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Note 4 - Loans Receivable - Activity in the Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Beginning balance	$ 7,395	$ 8,112	$ 7,751	$ 7,632
Provision for (recovery of ) loan losses	(678)	42	(1,013)	513
Loans charged off	(6)	(17)	(101)	(35)
Recoveries	146	19	220	46
Total ending allowance balance	6,857	8,156	6,857	8,156
Commercial Portfolio Segment [Member]
Beginning balance	1,377	2,055	1,536	2,065
Provision for (recovery of ) loan losses	(87)	(398)	(161)	(410)
Loans charged off	0	0	(86)	0
Recoveries	87	1	88	3
Total ending allowance balance	1,377	1,658	1,377	1,658
Consumer Portfolio Segment [Member]
Beginning balance	47	46	54	40
Provision for (recovery of ) loan losses	6	17	6	36
Loans charged off	(6)	(17)	(15)	(30)
Recoveries	0	0	2	0
Total ending allowance balance	47	46	47	46
One-to-Four Family Residential Real Estate [Member] | Real Estate Portfolio [Member]
Beginning balance	465	682	518	675
Provision for (recovery of ) loan losses	(118)	(20)	(231)	(21)
Loans charged off	0	0	0	(5)
Recoveries	49	3	109	16
Total ending allowance balance	396	665	396	665
Multi-family Mortgage [Member] | Real Estate Portfolio [Member]
Beginning balance	3,902	3,869	4,062	3,676
Provision for (recovery of ) loan losses	(222)	301	(393)	482
Loans charged off	0	0	0	0
Recoveries	10	15	21	27
Total ending allowance balance	3,690	4,185	3,690	4,185
Nonresidential Real Estate [Member] | Real Estate Portfolio [Member]
Beginning balance	1,592	1,460	1,569	1,176
Provision for (recovery of ) loan losses	(256)	142	(233)	426
Loans charged off	0	0	0	0
Recoveries	0	0	0	0
Total ending allowance balance	1,336	$ 1,602	1,336	$ 1,602
Construction and Land Loans [Member]
Beginning balance	12		12
Provision for (recovery of ) loan losses	(1)		(1)
Loans charged off	0		0
Recoveries	0		0
Total ending allowance balance	$ 11		$ 11

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

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-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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