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Note 4 - Allowance for Loan Losses - Impaired Loans and Related Allowances (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Impaired loans, unpaid principal balance	$ 1,639	$ 3,546
Impaired loans, recorded investment with no allowance	1,020	2,802
Impaired loans, recorded investment with allowance	439	634
Impaired loans, total recorded investment	1,459	3,436
Impaired loans, related allowance	33	243
Impaired loans, average recorded investment	1,926	3,455
Impaired loans, interest income recognized	5	85
Real Estate 1 [Member] | Construction and Land Development [Member]
Impaired loans, unpaid principal balance	401	336
Impaired loans, recorded investment with no allowance	70
Impaired loans, recorded investment with allowance	297	327
Impaired loans, total recorded investment	367	327
Impaired loans, related allowance	22	71
Impaired loans, average recorded investment	369	758
Impaired loans, interest income recognized	1	12
Real Estate 1 [Member] | Secured by Multi-family Residential Properties [Member]
Impaired loans, unpaid principal balance	729	720
Impaired loans, recorded investment with no allowance	488	356
Impaired loans, recorded investment with allowance	142	307
Impaired loans, total recorded investment	630	663
Impaired loans, related allowance	11	172
Impaired loans, average recorded investment	769	966
Impaired loans, interest income recognized	1	22
Real Estate 1 [Member] | Other Real Estate Loans [Member]
Impaired loans, unpaid principal balance	509	2,290
Impaired loans, recorded investment with no allowance	462	2,249
Impaired loans, recorded investment with allowance
Impaired loans, total recorded investment	462	2,249
Impaired loans, related allowance
Impaired loans, average recorded investment	766	1,585
Impaired loans, interest income recognized	3	51
Commercial and Industrial Loans [Member]
Impaired loans, unpaid principal balance		200
Impaired loans, recorded investment with no allowance		197
Impaired loans, recorded investment with allowance
Impaired loans, total recorded investment		197
Impaired loans, related allowance
Impaired loans, average recorded investment	22	146
Impaired loans, interest income recognized

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=118936363&loc=d3e5212-111524

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-Section 50
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-URI http://asc.fasb.org/extlink&oid=118936363&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
-Subparagraph (c)(3)
-URI http://asc.fasb.org/extlink&oid=118936363&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)
-URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953550-111524

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-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=118936363&loc=d3e5212-111524

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (a)(4)
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-Topic 310
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-Section 50
-Paragraph 14A
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