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Note 4 - Loans Receivable - Activity in the Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Beginning balance				$ 7,632				$ 8,470	$ 7,632	$ 8,470
Provision for loan losses	$ (271)	$ (187)	$ 42	471	$ 89	$ (134)	$ 3,957	(87)	55	3,825
Loans charged off									(71)	(4,779)
Recoveries									135	116
Real Estate Portfolio [Member]
Loans charged off									0
Commercial Portfolio Segment [Member]
Beginning balance				2,065				2,272	2,065	2,272
Provision for loan losses									(533)	4,226
Loans charged off									(62)	(4,443)
Recoveries									4	10
Consumer Portfolio Segment [Member]
Beginning balance				40				28	40	28
Provision for loan losses									76	43
Loans charged off										(31)
Recoveries									0	0
One-to-Four Family Residential Real Estate [Member] | Real Estate Portfolio [Member]
Beginning balance				675				699	675	699
Provision for loan losses									(185)	123
Loans charged off									(9)	(222)
Recoveries									37	75
Multi-family Mortgage [Member] | Real Estate Portfolio [Member]
Beginning balance				3,676				3,991	3,676	3,991
Provision for loan losses									292	(346)
Loans charged off									0	0
Recoveries									94	31
Nonresidential Real Estate [Member] | Real Estate Portfolio [Member]
Beginning balance				1,176				1,476	1,176	1,476
Provision for loan losses									393	(217)
Loans charged off										(83)
Recoveries									0	0
Construction and Land Loans [Member]
Beginning balance				$ 0				$ 4	0	4
Provision for loan losses									12	(4)
Loans charged off									0	0
Recoveries									$ 0	$ 0

X

- Definition

Amount of recovery of loans and lease receivables which had previously been fully or partially written-off as bad debts.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(4)
-URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524

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- Definition

Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
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-Paragraph 11B
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- 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://fasb.org/us-gaap/role/ref/legacyRef
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-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
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Amount of expense related to estimated loss from loan and lease transactions.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
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