Note 8 - Loans and Allowance for Loan Losses (Details) - Individually Impaired Loans By Class of Loans, Continued (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Real Estate
Average	$ 64,594	$ 103,933	$ 65,473	$ 102,893
Interest Income Recognized	694	786	1,387	1,662
Cash Basis Interest Recognized	700	762	1,370	1,475
Real Estate Construction And Land Development [Member]
Real Estate
Average	24,159	46,166	25,047	43,491
Interest Income Recognized	338	201	691	381
Cash Basis Interest Recognized	347	199	689	369
Real Estate Mortgage Residential [Member]
Real Estate
Average	10,836	16,449	9,569	17,658
Interest Income Recognized	87	86	172	256
Cash Basis Interest Recognized	83	93	163	254
Real Estate Mortgage Farmland And Other Commercial Enterprises [Member]
Real Estate
Average	28,209	40,761	29,692	40,934
Interest Income Recognized	236	498	484	1,001
Cash Basis Interest Recognized	236	469	478	828
Commercial And Industrial [Member]
Real Estate
Average	1,154	301	930	533
Interest Income Recognized	29	0	33	14
Cash Basis Interest Recognized	29	0	33	14
Consumer Secured [Member]
Real Estate
Average	21	70	21	88
Interest Income Recognized	1	0	1	5
Cash Basis Interest Recognized	1	0	1	5
Consumer Unsecured [Member]
Real Estate
Average	215	186	214	189
Interest Income Recognized	3	1	6	5
Cash Basis Interest Recognized	$ 4	$ 1	$ 6	$ 5