Note 3 - 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, 2013	Dec. 31, 2012	Dec. 31, 2011
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	$ 61,331	$ 68,336
Recorded Investment With No Allowance	24,899	28,221
Recorded Investment With Allowance	33,440	35,668
Total Recorded Investment	58,339	63,889
Allowance for Loan Losses Allocated	4,102	5,143
Average	63,986	87,451	151,772
Interest Income Recognized	2,565	3,103	5,059
Cash Basis Interest Recognized	2,475	3,043	4,923
Real Estate Construction And Land Development [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	17,234	26,831
Recorded Investment With No Allowance	9,742	12,712
Recorded Investment With Allowance	4,699	11,068
Total Recorded Investment	14,441	23,780
Allowance for Loan Losses Allocated	930	2,075
Average	17,314	34,880	51,226
Interest Income Recognized	509	871	719
Cash Basis Interest Recognized	461	804	716
Real Estate Mortgage Residential [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	11,595	7,474
Recorded Investment With No Allowance	2,871	2,215
Recorded Investment With Allowance	8,612	5,259
Total Recorded Investment	11,483	7,474
Allowance for Loan Losses Allocated	1,443	1,069
Average	12,727	13,754	28,732
Interest Income Recognized	460	333	1,282
Cash Basis Interest Recognized	445	324	1,271
Real Estate Mortgage Farmland And Other Commercial Enterprises [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	32,102	33,491
Recorded Investment With No Allowance	12,262	13,294
Recorded Investment With Allowance	19,746	18,803
Total Recorded Investment	32,008	32,097
Allowance for Loan Losses Allocated	1,443	1,588
Average	32,785	38,077	67,565
Interest Income Recognized	1,546	1,859	2,847
Cash Basis Interest Recognized	1,519	1,876	2,768
Commercial And Industrial [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	311	210
Recorded Investment With No Allowance	24	0
Recorded Investment With Allowance	293	207
Total Recorded Investment	317	207
Allowance for Loan Losses Allocated	200	198
Average	994	403	4,174
Interest Income Recognized	40	17	205
Cash Basis Interest Recognized	40	17	164
Consumer Secured [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	18	21
Recorded Investment With No Allowance	0	0
Recorded Investment With Allowance	18	21
Total Recorded Investment	18	21
Allowance for Loan Losses Allocated	15	17
Average	19	66	66
Interest Income Recognized	1	6	6
Cash Basis Interest Recognized	1	6	4
Consumer Unsecured [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	71	309
Recorded Investment With No Allowance	0	0
Recorded Investment With Allowance	72	310
Total Recorded Investment	72	310
Allowance for Loan Losses Allocated	71	196
Average	147	271	9
Interest Income Recognized	9	17	0
Cash Basis Interest Recognized	$ 9	$ 16	$ 0