Note 3 - Stock-based Compensation (Tables)

9 Months Ended

Sep. 30, 2022

Notes Tables

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

	Three Months Ended September 30,				Nine Months Ended September 30,
	2022		2021		2022		2021
Cost of revenue	$	1,186	$	922	$	3,691	$	2,622
Research and development		9,287		6,646		26,875		19,564
Selling, general and administrative		32,524		24,004		95,157		70,096
Total stock-based compensation expense	$	42,997	$	31,572	$	125,723	$	92,282
Tax benefit related to stock-based compensation (1)	$	654	$	488	$	1,879	$	1,299

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		44		$	396.77		442	(1)	$	363.74		120		$	270.15		606		$	347.57
Vested		(53	)	$	188.73		(375	)	$	141.02		(243	)	$	23.57		(671	)	$	102.22
Forfeited		(6	)	$	308.76		(1	)	$	374.87		(6	)	$	216.37		(13	)	$	268.11
Outstanding at September 30, 2022		110		$	318.11		1,232		$	298.24		1,089		$	73.23		2,431		$	198.26

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

	Three Months Ended September 30,						Nine Months Ended September 30,
	2022			2021			2022			2021
Expected term (in years)		0.5			0.5			0.5			0.5
Expected volatility		63.2	%		43.0	%		50.6	%		43.2	%
Risk-free interest rate		3.1	%		0.1	%		1.9	%		0.1	%
Dividend yield		0.6	%		0.5	%		0.6	%		0.6	%