balances, individually evaluated for impairment	0	0
Loan balances, collectively evaluated for impairment	442,706	405,057
Loans receivable	442,706	405,057
Allowance for loan losses	(1,377)	(1,536)	(2,055)	(2,065)
Allowance for loan losses	1,377	1,536	2,055	2,065
Consumer Portfolio Segment [Member]
Allowance for loan losses, individually evaluated for impairment	0	0
Allowance for loan losses, collectively evaluated for impairment	47	54
Allowance for loan losses	47	54	46	40
Loan balances, individually evaluated for impairment	0	0
Loan balances, collectively evaluated for impairment	1,756	1,812
Loans receivable	1,756	1,812
Allowance for loan losses	(47)	(54)	(46)	(40)
Allowance for loan losses	$ 47	$ 54	$ 46	$ 40

X

- Definition

The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.

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-Section 50
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Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.

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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 of deferred interest and fee income, unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of acquired loans. Excludes amounts 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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