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Note 4 - Allowance for Loan Losses - Impaired Loans and Related Allowances (Details) - USD ($) $ in Thousands	9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Impaired loans, unpaid principal balance	$ 2,433	$ 7,149	$ 6,967
Impaired loans, recorded investment with no allowance	623	1,113	896
Impaired loans, recorded investment with allowance	1,535	5,861	5,818
Impaired loans, total recorded investment	2,158	6,974	6,714
Impaired loans, related allowance	84	2,289	2,223
Impaired loans, average recorded investment	5,400	2,882	3,877
Impaired loans, interest income recognized	4	187	187
Real Estate 1 [Member] | Construction and Land Development [Member]
Impaired loans, unpaid principal balance	0	325	325
Impaired loans, recorded investment with no allowance	0	283	276
Impaired loans, recorded investment with allowance	0	0	0
Impaired loans, total recorded investment	0	283	276
Impaired loans, related allowance	0	0	0
Impaired loans, average recorded investment	273	366	344
Impaired loans, interest income recognized	0	0	0
Real Estate 1 [Member] | Secured by Multi-family Residential Properties [Member]
Impaired loans, unpaid principal balance	611	578	568
Impaired loans, recorded investment with no allowance	470	469	449
Impaired loans, recorded investment with allowance	0	0	0
Impaired loans, total recorded investment	470	469	449
Impaired loans, related allowance	0	0	0
Impaired loans, average recorded investment	420	536	517
Impaired loans, interest income recognized	3	1	1
Real Estate 1 [Member] | Other Real Estate Loans [Member]
Impaired loans, unpaid principal balance	167	4,698	4,492
Impaired loans, recorded investment with no allowance	153	361	171
Impaired loans, recorded investment with allowance	0	4,313	4,270
Impaired loans, total recorded investment	153	4,674	4,441
Impaired loans, related allowance	0	2,108	2,065
Impaired loans, average recorded investment	3,159	1,974	2,623
Impaired loans, interest income recognized	1	109	109
Commercial and Industrial Loans [Member]
Impaired loans, unpaid principal balance	1,655	1,548	1,582
Impaired loans, recorded investment with no allowance	0	0	0
Impaired loans, recorded investment with allowance	1,535	1,548	1,548
Impaired loans, total recorded investment	1,535	1,548	1,548
Impaired loans, related allowance	84	181	158
Impaired loans, average recorded investment	1,548	6	393
Impaired loans, interest income recognized	$ 0	$ 77	$ 77

X

- Definition

Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=123577603&loc=d3e5212-111524

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-Topic 310
-SubTopic 10
-Section 50
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=123577603&loc=d3e5258-111524

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- Definition

Amount of interest income recognized on a cash-basis method of accounting that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
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-URI http://asc.fasb.org/extlink&oid=123577603&loc=d3e5212-111524

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+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 14A
-Subparagraph (b)
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-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=123577603&loc=d3e5212-111524

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-Publisher FASB
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-Paragraph 15
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