Note 12 - Equity Incentive Plan - Total Stock-based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Stock-based compensation expense	$ 3,876	$ 2,863	$ 10,502	$ 7,919
Stock-based compensation expense	3,876	2,863	10,502	7,919
Cost of Sales [Member]
Stock-based compensation expense	242	142	645	485
Stock-based compensation expense	242	142	645	485
Research and Development Expense [Member]
Stock-based compensation expense	397	360	1,267	1,003
Stock-based compensation expense	397	360	1,267	1,003
Selling, General and Administrative Expenses [Member]
Stock-based compensation expense	3,237	2,361	8,590	6,431
Stock-based compensation expense	$ 3,237	$ 2,361	$ 8,590	$ 6,431