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Note 7 - Share-based Compensation (Tables)

12 Months Ended

Dec. 31, 2017

Notes Tables

Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]

		Numbers of shares				Weighted average grant date fair value
							$
Outstanding at December 31, 2016			-				-
Granted			1,141,477				20.76
Vested			(434,615	)			22.19
Forfeited			(318,700	)			19.80
Outstanding at December 31, 2017			388,162				19.93
Expected to vest at December 31, 2017			358,162				19.93

Share-based Compensation, Stock Options, Activity [Table Text Block]

														Weighted
						Weighted								average
						average				Weighted				remaining				Average
		Numbers				exercise				average grant				contractual				intrinsic
		of options				price				date fair value				term				value
							$				$				Years				$
Outstanding at December 31, 2016			-				-
Granted			343,000				29.00				19.91
Outstanding at December 31, 2017			343,000				29.00								9.98				27
Exercisable as of December 31, 2017			-				-
Vested and expected to vest at December 31, 2017			343,000				29.00								9.98				27

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

		Year Ended December 31,
		2017
Fair value of ordinary share			34.00
Risk-free interest rate			2.28	%
Expected term (years)			5.5
Expected volatility			60	%
Expected dividend yield			0	%
Contractual life (years)			10

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

		Year Ended
		December 31,
		2017
Research and development			17,753
General and administrative			4,930
Total			22,683

X

- Definition

Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed.

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