Note 7 - Net Income Per Share (Details) - Net Income Per Share Basic And Diluted (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Net Income Per Share Basic And Diluted [Abstract]
Net income (in Dollars)	$ 22,898	$ 15,756	$ 13,301
Weighted average outstanding shares used to compute basic net income per share	37,387	34,871	34,050
Effect of dilutive securities	1,233	1,376	1,110
Weighted average outstanding shares used to compute diluted net income per share	38,620	36,247	35,160
Net income per share - basic (in Dollars per share)	$ 0.61	$ 0.45	$ 0.39
Net income per share - diluted (in Dollars per share)	$ 0.59	$ 0.43	$ 0.38