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

3 Months Ended

Mar. 31, 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			(4,000	)			19.59
Forfeited or expired			—				—
Outstanding as of March 31, 2022 (2)			122,000			$	20.07				2.4			$	2,510
Exercisable as of March 31, 2022 (3)			122,000			$	20.07				2.4			$	2,510

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			239,557				38.51
Vested			(163,137	)			34.48
Forfeited or expired			(33,235	)			51.34
Unvested as of March 31, 2022 (unaudited)			731,258			$	41.34

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

		Three months ended March 31,
		2022 (unaudited)				2021 (unaudited)
Cost of revenue		$	339			$	143
Research and development, net			1,995				1,685
Sales and marketing			333				418
General and administrative			722				952
Total equity-based compensation expense		$	3,389			$	3,198

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

		Three months ended March 31,
		2022 (unaudited)				2021 (unaudited)
Expected dividend yield			0	%				0	%
Expected volatility			38	%		39%	-	56	%
Risk-free interest rate			0.5	%		0.1%	-	1.7	%
Contractual term of up to (months)			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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