Note 4 - Loans and Allowance for Loan Losses (Details) - Individually Impaired Loans by Class of Loans (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Financing Receivable, Impaired [Line Items]
Impaired loans, unpaid principal balance	$ 47,033	$ 61,331
Impaired loans, recorded investment with no allowance	15,644	24,899
Impaired loans, recorded investment with allowance	28,311	33,440
Impaired loans, total recorded investment	43,955	58,339
Impaired loans, allowance for loan losses allocated	3,371	4,102
Impaired loans, average	53,837	63,986	87,451
Impaired loans, interest income recognized	2,072	2,565	3,103
Impaired loans, cash basis interest recognized	2,037	2,475	3,043
Real Estate Construction and Land Development [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans, unpaid principal balance	13,656	17,234
Impaired loans, recorded investment with no allowance	6,902	9,742
Impaired loans, recorded investment with allowance	3,917	4,699
Impaired loans, total recorded investment	10,819	14,441
Impaired loans, allowance for loan losses allocated	744	930
Impaired loans, average	13,557	17,314	34,880
Impaired loans, interest income recognized	424	509	871
Impaired loans, cash basis interest recognized	423	461	804
Real Estate Mortgage Residential [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans, unpaid principal balance	10,256	11,595
Impaired loans, recorded investment with no allowance	3,473	2,871
Impaired loans, recorded investment with allowance	6,649	8,612
Impaired loans, total recorded investment	10,122	11,483
Impaired loans, allowance for loan losses allocated	1,172	1,443
Impaired loans, average	11,254	12,727	13,754
Impaired loans, interest income recognized	550	460	333
Impaired loans, cash basis interest recognized	535	445	324
Real Estate Mortgage Farmland and Other Commercial Enterprises [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans, unpaid principal balance	23,003	32,102
Impaired loans, recorded investment with no allowance	5,247	12,262
Impaired loans, recorded investment with allowance	17,649	19,746
Impaired loans, total recorded investment	22,896	32,008
Impaired loans, allowance for loan losses allocated	1,359	1,443
Impaired loans, average	28,711	32,785	38,077
Impaired loans, interest income recognized	1,088	1,546	1,859
Impaired loans, cash basis interest recognized	1,070	1,519	1,876
Commercial and Industrial [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans, unpaid principal balance	93	311
Impaired loans, recorded investment with no allowance	22	24
Impaired loans, recorded investment with allowance	71	293
Impaired loans, total recorded investment	93	317
Impaired loans, allowance for loan losses allocated	71	200
Impaired loans, average	255	994	403
Impaired loans, interest income recognized	6	40	17
Impaired loans, cash basis interest recognized	5	40	17
Consumer Secured [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans, unpaid principal balance	0	18
Impaired loans, recorded investment with no allowance	0	0
Impaired loans, recorded investment with allowance	0	18
Impaired loans, total recorded investment	0	18
Impaired loans, allowance for loan losses allocated	0	15
Impaired loans, average	6	19	66
Impaired loans, interest income recognized	0	1	6
Impaired loans, cash basis interest recognized	0	1	6
Consumer Unsecured [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans, unpaid principal balance	25	71
Impaired loans, recorded investment with no allowance	0	0
Impaired loans, recorded investment with allowance	25	72
Impaired loans, total recorded investment	25	72
Impaired loans, allowance for loan losses allocated	25	71
Impaired loans, average	54	147	271
Impaired loans, interest income recognized	4	9	17
Impaired loans, cash basis interest recognized	$ 4	$ 9	$ 16

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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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+ 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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