Note 7 - Loans and Allowance for Loan Losses (Details) - Individually Impaired Loans by Class of Loans (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Financing Receivable, Impaired [Line Items]
Impaired loans, unpaid principal balance	$ 48,457	$ 47,033
Impaired loans, recorded investment with no allowance	15,754	15,644
Impaired loans, recorded investment with allowance	29,820	28,311
Impaired loans, total recorded investment	45,574	43,955
Impaired loans, allowance for loan losses allocated	2,820	3,371
Real Estate Construction and Land Development [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans, unpaid principal balance	12,385	13,656
Impaired loans, recorded investment with no allowance	6,436	6,902
Impaired loans, recorded investment with allowance	3,284	3,917
Impaired loans, total recorded investment	9,720	10,819
Impaired loans, allowance for loan losses allocated	532	744
Real Estate Mortgage Residential [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans, unpaid principal balance	10,442	10,256
Impaired loans, recorded investment with no allowance	3,494	3,473
Impaired loans, recorded investment with allowance	6,815	6,649
Impaired loans, total recorded investment	10,309	10,122
Impaired loans, allowance for loan losses allocated	1,216	1,172
Real Estate Mortgage Farmland and Other Commercial Enterprises [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans, unpaid principal balance	25,217	23,003
Impaired loans, recorded investment with no allowance	5,497	5,247
Impaired loans, recorded investment with allowance	19,635	17,649
Impaired loans, total recorded investment	25,132	22,896
Impaired loans, allowance for loan losses allocated	986	1,359
Commercial and Industrial [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans, unpaid principal balance	391	93
Impaired loans, recorded investment with no allowance	327	22
Impaired loans, recorded investment with allowance	64	71
Impaired loans, total recorded investment	391	93
Impaired loans, allowance for loan losses allocated	64	71
Consumer Unsecured [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans, unpaid principal balance	22	25
Impaired loans, recorded investment with no allowance	0	0
Impaired loans, recorded investment with allowance	22	25
Impaired loans, total recorded investment	22	25
Impaired loans, allowance for loan losses allocated	$ 22	$ 25

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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 14A

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953550-111524

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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 15

-Subparagraph (a)(3)

-URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5212-111524

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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 15

-Subparagraph (a)(4)

-URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5212-111524

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