Note 9 - Stockholders' Equity and Stock-based Compensation - Summary of Stock-based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Stock-based compensation	$ 11,745	$ 38,202
Cost of Sales [Member]
Stock-based compensation	1,080	875
Research and Development Expense [Member]
Stock-based compensation	3,287	2,215
Selling and Marketing Expense [Member]
Stock-based compensation	2,031	1,628
General and Administrative Expense [Member]
Stock-based compensation	$ 5,347	$ 33,484