Note 7 - Net Income Per Share (Details) - Calculation of Earnings Per Share (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Numerator:
Net income (in Dollars)	$ 1,761	$ 4,824	$ 12,711	$ 14,107
Denominator:
Basic weighted average common shares outstanding	30,876	30,000	30,648	29,668
Dilutive effect of equity incentive plans	1,203	1,623	1,327	1,530
Diluted weighted average common shares outstanding	32,079	31,623	31,975	31,198
Net income per share:
Basic (in Dollars per share)	$ 0.06	$ 0.16	$ 0.41	$ 0.48
Diluted (in Dollars per share)	$ 0.05	$ 0.15	$ 0.40	$ 0.45