Note 7 - Loans and Allowance for Loan Losses (Details) - Aging Analysis of Loans (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	$ 3,785	$ 5,057
90 Days Or More Past Due	6,627	11,172
Total	10,412	16,229
Current	943,420	983,654
Total Loans	953,832	999,883
Real Estate Construction And Land Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	0	58
90 Days Or More Past Due	272	613
Total	272	671
Current	96,998	100,681
Total Loans	97,270	101,352
Real Estate Mortgage Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	2,090	1,225
90 Days Or More Past Due	1,999	2,502
Total	4,089	3,727
Current	357,226	367,855
Total Loans	361,315	371,582
Real Estate Mortgage Farmland And Other Commercial Enterprises [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	1,474	3,548
90 Days Or More Past Due	4,317	7,978
Total	5,791	11,526
Current	376,998	406,621
Total Loans	382,789	418,147
Commercial And Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	0	71
90 Days Or More Past Due	39	53
Total	39	124
Current	53,820	47,302
Total Loans	53,859	47,426
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	24,355	21,561
Total Loans	24,355	21,561
Lease Financing [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	0	0
90 Days Or More Past Due	0	22
Total	0	22
Current	239	861
Total Loans	239	883
Commercial Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	21	56
90 Days Or More Past Due	0	0
Total	21	56
Current	20,001	23,784
Total Loans	20,022	23,840
Consumer Secured [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	67	41
90 Days Or More Past Due	0	3
Total	67	44
Current	8,117	8,535
Total Loans	8,184	8,579
Consumer Unsecured [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	133	58
90 Days Or More Past Due	0	1
Total	133	59
Current	5,666	6,454
Total Loans	$ 5,799	$ 6,513