Note 5 - Net Income Per Common Share (Details) - Net Income Per Common Share - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Net Income Per Common Share [Abstract]
Net income, basic and diluted	$ 6,180	$ 4,074
Less preferred stock dividends	0	225
Net income available to common shareholders, basic and diluted	$ 6,180	$ 3,849
Average common shares issued and outstanding, basic and diluted (in Shares)	7,500	7,490
Net income per common share, basic and diluted (in Dollars per share)	$ 0.82	$ 0.51