Note 7 - Net Income (Loss) Per Share (Detail) - Calculation of Earnings Per Share (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Numerator:
Net income (loss) (in Dollars)	$ 4,731	$ 3,499
Denominator:
Basic weighted-average shares outstanding	29,353	28,384
Effect of dilutive options and restricted stock	1,462	662
Diluted weighted average shares outstanding	30,815	29,046
Net income (loss) per share - Basic (in Dollars per share)	$ 0.16	$ 0.12
Net income (loss) per share - Diluted (in Dollars per share)	$ 0.15	$ 0.12