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Note 4 - 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, 2017 USD ($)	Dec. 31, 2016 USD ($)
Number of Loans | Security Loan	8	8
Pre-Modification Oustanding Principal Balance	$ 2,447	$ 2,447
Post-Modification Principal Balance	$ 1,736	$ 1,664
Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]
Number of Loans | Security Loan	2	2
Pre-Modification Oustanding Principal Balance	$ 1,960	$ 1,960
Post-Modification Principal Balance	$ 1,363	$ 1,286
Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member]
Number of Loans | Security Loan	3	3
Pre-Modification Oustanding Principal Balance	$ 318	$ 318
Post-Modification Principal Balance	$ 246	$ 249
Real Estate [Member] | Secured by Non-farm, Non-residential Properties [Member]
Number of Loans | Security Loan	1	1
Pre-Modification Oustanding Principal Balance	$ 53	$ 53
Post-Modification Principal Balance	$ 40	$ 41
Commercial and Industrial Loans [Member]
Number of Loans | Security Loan	2	2
Pre-Modification Oustanding Principal Balance	$ 116	$ 116
Post-Modification Principal Balance	$ 87	$ 88

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=84173941&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=84173941&loc=SL6953676-111524

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- Definition

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+ 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=84173941&loc=SL6953676-111524

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