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Note 4 - Allowance for Loan Losses - Impaired Loans and Related Allowances (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Impaired loans, unpaid principal balance	$ 6,967	$ 1,639
Impaired loans, recorded investment with no allowance	896	1,020
Impaired loans, recorded investment with allowance	5,818	439
Impaired loans, total recorded investment	6,714	1,459
Impaired loans, related allowance	2,223	33
Impaired loans, average recorded investment	3,877	1,926
Impaired loans, interest income recognized	187	5
Real Estate 1 [Member] | Construction and Land Development [Member]
Impaired loans, unpaid principal balance	325	401
Impaired loans, recorded investment with no allowance	276	70
Impaired loans, recorded investment with allowance	0	297
Impaired loans, total recorded investment	276	367
Impaired loans, related allowance	0	22
Impaired loans, average recorded investment	344	369
Impaired loans, interest income recognized	0	1
Real Estate 1 [Member] | Secured by Multi-family Residential Properties [Member]
Impaired loans, unpaid principal balance	568	729
Impaired loans, recorded investment with no allowance	449	488
Impaired loans, recorded investment with allowance	0	142
Impaired loans, total recorded investment	449	630
Impaired loans, related allowance	0	11
Impaired loans, average recorded investment	517	769
Impaired loans, interest income recognized	1	1
Real Estate 1 [Member] | Other Real Estate Loans [Member]
Impaired loans, unpaid principal balance	4,492	509
Impaired loans, recorded investment with no allowance	171	462
Impaired loans, recorded investment with allowance	4,270	0
Impaired loans, total recorded investment	4,441	462
Impaired loans, related allowance	2,065	0
Impaired loans, average recorded investment	2,623	766
Impaired loans, interest income recognized	109	3
Commercial and Industrial Loans [Member]
Impaired loans, unpaid principal balance	1,582	0
Impaired loans, recorded investment with no allowance	0	0
Impaired loans, recorded investment with allowance	1,548	0
Impaired loans, total recorded investment	1,548	0
Impaired loans, related allowance	158	0
Impaired loans, average recorded investment	393	22
Impaired loans, interest income recognized	$ 77	$ 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
-SubTopic 10
-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

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=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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-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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-Topic 310
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-Paragraph 15
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