Note 10 - Net Loss Per Share (Tables)

9 Months Ended

Sep. 30, 2018

Notes Tables

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]

	Three months ended September 30 ,				Nine m onths e nded September 30 ,
	201 8		201 7		201 8		201 7
Options to purchase ordinary shares		383,855		1,066,371		290,226		948,318
Unvested restricted shares		—		63,438		—		63,438
Unvested restricted share units		332,455		361,890		332,455		361,890