Note 19 - Quarterly Financial Data (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2019

Notes Tables

Quarterly Financial Information [Table Text Block]

	Three Months Ended
	December 31, 2019		September 30, 2019		June 30, 2019		March 31, 2019
	(in thousands, except per share amounts)
Revenue	$	166,738	$	168,813	$	151,007	$	141,363
Cost of revenue		74,802		75,655		67,782		63,357
Gross profit		91,936		93,158		83,225		78,006
Operating expenses:
Research and development		27,011		27,742		27,545		25,458
Selling, general and administrative		33,240		34,692		35,058		30,553
Litigation expense		991		692		503		278
Total operating expenses		61,242		63,126		63,106		56,289
Income from operations		30,694		30,032		20,119		21,717
Interest and other income, net		2,731		2,257		2,229		3,341
Income before income taxes		33,425		32,289		22,348		25,058
Income tax expense (benefit)		989		2,761		1,655		(1,123	)
Net income	$	32,436	$	29,528	$	20,693	$	26,181
Net income per share:
Basic	$	0.75	$	0.68	$	0.48	$	0.61
Diluted	$	0.70	$	0.64	$	0.45	$	0.58
Weighted-average shares outstanding:
Basic		43,496		43,308		43,109		42,749
Diluted		46,503		45,833		45,483		45,232

	Three Months Ended
	December 31, 2018			September 30, 2018		June 30, 2018		March 31, 2018
	(in thousands, except per share amounts)
Revenue	$	153,497		$	159,975	$	139,761	$	129,150
Cost of revenue		68,904			70,957		62,197		57,655
Gross profit		84,593			89,018		77,564		71,495
Operating expenses:
Research and development		22,735			25,630		23,481		21,609
Selling, general and administrative		28,372			29,552		28,561		27,318
Litigation expense		409			343		640		531
Total operating expenses		51,516			55,525		52,682		49,458
Income from operations		33,077			33,493		24,882		22,037
Interest and other income (expense), net		(393	)		2,714		2,232		440
Income before income taxes		32,684			36,207		27,114		22,477
Income tax expense		5,046			4,639		2,908		621
Net income	$	27,638		$	31,568	$	24,206	$	21,856
Net income per share:
Basic	$	0.65		$	0.75	$	0.57	$	0.52
Diluted	$	0.61		$	0.71	$	0.55	$	0.49
Weighted-average shares outstanding:
Basic		42,467			42,362		42,237		41,922
Diluted		45,058			44,669		44,400		44,282