Note 4 - Loans and Allowance for Loan Losses (Details) - Aging Analysis of Loans (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	$ 1,584	$ 5,057
90 Days Or More Past Due	5,372	11,172
Total	6,956	16,229
Current	924,987	983,654
Total Loans	931,943	999,883
Loans Past Due 90 Days or More and Still Accruing	0	444
Nonaccrual Loans	11,508	23,838
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	96,773	100,681
Total Loans	97,045	101,352
Loans Past Due 90 Days or More and Still Accruing	0	0
Nonaccrual Loans	3,744	5,821
Real Estate Mortgage Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	1,395	1,225
90 Days Or More Past Due	1,595	2,502
Total	2,990	3,727
Current	358,032	367,855
Total Loans	361,022	371,582
Loans Past Due 90 Days or More and Still Accruing	0	10
Nonaccrual Loans	3,474	5,154
Real Estate Mortgage Farmland and Other Commercial Enterprises [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	75	3,548
90 Days Or More Past Due	3,484	7,978
Total	3,559	11,526
Current	371,718	406,621
Total Loans	375,277	418,147
Loans Past Due 90 Days or More and Still Accruing	0	434
Nonaccrual Loans	4,202	12,677
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	13	53
Total	13	124
Current	47,099	47,302
Total Loans	47,112	47,426
Loans Past Due 90 Days or More and Still Accruing	0	0
Nonaccrual Loans	81	160
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	22,369	21,561
Total Loans	22,369	21,561
Loans Past Due 90 Days or More and Still Accruing	0	0
Nonaccrual Loans	0	0
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	158	861
Total Loans	158	883
Loans Past Due 90 Days or More and Still Accruing	0	0
Nonaccrual Loans	0	22
Commercial Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	40	56
90 Days Or More Past Due	7	0
Total	47	56
Current	15,500	23,784
Total Loans	15,547	23,840
Loans Past Due 90 Days or More and Still Accruing	0	0
Nonaccrual Loans	7	0
Consumer Secured [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	58	41
90 Days Or More Past Due	0	3
Total	58	44
Current	7,905	8,535
Total Loans	7,963	8,579
Loans Past Due 90 Days or More and Still Accruing	0	0
Nonaccrual Loans	0	3
Consumer Unsecured [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	16	58
90 Days Or More Past Due	1	1
Total	17	59
Current	5,433	6,454
Total Loans	5,450	6,513
Loans Past Due 90 Days or More and Still Accruing	0	0
Nonaccrual Loans	$ 0	$ 1