Note 7 - Loans and Allowance for Loan Losses (Details) - Individually Impaired Loans By Class of Loans, Continued - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Financing Receivable, Impaired [Line Items]
Impaired loans, average	$ 40,675	$ 51,227	$ 44,193	$ 55,365
Impaired loans, interest income recognzied	420	557	1,424	1,540
Impiared loans, cash basis interest recognized	415	549	1,396	1,492
Real Estate Portfolio Segment [Member] \| Real Estate Construction and Land Development [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans, average	9,650	13,157	10,382	14,735
Impaired loans, interest income recognzied	49	46	265	279
Impiared loans, cash basis interest recognized	47	46	258	275
Real Estate Portfolio Segment [Member] \| Real Estate Mortgage Residential [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans, average	9,416	10,651	10,199	11,137
Impaired loans, interest income recognzied	109	150	364	412
Impiared loans, cash basis interest recognized	109	143	352	393
Real Estate Portfolio Segment [Member] \| Real Estate Mortgage Farmland and Other Commercial Enterprises [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans, average	20,999	27,014	22,931	29,141
Impaired loans, interest income recognzied	255	359	780	839
Impiared loans, cash basis interest recognized	252	358	771	816
Commercial Portfolio Segment [Member] \| Commercial and Industrial [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans, average	449	375	563	290
Impaired loans, interest income recognzied	5	2	11	6
Impiared loans, cash basis interest recognized	5	2	11	5
Consumer Portfolio Segment [Member] \| Consumer Unsecured [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans, average	161	30	118	56
Impaired loans, interest income recognzied	2	0	4	4
Impiared loans, cash basis interest recognized	$ 2	$ 0	$ 4	3
Consumer Portfolio Segment [Member] \| Consumer Secured [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans, average				6
Impaired loans, interest income recognzied				0
Impiared 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=49124121&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=49124121&loc=d3e5258-111524

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