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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	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Average Recorded Investment	$ 2,119	$ 2,170
Interest Income Recognized	25	88
Interest Income Received	22	84
Real Estate [Member]
Average Recorded Investment
Interest Income Recognized
Interest Income Received
Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]
Average Recorded Investment	1,361	1,381
Interest Income Recognized	10	41
Interest Income Received	10	39
Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member]
Average Recorded Investment	193	232
Interest Income Recognized	4	14
Interest Income Received	5	14
Real Estate [Member] | Secured by Multi-family Residential Properties [Member]
Average Recorded Investment
Interest Income Recognized
Interest Income Received
Real Estate [Member] | Secured by Non-farm, Non-residential Properties [Member]
Average Recorded Investment	542	557
Interest Income Recognized	8	33
Interest Income Received	5	$ 31
Commercial and Industrial Loans [Member]
Average Recorded Investment	23
Interest Income Recognized	3
Interest Income Received	$ 2

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

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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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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

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