Note 7 - Loans and Allowance for Loan Losses (Details) - Individually Impaired Loans By Class of Loans, Continued (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Financing Receivable, Impaired [Line Items]
Impaired loans, average	$ 47,453	$ 61,866
Impaired loans, interest income recognized	483	487
Impaired loans, cash basis interest recognized	479	467
Real Estate Construction and Land Development [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans, average	11,124	15,623
Impaired loans, interest income recognized	81	113
Impaired loans, cash basis interest recognized	80	111
Real Estate Mortgage Residential [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans, average	10,453	11,713
Impaired loans, interest income recognized	121	115
Impaired loans, cash basis interest recognized	121	109
Real Estate Mortgage Farmland and Other Commercial Enterprises [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans, average	25,417	34,193
Impaired loans, interest income recognized	280	254
Impaired loans, cash basis interest recognized	277	244
Commercial and Industrial [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans, average	435	249
Impaired loans, interest income recognized	1	1
Impaired loans, cash basis interest recognized	1	0
Consumer Unsecured [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans, average	24	70
Impaired loans, interest income recognized	0	4
Impaired loans, cash basis interest recognized	0	3
Consumer Secured [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans, average		18
Impaired loans, interest income recognized		0
Impaired loans, cash basis interest recognized		$ 0

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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=35738203&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=35738203&loc=d3e5258-111524

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- 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

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- Definition

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+ References

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