Note 5 - Net Income Per Common Share (Detail) - Net Income (Loss) Per Common Share Computations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Net income, basic and diluted	$ 3,792	$ 3,309
Less preferred stock dividends and discount accretion	485	478
Net income available to common shareholders, basic and diluted	$ 3,307	$ 2,831
Average common shares issued and outstanding, basic and diluted (in Shares)	7,470	7,447
Net income per common share, basic and diluted (in Dollars per share)	$ 0.44	$ 0.38