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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, 2019	Sep. 30, 2018	Dec. 31, 2018
Impaired loans, unpaid principal balance	$ 1,699	$ 3,123	$ 3,546
Impaired loans, recorded investment with no allowance	1,016	2,513	2,802
Impaired loans, recorded investment with allowance	550	494	634
Impaired loans, total recorded investment	1,566	3,007	3,436
Impaired loans, related allowance	74	107	243
Impaired loans, average recorded investment	2,056	3,634	3,455
Impaired loans, interest income recognized	5	54	85
Real Estate 1 [Member] | Construction and Land Development [Member]
Impaired loans, unpaid principal balance	403	343	336
Impaired loans, recorded investment with no allowance
Impaired loans, recorded investment with allowance	376	343	327
Impaired loans, total recorded investment	376	343	327
Impaired loans, related allowance	31	87	71
Impaired loans, average recorded investment	368	900	758
Impaired loans, interest income recognized	1	12	12
Real Estate 1 [Member] | Secured by Multi-family Residential Properties [Member]
Impaired loans, unpaid principal balance	781	511	720
Impaired loans, recorded investment with no allowance	543	287	356
Impaired loans, recorded investment with allowance	147	151	307
Impaired loans, total recorded investment	690	438	663
Impaired loans, related allowance	16	20	172
Impaired loans, average recorded investment	800	1,172	966
Impaired loans, interest income recognized	1	5	22
Real Estate 1 [Member] | Other Real Estate Loans [Member]
Impaired loans, unpaid principal balance	515	2,069	2,290
Impaired loans, recorded investment with no allowance	473	2,029	2,249
Impaired loans, recorded investment with allowance	27
Impaired loans, total recorded investment	500	2,029	2,249
Impaired loans, related allowance	27
Impaired loans, average recorded investment	858	1,433	1,585
Impaired loans, interest income recognized	3	37	51
Commercial and Industrial Loans [Member]
Impaired loans, unpaid principal balance		200	200
Impaired loans, recorded investment with no allowance		197	197
Impaired loans, recorded investment with allowance
Impaired loans, total recorded investment		197	197
Impaired loans, related allowance
Impaired loans, average recorded investment	30	129	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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 17
-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
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-URI http://asc.fasb.org/extlink&oid=118936363&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)
-URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953550-111524

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Amount of allowance for credit losses related to recorded investment.

+ References

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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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+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (a)(4)
-URI http://asc.fasb.org/extlink&oid=118936363&loc=d3e5212-111524

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-Topic 310
-SubTopic 10
-Section 50
-Paragraph 14A
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-URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953550-111524

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