Note 15 - Share-based Compensation (Tables)

9 Months Ended

Sep. 30, 2022

Notes Tables

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

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2022		2021		2022		2021
Research and development expenses	$	642	$	971	$	2,040	$	3,119
Selling, general and administrative expenses		1,798		4,544		6,172		14,637
	$	2,440	$	5,515	$	8,212	$	17,756