Note 20 - Quarterly Financial Data (Unaudited)

12 Months Ended

Dec. 31, 2018

Notes to Financial Statements

Quarterly Financial Information [Text Block]

20.

 QUARTERLY FINANCIAL DATA (UNAUDITED)

	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, net		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 provision		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

	Three Months Ended
	December 31, 2017		September 30, 2017		June 30, 2017		March 31, 2017
	(in thousands, except per share amounts)
Revenue	$	129,430	$	128,939	$	112,198	$	100,362
Cost of revenue		58,269		58,083		50,773		45,520
Gross profit		71,161		70,856		61,425		54,842
Operating expenses:
Research and development		21,730		21,442		20,292		18,894
Selling, general and administrative		24,038		25,255		25,873		22,092
Litigation expense, net		340		327		290		286
Total operating expenses		46,108		47,024		46,455		41,272
Income from operations		25,053		23,832		14,970		13,570
Interest and other income, net		1,647		1,255		1,237		1,381
Income before income taxes		26,700		25,087		16,207		14,951
Income tax provision		14,629		1,445		1,193		474
Net income	$	12,071	$	23,642	$	15,014	$	14,477
Net income per share:
Basic	$	0.29	$	0.57	$	0.36	$	0.35
Diluted	$	0.27	$	0.54	$	0.35	$	0.33
Weighted-average shares outstanding:
Basic		41,574		41,458		41,323		41,047
Diluted		44,610		43,486		43,397		43,268