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Note 10 - Common Stock and Stock-based Compensation Plans (Tables)

9 Months Ended

Sep. 30, 2022

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, 2021			126,000			$	20.06				2.6			$	2,921
Granted			—				—
Exercised			(17,000	)			18.08
Forfeited or expired			—				—
Outstanding as of September 30, 2022 (2)			109,000			$	20.37				2.2			$	664
Exercisable as of September 30, 2022 (3)			109,000			$	20.37				2.2			$	664

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, 2021			688,073			$	41.18
Granted			564,443				35.23
Vested			(302,425	)			37.03
Forfeited or expired			(92,343	)			44.23
Unvested as of September 30, 2022 (unaudited)			857,748			$	38.52

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

		Nine months ended September 30,								Three months ended September 30,
		2022 (unaudited)				2021 (unaudited)				2022 (unaudited)				2021 (unaudited)
Cost of revenue		$	1,076			$	509			$	393			$	247
Research and development, net			6,181				5,435				2,180				2,007
Sales and marketing			1,065				1,185				392				400
General and administrative			2,061				2,378				726				749
Total equity-based compensation expense		$	10,383			$	9,507			$	3,691			$	3,403

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
		2022 (unaudited)						2021 (unaudited)						2022 (unaudited)						2021 (unaudited)
Expected dividend yield					0	%					0	%					0	%					0	%
Expected volatility			38%	-	50	%			39%	-	60	%			40%	-	50	%			39%	-	60	%
Risk-free interest rate			0.5%	-	3.0	%			0.1%	-	1.7	%			0.8%	-	3.0	%			0.1%	-	1.3	%
Contractual term of up to (months)					00						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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