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Note 4 - Loans and Allowance for Loan Losses - Average Net Investment Impaired Loans and Interest Income Recognized and Received on Impaired Loans (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Impaired loans, average recorded investment	$ 1,968	$ 2,170
Impaired loans, interest income recognized	44	88
Impaired loans, interest income received	40	84
Real Estate [Member]
Impaired loans, average recorded investment
Impaired loans, interest income recognized
Impaired loans, interest income received
Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]
Impaired loans, average recorded investment	1,183	1,381
Impaired loans, interest income recognized	1	41
Impaired loans, interest income received	1	39
Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member]
Impaired loans, average recorded investment	191	232
Impaired loans, interest income recognized	10	14
Impaired loans, interest income received	11	14
Real Estate [Member] | Secured by Multi-family Residential Properties [Member]
Impaired loans, average recorded investment
Impaired loans, interest income recognized
Impaired loans, interest income received
Real Estate [Member] | Secured by Non-farm, Non-residential Properties [Member]
Impaired loans, average recorded investment	539	557
Impaired loans, interest income recognized	27	33
Impaired loans, interest income received	25	$ 31
Commercial and Industrial Loans [Member]
Impaired loans, average recorded investment	55
Impaired loans, interest income recognized	6
Impaired loans, interest income received	$ 3

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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5258-111524

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of interest income recognized that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
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Period Type:	duration

X

- 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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)(3)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524

+ Details

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Period Type:	duration

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- Details

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Namespace Prefix:
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Balance Type:
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X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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- Details

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- Details

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- Details

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