Note 7 - Loans and Allowance for Loan Losses (Details) - Individually Impaired Loans By Class Of Loans (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	$ 62,210	$ 61,331
Recorded Investment With No Allowance	26,694	24,899
Recorded Investment With Allowance	31,766	33,440
Total Recorded Investment	58,460	58,339
Allowance for Loan Losses Allocated	4,031	4,102
Real Estate Construction And Land Development [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	16,753	17,234
Recorded Investment With No Allowance	9,354	9,742
Recorded Investment With Allowance	4,612	4,699
Total Recorded Investment	13,966	14,441
Allowance for Loan Losses Allocated	929	930
Real Estate Mortgage Residential [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	11,590	11,595
Recorded Investment With No Allowance	3,729	2,871
Recorded Investment With Allowance	7,747	8,612
Total Recorded Investment	11,476	11,483
Allowance for Loan Losses Allocated	1,456	1,443
Real Estate Mortgage Farmland And Other Commercial Enterprises [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	33,534	32,102
Recorded Investment With No Allowance	13,587	12,262
Recorded Investment With Allowance	19,096	19,746
Total Recorded Investment	32,683	32,008
Allowance for Loan Losses Allocated	1,362	1,443
Commercial And Industrial [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	246	311
Recorded Investment With No Allowance	24	24
Recorded Investment With Allowance	224	293
Total Recorded Investment	248	317
Allowance for Loan Losses Allocated	200	200
Consumer Secured [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	18	18
Recorded Investment With No Allowance	0	0
Recorded Investment With Allowance	18	18
Total Recorded Investment	18	18
Allowance for Loan Losses Allocated	15	15
Consumer Unsecured [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	69	71
Recorded Investment With No Allowance	0	0
Recorded Investment With Allowance	69	72
Total Recorded Investment	69	72
Allowance for Loan Losses Allocated	$ 69	$ 71