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Note 6 - Loans and Allowance for Loan Losses - Number of Loans Modified Troubled Debt Restructuring by Loan Portfolio (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]
Number of Loans | Security Loan	3	3
Pre-Modification Oustanding Principal Balance	$ 2,220	$ 2,220
Post-Modification Principal Balance	$ 1,659	$ 1,698
Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member]
Number of Loans | Security Loan	4	4
Pre-Modification Oustanding Principal Balance	$ 200	$ 200
Post-Modification Principal Balance	$ 102	$ 103
Real Estate [Member] | Secured by Non-farm, Non-residential Properties [Member]
Number of Loans | Security Loan	2	2
Pre-Modification Oustanding Principal Balance	$ 113	$ 113
Post-Modification Principal Balance	$ 49	$ 52
Commercial and Industrial Loans [Member]
Number of Loans | Security Loan	2	2
Pre-Modification Oustanding Principal Balance	$ 116	$ 116
Post-Modification Principal Balance	$ 94	$ 94
Number of Loans | Security Loan	11	11
Pre-Modification Oustanding Principal Balance	$ 2,649	$ 2,649
Post-Modification Principal Balance	$ 1,904	$ 1,947

X

- Definition

Number of financing receivables that have been modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953676-111524

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- Definition

Post-modification amount of investment in financing receivables modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953676-111524

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- Definition

Pre-modification amount of investment in financing receivables modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953676-111524

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