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Note 6 - Loans and Allowance for Loan Losses - Average Net Investment Impaired Loans and Interest Income Recognized and Received on Impaired Loans (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2016	Dec. 31, 2015
Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]
Average Recorded Investment	$ 1,405	$ 1,493
Interest Income Recognized	21	44
Interest Income Received	22	46
Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member]
Average Recorded Investment	251	139
Interest Income Recognized	7	14
Interest Income Received	5	14
Real Estate [Member] | Secured by Multi-family Residential Properties [Member]
Average Recorded Investment		1,892
Interest Income Recognized
Interest Income Received
Real Estate [Member] | Secured by Non-farm, Non-residential Properties [Member]
Average Recorded Investment	562	3,329
Interest Income Recognized	16	35
Interest Income Received	16	36
Real Estate [Member]
Average Recorded Investment		264
Interest Income Recognized		26
Interest Income Received		26
Commercial and Industrial Loans [Member]
Average Recorded Investment	435
Interest Income Recognized	12
Interest Income Received	12
Average Recorded Investment	2,653	7,117
Interest Income Recognized	56	119
Interest Income Received	$ 55	$ 122

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=66008989&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=66008989&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=66008989&loc=d3e5212-111524

+ Details

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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=66008989&loc=d3e5212-111524

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