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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, 2020	Sep. 30, 2019	Dec. 31, 2019
Impaired loans, unpaid principal balance	$ 7,149	$ 1,699	$ 1,639
Impaired loans, recorded investment with no allowance	1,113	1,016	1,020
Impaired loans, recorded investment with allowance	5,861	550	439
Impaired loans, total recorded investment	6,974	1,566	1,459
Impaired loans, related allowance	2,289	74	33
Impaired loans, average recorded investment	2,882	2,056	1,926
Impaired loans, interest income recognized	187	5	5
Real Estate 1 [Member] | Construction and Land Development [Member]
Impaired loans, unpaid principal balance	325	403	401
Impaired loans, recorded investment with no allowance	283	0	70
Impaired loans, recorded investment with allowance	0	376	297
Impaired loans, total recorded investment	283	376	367
Impaired loans, related allowance	0	31	22
Impaired loans, average recorded investment	366	368	369
Impaired loans, interest income recognized	0	1	1
Real Estate 1 [Member] | Secured by Multi-family Residential Properties [Member]
Impaired loans, unpaid principal balance	578	781	729
Impaired loans, recorded investment with no allowance	469	543	488
Impaired loans, recorded investment with allowance	0	147	142
Impaired loans, total recorded investment	469	690	630
Impaired loans, related allowance	0	16	11
Impaired loans, average recorded investment	536	800	769
Impaired loans, interest income recognized	1	1	1
Real Estate 1 [Member] | Other Real Estate Loans [Member]
Impaired loans, unpaid principal balance	4,698	515	509
Impaired loans, recorded investment with no allowance	361	473	462
Impaired loans, recorded investment with allowance	4,313	27	0
Impaired loans, total recorded investment	4,674	500	462
Impaired loans, related allowance	2,108	27	0
Impaired loans, average recorded investment	1,974	858	766
Impaired loans, interest income recognized	109	3	3
Commercial and Industrial Loans [Member]
Impaired loans, unpaid principal balance	1,548	0	0
Impaired loans, recorded investment with no allowance	0	0	0
Impaired loans, recorded investment with allowance	1,548	0	0
Impaired loans, total recorded investment	1,548	0	0
Impaired loans, related allowance	181	0	0
Impaired loans, average recorded investment	6	30	22
Impaired loans, interest income recognized	$ 77	$ 0	$ 0

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=121611835&loc=d3e5212-111524

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-Topic 310
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-Section 50
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=121611835&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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=121611835&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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-Topic 310
-SubTopic 10
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-URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5212-111524

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-Paragraph 15
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