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Note 4 - Allowance for Loan Losses - Impaired Loans and Related Allowances (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Impaired loans, unpaid principal balance	$ 7,137	$ 1,714	$ 6,967
Impaired loans, recorded investment with no allowance	996	1,299	896
Impaired loans, recorded investment with allowance	5,818	223	5,818
Impaired loans, total recorded investment	6,814	1,522	6,714
Impaired loans, related allowance	2,188	11	2,223
Impaired loans, average recorded investment	6,704	1,438	3,877
Impaired loans, interest income recognized	1	1	187
Real Estate 1 [Member] | Construction and Land Development [Member]
Impaired loans, unpaid principal balance	323	439	325
Impaired loans, recorded investment with no allowance	269	400	276
Impaired loans, recorded investment with allowance
Impaired loans, total recorded investment	269	400	276
Impaired loans, related allowance
Impaired loans, average recorded investment	273	367	344
Impaired loans, interest income recognized
Real Estate 1 [Member] | Secured by Multi-family Residential Properties [Member]
Impaired loans, unpaid principal balance	556	770	568
Impaired loans, recorded investment with no allowance	430	444	449
Impaired loans, recorded investment with allowance		223
Impaired loans, total recorded investment	430	667	449
Impaired loans, related allowance		11
Impaired loans, average recorded investment	440	613	517
Impaired loans, interest income recognized		1	1
Real Estate 1 [Member] | Other Real Estate Loans [Member]
Impaired loans, unpaid principal balance	4,619	505	4,492
Impaired loans, recorded investment with no allowance	297	455	171
Impaired loans, recorded investment with allowance	4,270		4,270
Impaired loans, total recorded investment	4,567	455	4,441
Impaired loans, related allowance	2,065		2,065
Impaired loans, average recorded investment	4,443	458	2,623
Impaired loans, interest income recognized	1		109
Commercial and Industrial Loans [Member]
Impaired loans, unpaid principal balance	1,639		1,582
Impaired loans, recorded investment with no allowance
Impaired loans, recorded investment with allowance	1,548		1,548
Impaired loans, total recorded investment	1,548		1,548
Impaired loans, related allowance	123		158
Impaired loans, average recorded investment	1,548		393
Impaired loans, interest income recognized			$ 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=121611835&loc=d3e5212-111524

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-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
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-Paragraph 15
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-URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5212-111524

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- Definition

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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=121611835&loc=d3e5212-111524

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-Publisher FASB
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-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
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