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Note 4 - Loans Receivable - Allowance for Loan Losses and Loans Receivable (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Allowance for loan losses, individually evaluated for impairment	$ 28	$ 0
Allowance for loan losses, collectively evaluated for impairment	7,723	7,632
Allowance for loan losses	7,751	7,632	$ 8,470
Loan balances, individually evaluated for impairment	2,534	2,743
Loan balances, collectively evaluated for impairment	1,007,424	1,171,985
Loans receivable	1,009,958	1,174,728
Net deferred loan origination costs	371	912
Allowance for loan losses	(7,751)	(7,632)	(8,470)
Loans receivable, net of allowance for loan losses: December 31, 2020, $7,751 and December 31, 2019, $7,632	1,002,578	1,168,008
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	518	675
Allowance for loan losses	518	675	699
Loan balances, individually evaluated for impairment	1,718	1,835
Loan balances, collectively evaluated for impairment	39,973	53,915
Loans receivable	41,691	55,750
Allowance for loan losses	(518)	(675)	(699)
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	4,062	3,676
Allowance for loan losses	4,062	3,676	3,991
Loan balances, individually evaluated for impairment	520	620
Loan balances, collectively evaluated for impairment	451,721	563,130
Loans receivable	452,241	563,750
Allowance for loan losses	(4,062)	(3,676)	(3,991)
Real Estate Portfolio [Member] | Nonresidential Real Estate [Member]
Allowance for loan losses, individually evaluated for impairment	28	0
Allowance for loan losses, collectively evaluated for impairment	1,541	1,176
Allowance for loan losses	1,569	1,176	1,476
Loan balances, individually evaluated for impairment	296	288
Loan balances, collectively evaluated for impairment	108,362	134,386
Loans receivable	108,658	134,674
Allowance for loan losses	(1,569)	(1,176)	(1,476)
Construction and Land Loans [Member]
Allowance for loan losses, individually evaluated for impairment	0
Allowance for loan losses, collectively evaluated for impairment	12
Allowance for loan losses	12
Loan balances, individually evaluated for impairment	0
Loan balances, collectively evaluated for impairment	499
Loans receivable	499
Allowance for loan losses	(12)
Commercial Portfolio Segment [Member]
Allowance for loan losses, individually evaluated for impairment	0	0
Allowance for loan losses, collectively evaluated for impairment	1,536	2,065
Allowance for loan losses	1,536	2,065	2,272
Loan balances, individually evaluated for impairment	0	0
Loan balances, collectively evaluated for impairment	405,057	418,343
Loans receivable	405,057	418,343
Allowance for loan losses	(1,536)	(2,065)	(2,272)
Consumer Portfolio Segment [Member]
Allowance for loan losses, individually evaluated for impairment	0	0
Allowance for loan losses, collectively evaluated for impairment	54	40
Allowance for loan losses	54	40	28
Loan balances, individually evaluated for impairment	0	0
Loan balances, collectively evaluated for impairment	1,812	2,211
Loans receivable	1,812	2,211
Allowance for loan losses	$ (54)	$ (40)	$ (28)

X

- Definition

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

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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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