Note 5 - Net Income Per Common Share (Details) - Net Income Per Common Share Computations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Net Income Per Common Share Computations [Abstract]
Net income, basic and diluted	$ 4,074	$ 3,370
Less preferred stock dividends and discount accretion	225	537
Net income available to common shareholders, basic and diluted	$ 3,849	$ 2,833
Average common shares issued and outstanding, basic and diluted (in Shares)	7,490	7,479
Net income per common share, basic and diluted (in Dollars per share)	$ 0.51	$ 0.38