Note 7 - Loans and Allowance for Loan Losses (Details) - Individually Impaired Loans by Class of Loans (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	$ 51,805	$ 61,331
Recorded Investment With No Allowance	18,887	24,899
Recorded Investment With Allowance	29,994	33,440
Total Recorded Investment	48,881	58,339
Allowance for Loan Losses Allocated	3,616	4,102
Real Estate Construction And Land Development [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	15,152	17,234
Recorded Investment With No Allowance	8,297	9,742
Recorded Investment With Allowance	4,159	4,699
Total Recorded Investment	12,456	14,441
Allowance for Loan Losses Allocated	647	930
Real Estate Mortgage Residential [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	10,237	11,595
Recorded Investment With No Allowance	3,164	2,871
Recorded Investment With Allowance	6,961	8,612
Total Recorded Investment	10,125	11,483
Allowance for Loan Losses Allocated	1,370	1,443
Real Estate Mortgage Farmland And Other Commercial Enterprises [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	26,167	32,102
Recorded Investment With No Allowance	7,403	12,262
Recorded Investment With Allowance	18,648	19,746
Total Recorded Investment	26,051	32,008
Allowance for Loan Losses Allocated	1,440	1,443
Commercial And Industrial [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	222	311
Recorded Investment With No Allowance	23	24
Recorded Investment With Allowance	199	293
Total Recorded Investment	222	317
Allowance for Loan Losses Allocated	132	200
Consumer Unsecured [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	27	71
Recorded Investment With No Allowance	0	0
Recorded Investment With Allowance	27	72
Total Recorded Investment	27	72
Allowance for Loan Losses Allocated	27	71
Consumer Secured [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance		18
Recorded Investment With No Allowance		0
Recorded Investment With Allowance		18
Total Recorded Investment		18
Allowance for Loan Losses Allocated		$ 15