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Note 1 - Organization and Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2018

Notes Tables

Schedule of Property, Plant and Equipment, Annual Depreciation Rates [Table Text Block]

		%
Computers, software and equipment		10	-	33
Office furniture and equipment		7	-	33
Leasehold improvements		10	-	25
		(the shorter of the expected lease term or useful economic life)

Schedule of Share-based Payment Award, Stock Options and Stock Appreciation Rights, Valuation Assumptions [Table Text Block]

		2016 (*
Expected dividend yield			0%
Expected volatility		38%	-	49%
Risk-free interest rate		0.5%	-	2.4%
Expected forfeiture (employees)			—
Expected forfeiture (executives)			5%
Contractual term of up to (years)			10
Suboptimal exercise multiple (employees)			—
Suboptimal exercise multiple (executives)			2.4

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

		2016					2017					2018
Expected dividend yield			0%					0%					0%
Expected volatility		29%	-	57%			28%	-	46%			35%	-	42%
Risk-free interest rate		0.3%	-	0.5%			0.5%	-	1.1%			0.7%	-	2.2%
Expected forfeiture			0%					0%					0%
Contractual term of up to (months)			24					24					24

Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]

		Year ended December 31,
		201 6				201 7				201 8
Cost of revenue		$	246			$	459			$	588
Research and development, net			2,860				3,839				5,141
Sales and marketing			922				1,428				1,587
General and administrative			2,208				2,967				3,051
Total equity-based compensation expense		$	6,236			$	8,693			$	10,367

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

		Year ended December 31,
		2016				2017				2018
Numerator :
Net income		$	13,100			$	17,028			$	574
Denominator (in thousands) :
Basic weighted-average common stock outstanding			20,850				21,771				22,034
Effect of stock-based awards			715				790				469
Diluted weighted-average common stock outstanding			21,565				22,561				22,503
Basic net income per share		$	0.63			$	0.78			$	0.03
Diluted net income per share		$	0.61			$	0.75			$	0.03

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