Note 10 - Share-based Compensation - Stock Compensation Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Stock compensation expense	$ 13,956	$ 5,981	$ 3,043
Research and Development Expense [Member]
Stock compensation expense	1,906	1,012	571
Selling and Marketing Expense [Member]
Stock compensation expense	1,788	852	711
General and Administrative Expense [Member]
Stock compensation expense	8,061	3,518	1,584
Cost of Sales [Member]
Stock compensation expense	$ 2,201	$ 599	$ 177