Note 8 - Loans and Allowance for Loan Losses (Detail) - Activity In The Allowance For Loan Losses (USD $) In Thousands, unless otherwise specified	3 Months Ended						3 Months Ended						3 Months Ended						3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012 Real Estate Loans [Member] Beginning [Member]	Dec. 31, 2011 Real Estate Loans [Member] Beginning [Member]	Mar. 31, 2013 Real Estate Loans [Member] Ending [Member]	Mar. 31, 2012 Real Estate Loans [Member] Ending [Member]	Mar. 31, 2013 Real Estate Loans [Member]	Mar. 31, 2012 Real Estate Loans [Member]	Dec. 31, 2012 Commercial Portfolio Segment [Member] Beginning [Member]	Dec. 31, 2011 Commercial Portfolio Segment [Member] Beginning [Member]	Mar. 31, 2013 Commercial Portfolio Segment [Member] Ending [Member]	Mar. 31, 2012 Commercial Portfolio Segment [Member] Ending [Member]	Mar. 31, 2013 Commercial Portfolio Segment [Member]	Mar. 31, 2012 Commercial Portfolio Segment [Member]	Dec. 31, 2012 Consumer Portfolio Segment [Member] Beginning [Member]	Dec. 31, 2011 Consumer Portfolio Segment [Member] Beginning [Member]	Mar. 31, 2013 Consumer Portfolio Segment [Member] Ending [Member]	Mar. 31, 2012 Consumer Portfolio Segment [Member] Ending [Member]	Mar. 31, 2013 Consumer Portfolio Segment [Member]	Mar. 31, 2012 Consumer Portfolio Segment [Member]	Dec. 31, 2012 Beginning [Member]	Dec. 31, 2011 Beginning [Member]	Mar. 31, 2013 Ending [Member]	Mar. 31, 2012 Ending [Member]
Balance, beginning of year			$ 22,254	$ 23,538	$ 21,402	$ 23,990	$ 22,254		$ 1,513	$ 3,508	$ 1,558	$ 2,238	$ 1,513		$ 678	$ 1,218	$ 603	$ 825	$ 678		$ 24,445	$ 28,264	$ 23,563	$ 27,053
Provision for loan losses	(632)	977					(652)	2,593					(7)	(1,296)					27	(320)
Recoveries	255	282					136	127					83	99					36	56
Loans charged off	(505)	(2,470)					(336)	(2,268)					(31)	(73)					(138)	(129)
Balance, end of year			$ 22,254	$ 23,538	$ 21,402	$ 23,990	$ 21,402		$ 1,513	$ 3,508	$ 1,558	$ 2,238	$ 1,558		$ 678	$ 1,218	$ 603	$ 825	$ 603		$ 24,445	$ 28,264	$ 23,563	$ 27,053