Note 15 - Share-based Compensation - Share-based Compensation (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Total share-based compensation expense	$ 3,265	$ 2,978	$ 9,804	$ 8,939
Cost of Sales [Member]
Total share-based compensation expense	230	196	712	584
Research and Development Expense [Member]
Total share-based compensation expense	706	647	2,098	1,943
Selling and Marketing Expense [Member]
Total share-based compensation expense	298	275	884	824
General and Administrative Expense [Member]
Total share-based compensation expense	$ 2,031	$ 1,860	$ 6,110	$ 5,588