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Note 11 - Common Stock and Stock-based Compensation Plans (Tables)

9 Months Ended

Sep. 30, 2021

Notes Tables

Share-based Payment Arrangement, Option, Activity [Table Text Block]

		Number of options and SAR units (1)				Weighted average exercise price				Weighted average remaining contractual term				Aggregate intrinsic value
Outstanding as of December 31, 2020			289,069			$	22.42				3.6			$	6,673
Granted			—				—
Exercised			(158,069	)			24.47
Forfeited or expired			—				—
Outstanding as of September 30, 2021 (2)			131,000			$	19.94				2.8			$	2,978
Exercisable as of September 30, 2021 (3)			131,000			$	19.94				2.8			$	2,978

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

		Number of RSUs and PSUs				Weighted Average Grant-Date Fair Value
Unvested as of December 31, 2020			842,948			$	29.30
Granted			388,447				47.26
Vested			(471,870	)			26.72
Forfeited or expired			(60,141	)			35.49
Unvested as of September 30, 2021			699,384			$	40.49

Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]

		Nine months ended September 30,								Three months ended September 30,
		2021 (unaudited)				2020 (unaudited)				2021 (unaudited)				2020 (unaudited)
Cost of revenue		$	509			$	473			$	247			$	159
Research and development, net			5,435				5,115				2,007				1,770
Sales and marketing			1,185				1,496				400				533
General and administrative			2,378				2,986				749				1,084
Total equity-based compensation expense		$	9,507			$	10,070			$	3,403			$	3,546

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

		Nine months ended September 30								Three months ended September 30
		2021 (unaudited)				2020 (unaudited)				2021 (unaudited)				2020 (unaudited)
Expected dividend yield				0%				0%				0%				0%
Expected volatility		39%	-	60%		32%	-	60%		39%	-	60%		37%	-	60%
Risk-free interest rate		0.1%	-	1.7%		0.1%	-	1.9%		0.1%	-	1.3%		0.1%	-	1.8%
Contractual term of up to (months)				24				24				24				24

X

- Definition

Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement.

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Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year.

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Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value.

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