Note 8 - Loans and Allowance for Loan Losses (Details) - Aging Analysis of Loans (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	$ 1,010,131	$ 1,004,995
Real Estate Construction And Land Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	58	908
90 Days Or More Past Due	599	1,361
Total	657	2,269
Current	106,213	100,185
Total Loans	106,870	102,454
Real Estate Mortgage Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	2,819	2,303
90 Days Or More Past Due	2,336	2,500
Total	5,155	4,803
Current	366,137	363,959
Total Loans	371,292	368,762
Real Estate Mortgage Farmland And Other Commercial Enterprises [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	1,169	1,990
90 Days Or More Past Due	10,131	10,724
Total	11,300	12,714
Current	407,390	412,763
Total Loans	418,690	425,477
Commercial And Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	0	108
90 Days Or More Past Due	53	53
Total	53	161
Current	47,380	46,651
Total Loans	47,433	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	22,849	21,472
Total Loans	22,849	21,472
Lease Financing [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	14	1
90 Days Or More Past Due	29	53
Total	43	54
Current	1,191	2,561
Total Loans	1,234	2,615
Commercial Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	93	38
90 Days Or More Past Due	0	399
Total	93	437
Current	26,234	18,719
Total Loans	26,327	19,156
Consumer Secured [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	53	69
90 Days Or More Past Due	7	0
Total	60	69
Current	8,897	11,663
Total Loans	8,957	11,732
Consumer Unsecured [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	68	137
90 Days Or More Past Due	0	0
Total	68	137
Current	6,411	6,378
Total Loans	6,479	6,515
Total [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	4,274	5,554
90 Days Or More Past Due	13,155	15,090
Total	17,429	20,644
Current	992,702	984,351
Total Loans	$ 1,010,131	$ 1,004,995