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

6 Months Ended

Jun. 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			(153,295	)			24.79
Forfeited or expired			—				—
Outstanding as of June 30, 2021 (2)			135,774			$	19.74				2.9			$	3,742
Exercisable as of June 30, 2021 (3)			135,774			$	19.74				2.9			$	3,742

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			263,697				47.63
Vested			(407,806	)			26.08
Forfeited or expired			(42,527	)			36.35
Unvested as of June 30, 2021			656,312			$	38.22

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

		Six months ended June 30,								Three months ended June 30,
		2021 (unaudited)				2020 (unaudited)				2021 (unaudited)				2020 (unaudited)
Cost of revenue		$	262			$	314			$	119			$	156
Research and development, net			3,428				3,345				1,743				1,722
Sales and marketing			785				963				367				512
General and administrative			1,629				1,902				677				1,027
Total equity-based compensation expense		$	6,104			$	6,524			$	2,906			$	3,417

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

		Six months ended June 30
		2021 (unaudited)						2020 (unaudited)
Expected dividend yield					0%						0%
Expected volatility			39%	-	56%				32%	-	42%
Risk-free interest rate			0.1%	-	1.7%				1.5%	-	1.9%
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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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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