Note 8 - Loans and Allowance for Loan Losses (Details) - Loans by Class Modified as Troubled Debt Restructurings (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Financing Receivable, Modifications [Line Items]
Number of Loans			7	2
Real Estate Mortgage Farmland And Other Commercial Enterprises [Member] | TDR Identified Current Period [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	1	1	1	1
Pre-ModificationOutstanding Recorded Investment	$ 598	$ 8,796	$ 598	$ 8,796
Post-Modification Outstanding Recorded Investment	598	8,717	598	8,717
Consumer Secured [Member] | TDR Identified Current Period [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	1		2
Pre-ModificationOutstanding Recorded Investment	7		9
Post-Modification Outstanding Recorded Investment	7		9
Real Estate Mortgage Residential [Member] | TDR Identified Current Period [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans			3	1
Pre-ModificationOutstanding Recorded Investment			309	72
Post-Modification Outstanding Recorded Investment			309	72
Commercial And Industrial [Member] | TDR Identified Current Period [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans			1
Pre-ModificationOutstanding Recorded Investment			13
Post-Modification Outstanding Recorded Investment			13
TDR Identified Current Period [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	2	1	7	2
Pre-ModificationOutstanding Recorded Investment	605	8,796	929	8,868
Post-Modification Outstanding Recorded Investment	$ 605	$ 8,717	$ 929	$ 8,789