Note 8 - Share-based Compensation - Stock Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Stock compensation expense	$ 5,399	$ 1,505
Research and Development Expense [Member]
Stock compensation expense	677	183
Selling and Marketing Expense [Member]
Stock compensation expense	705	184
General and Administrative Expense [Member]
Stock compensation expense	3,010	979
Cost of Sales [Member]
Stock compensation expense	$ 1,007	$ 159