Note 16 - Quarterly Financial Data (Unaudited)

12 Months Ended

Dec. 31, 2012

Quarterly Financial Information [Text Block]

16.           Quarterly Financial Data (Unaudited)

	Three months ended
	March 31, 2012		June 30, 2012			September 30, 2012			December 31, 2012
Revenue	$	50,484	$	58,607		$	56,508		$	48,214
Cost of revenue (1)		24,074		27,435			26,495			22,661
Gross profit		26,410		31,172			30,013			25,553
Operating expenses:
Research and development (2)		11,118		12,468			11,967			13,243
Selling, general and administrative (3)		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 income (expense) and other, 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
(1) Includes stock-based compensation expense	$	95	$	118		$	112		$	185
(2) Includes stock-based compensation expense		1,266		1,524			1,465			2,667
(3) Includes stock-based compensation expense		1,954		2,187			2,605			4,474
Total stock-based compensation expense	$	3,315	$	3,829		$	4,182		$	7,326

	Three months ended
	March 31, 2011		June 30, 2011		September 30, 2011			December 31, 2011
Revenue	$	44,468	$	51,628	$	52,962		$	47,461
Cost of revenue (1)		22,163		25,070		25,148			22,544
Gross profit		22,305		26,558		27,814			24,917
Operating expenses:
Research and development (2)		10,086		11,237		11,792			11,403
Selling, general and administrative (3)		9,490		10,343		10,249			10,198
Litigation expense		813		939		722			905
Total operating expenses		20,389		22,519		22,763			22,506
Income from operations		1,916		4,039		5,051			2,411
Interest income and other, net		183		24		3			99
Income before income taxes		2,099		4,063		5,054			2,510
Income tax provision (benefit)		206		581		(419	)		57
Net income	$	1,893	$	3,482	$	5,473		$	2,453
Basic net income per share	$	0.05	$	0.10	$	0.16		$	0.07
Diluted net income per share	$	0.05	$	0.10	$	0.16		$	0.07
Weighted average common shares outstanding:
Basic		35,024		33,846		33,594			33,759
Diluted		36,105		34,903		34,240			34,374
(1) Includes stock-based compensation expense	$	63	$	89	$	83		$	77
(2) Includes stock-based compensation expense		1,427		1,550		1,576			1,356
(3) Includes stock-based compensation expense		1,497		2,036		1,715			1,657
Total stock-based compensation expense	$	2,987	$	3,675	$	3,374		$	3,090