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Note 4 - Loans Receivable - Activity in the Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Beginning balance	$ 6,857	$ 8,156	$ 7,751	$ 7,632
(Recovery of) provision for loan losses	(6)	(187)	(1,019)	326
Loans charged off	(2)	(16)	(103)	(51)
Recoveries	46	58	266	104
Total ending allowance balance	6,895	8,011	6,895	8,011
Commercial Portfolio Segment [Member]
Beginning balance	1,377	1,658	1,536	2,065
(Recovery of) provision for loan losses	176	(178)	15	(588)
Loans charged off	0	0	(86)	0
Recoveries	1	0	89	3
Total ending allowance balance	1,554	1,480	1,554	1,480
Consumer Portfolio Segment [Member]
Beginning balance	47	46	54	40
(Recovery of) provision for loan losses	(2)	16	4	52
Loans charged off	(2)	(14)	(17)	(44)
Recoveries	0	0	2	0
Total ending allowance balance	43	48	43	48
One-to-Four Family Residential Real Estate [Member] | Real Estate Portfolio [Member]
Beginning balance	396	665	518	675
(Recovery of) provision for loan losses	(33)	(42)	(264)	(63)
Loans charged off	0	(2)	0	(7)
Recoveries	38	2	147	18
Total ending allowance balance	401	623	401	623
Multi-family Mortgage [Member] | Real Estate Portfolio [Member]
Beginning balance	3,690	4,185	4,062	3,676
(Recovery of) provision for loan losses	(118)	(98)	(511)	384
Loans charged off	0	0	0	0
Recoveries	7	56	28	83
Total ending allowance balance	3,579	4,143	3,579	4,143
Nonresidential Real Estate [Member] | Real Estate Portfolio [Member]
Beginning balance	1,336	1,602	1,569	1,176
(Recovery of) provision for loan losses	(30)	115	(263)	541
Loans charged off	0	0	0	0
Recoveries	0	0	0	0
Total ending allowance balance	1,306	$ 1,717	1,306	$ 1,717
Construction and Land Loans [Member]
Beginning balance	11		12
(Recovery of) provision for loan losses	1		0
Loans charged off	0		0
Recoveries	0		0
Total ending allowance balance	$ 12		$ 12

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=123577603&loc=SL6953423-111524

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X

- Definition

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

+ 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)(3)
-URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524

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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
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section S99
-Paragraph 4
-Subparagraph (SAB Topic 6.L.1)
-URI http://asc.fasb.org/extlink&oid=122038336&loc=d3e74567-122707

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
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-URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 310
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (b)(1)(ii)
-URI http://asc.fasb.org/extlink&oid=121614798&loc=d3e15032-111544

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-URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524

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X

- Definition

Amount of expense related to estimated loss from loan and lease transactions.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
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-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.11)
-URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260

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