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Note 4 - Allowance for Loan Losses - Impaired Loans and Related Allowances (Details) - USD ($) $ in Thousands	6 Months Ended		12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Impaired loans, unpaid principal balance	$ 5,982	$ 1,879	$ 1,639
Impaired loans, recorded investment with no allowance	1,263	1,198	1,020
Impaired loans, recorded investment with allowance	4,530	577	439
Impaired loans, total recorded investment	5,793	1,775	1,459
Impaired loans, related allowance	28	101	33
Impaired loans, average recorded investment	1,520	2,242	1,926
Impaired loans, interest income recognized	128	6	5
Real Estate 1 [Member] | Construction and Land Development [Member]
Impaired loans, unpaid principal balance	439	410	401
Impaired loans, recorded investment with no allowance	400	0	70
Impaired loans, recorded investment with allowance	0	391	297
Impaired loans, total recorded investment	400	391	367
Impaired loans, related allowance	0	46	22
Impaired loans, average recorded investment	383	360	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	595	941	729
Impaired loans, recorded investment with no allowance	280	715	488
Impaired loans, recorded investment with allowance	217	151	142
Impaired loans, total recorded investment	497	866	630
Impaired loans, related allowance	5	20	11
Impaired loans, average recorded investment	563	802	769
Impaired loans, interest income recognized	1	2	1
Real Estate 1 [Member] | Other Real Estate Loans [Member]
Impaired loans, unpaid principal balance	4,948	528	509
Impaired loans, recorded investment with no allowance	583	483	462
Impaired loans, recorded investment with allowance	4,313	35	0
Impaired loans, total recorded investment	4,896	518	462
Impaired loans, related allowance	23	35	0
Impaired loans, average recorded investment	574	1,035	766
Impaired loans, interest income recognized	$ 127	3	3
Commercial and Industrial Loans [Member]
Impaired loans, unpaid principal balance		0	0
Impaired loans, recorded investment with no allowance		0	0
Impaired loans, recorded investment with allowance		0	0
Impaired loans, total recorded investment		0	0
Impaired loans, related allowance		0	0
Impaired loans, average recorded investment		45	22
Impaired loans, interest income recognized		$ 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
-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
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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
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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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