Note 8 - Loans and Allowance for Loan Losses (Details) - Aging Analysis of Loans (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	$ 1,004,766	$ 1,004,995
Real Estate Construction And Land Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	6	908
90 Days Or More Past Due	699	1,361
Total	705	2,269
Current	103,061	100,185
Total Loans	103,766	102,454
Real Estate Mortgage Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	2,536	2,303
90 Days Or More Past Due	1,881	2,500
Total	4,417	4,803
Current	367,373	363,959
Total Loans	371,790	368,762
Real Estate Mortgage Farmland And Other Commercial Enterprises [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	4,998	1,990
90 Days Or More Past Due	7,477	10,724
Total	12,475	12,714
Current	409,772	412,763
Total Loans	422,247	425,477
Commercial And Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	215	108
90 Days Or More Past Due	53	53
Total	268	161
Current	47,464	46,651
Total Loans	47,732	46,812
States and Political Subdivisions [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	0	0
90 Days Or More Past Due	0	0
Total	0	0
Current	22,597	21,472
Total Loans	22,597	21,472
Lease Financing [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	0	1
90 Days Or More Past Due	41	53
Total	41	54
Current	1,590	2,561
Total Loans	1,631	2,615
Commercial Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	40	38
90 Days Or More Past Due	0	399
Total	40	437
Current	18,641	18,719
Total Loans	18,681	19,156
Consumer Secured [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	80	69
90 Days Or More Past Due	0	0
Total	80	69
Current	9,991	11,663
Total Loans	10,071	11,732
Consumer Unsecured [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	28	137
90 Days Or More Past Due	0	0
Total	28	137
Current	6,223	6,378
Total Loans	6,251	6,515
Total [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	7,903	5,554
90 Days Or More Past Due	10,151	15,090
Total	18,054	20,644
Current	986,712	984,351
Total Loans	$ 1,004,766	$ 1,004,995