Note 7 - Loans and Allowance for Loan Losses (Details) - Loans by Class Modified as Troubled Debt Restructurings (USD $) In Thousands, unless otherwise specified	9 Months Ended		3 Months Ended	9 Months Ended	3 Months Ended	9 Months Ended			3 Months Ended	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2013 TDR Identified Current Period [Member] Real Estate Mortgage Farmland And Other Commercial Enterprises [Member]	Sep. 30, 2013 TDR Identified Current Period [Member] Real Estate Mortgage Farmland And Other Commercial Enterprises [Member]	Sep. 30, 2013 TDR Identified Current Period [Member] Consumer Secured [Member]	Sep. 30, 2013 TDR Identified Current Period [Member] Consumer Secured [Member]	Sep. 30, 2013 TDR Identified Current Period [Member] Real Estate Mortgage Residential [Member]	Sep. 30, 2013 TDR Identified Current Period [Member] Commercial And Industrial [Member]	Sep. 30, 2013 TDR Identified Current Period [Member]	Sep. 30, 2013 TDR Identified Current Period [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	0	7	1	1	1	2	3	1	2	7
Pre-Modification Outstanding Recorded Investment			$ 598	$ 598	$ 7	$ 9	$ 309	$ 13	$ 605	$ 929
Post-Modification Outstanding Recorded Investment			$ 598	$ 598	$ 7	$ 9	$ 309	$ 13	$ 605	$ 929