Note 3 - Stock-based Compensation (Tables)

6 Months Ended

Jun. 30, 2022

Notes Tables

Share-Based Payment Arrangement, Cost by Plan [Table Text Block]

	Three Months Ended June 30,				Six Months Ended June 30,
	2022		2021		2022		2021
Cost of revenue	$	1,198	$	885	$	2,505	$	1,700
Research and development		9,187		6,752		17,588		12,918
Selling, general and administrative		32,530		24,489		62,633		46,092
Total stock-based compensation expense	$	42,915	$	32,126	$	82,726	$	60,710
Tax benefit related to stock-based compensation (1)	$	652	$	381	$	1,225	$	811

Share-Based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block]

	Time-Based RSUs					PSUs and MPSUs					MSUs					Total
	Number of Shares			Weighted- Average Grant Date Fair Value Per Share		Number of Shares			Weighted- Average Grant Date Fair Value Per Share		Number of Shares			Weighted- Average Grant Date Fair Value Per Share		Number of Shares			Weighted- Average Grant Date Fair Value Per Share
Outstanding at January 1, 2022		125		$	235.82		1,166		$	222.78		1,218		$	44.59		2,509		$	136.87
Granted		40		$	394.57		442	(1)	$	370.19		120		$	270.15		602		$	351.88
Vested		(43	)	$	183.18		(319	)	$	143.36		(162	)	$	23.57		(524	)	$	109.63
Forfeited		(4	)	$	297.83		-		$	-		(5	)	$	207.45		(9	)	$	255.02
Outstanding at June 30, 2022		118		$	307.08		1,289		$	293.00		1,171		$	69.93		2,578		$	192.21

Schedule of Share-Based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions [Table Text Block]

	Six Months Ended June 30,
	2022			2021
Expected term (in years)		0.5			0.5
Expected volatility		38.1	%		43.3	%
Risk-free interest rate		0.7	%		0.1	%
Dividend yield		0.6	%		0.6	%