Note 11 - Share-based Compensation (Tables)

6 Months Ended

Jun. 30, 2019

Notes Tables

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

	Three months ended				Six months ended
	June 30,				June 30,
	2018		2019		2018			2019
	(Unaudited)		(Unaudited)		(Unaudited)			(Unaudited)
Research and development		978		220		5,851			376
General and administrative		14		696		(658	)		911
Total		992		916		5,193			1,287