Note 3 - Loans and Allowance for Loan Losses (Detail) - Recorded Investment In Loans At The Dates Indicated: (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012
Deferred Loan Fees	$ (2,451)	$ (2,590)
Accrued Interest Receivable	3,680	4,120
Recorded Investment In Loans	1,127,729	1,103,478	1,050,049
Commercial Portfolio Segment [Member]
Gross Loan Balance	395,640	383,641
Deferred Loan Fees	(687)	(814)
Accrued Interest Receivable	958	1,078
Recorded Investment In Loans	395,911	383,905
Real Estate Mortgage [Member]
Gross Loan Balance	714,587	702,051
Deferred Loan Fees	(1,574)	(1,595)
Accrued Interest Receivable	2,020	2,024
Recorded Investment In Loans	715,033	702,480
Real Estate Construction [Member]
Gross Loan Balance	10,132	9,704
Deferred Loan Fees	(37)	(30)
Accrued Interest Receivable	17	18
Recorded Investment In Loans	10,112	9,692
Consumer And Other [Member]
Gross Loan Balance	6,808	7,531
Deferred Loan Fees	(153)	(151)
Accrued Interest Receivable	18	21
Recorded Investment In Loans	6,673	7,401
Recorded Investment [Member]
Gross Loan Balance	1,127,167	1,102,927
Deferred Loan Fees	(2,451)	(2,590)
Accrued Interest Receivable	3,013	3,141
Recorded Investment In Loans	$ 1,127,729	$ 1,103,478