Note 16 - Quarterly Financial Data (Unaudited)

12 Months Ended

Dec. 31, 2013

Quarterly Financial Information Disclosure [Abstract]

Quarterly Financial Information [Text Block]

16. Quarterly Financial Data (Unaudited)

	Three Months Ended
	March 31, 2013			June 30, 2013			September 30, 2013			December 31, 2013
	(in thousands, except per share amounts)
Revenue	$	51,470		$	57,714		$	65,347		$	63,560
Cost of revenue		24,085			26,786			30,053			29,266
Gross profit		27,385			30,928			35,294			34,294
Operating expenses:
Research and development		12,123			12,478			12,643			12,487
Selling, general and administrative		13,258			13,793			13,891			13,683
Litigation expense (benefit), net		(301	)		(257	)		104			84
Total operating expenses		25,080			26,014			26,638			26,254
Income from operations		2,305			4,914			8,656			8,040
Interest and other income (expense), net		(10	)		218			(59	)		(57	)
Income before income taxes		2,295			5,132			8,597			7,983
Income tax provision (benefit)		(204	)		(357	)		1,187			484
Net income	$	2,499		$	5,489		$	7,410		$	7,499
Basic net income per share	$	0.07		$	0.15		$	0.20		$	0.20
Diluted net income per share	$	0.07		$	0.14		$	0.19		$	0.19
Weighted-average common shares outstanding:
Basic		36,259			37,053			37,910			38,328
Diluted		37,708			38,239			39,009			39,524

	Three Months Ended
	March 31, 2012		June 30, 2012			September 30, 2012			December 31, 2012
	(in thousands, except per share amounts)
Revenue	$	50,484	$	58,607		$	56,508		$	48,214
Cost of revenue		24,074		27,435			26,495			22,661
Gross profit		26,410		31,172			30,013			25,553
Operating expenses:
Research and development		11,118		12,468			11,967			13,243
Selling, general and administrative		11,966		12,167			11,955			13,930
Litigation expense (benefit), net		128		(244	)		(229	)		(2,600	)
Total operating expenses		23,212		24,391			23,693			24,573
Income from operations		3,198		6,781			6,320			980
Interest and other income (expense), net		106		359			156			(10	)
Income before income taxes		3,304		7,140			6,476			970
Income tax provision		309		548			555			722
Net income	$	2,995	$	6,592		$	5,921		$	248
Basic net income per share	$	0.09	$	0.19		$	0.17		$	0.01
Diluted net income per share	$	0.08	$	0.18		$	0.16		$	0.01
Weighted average common shares outstanding:
Basic		34,105		34,665			35,145			35,556
Diluted		35,538		35,997			36,438			36,763