Note 15 - Share-based Compensation - Share-based Compensation (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Total share-based compensation expense	$ 3,238	$ 2,942
Cost of Sales [Member]
Total share-based compensation expense	246	188
Research and Development Expense [Member]
Total share-based compensation expense	688	640
Selling and Marketing Expense [Member]
Total share-based compensation expense	291	271
General and Administrative Expense [Member]
Total share-based compensation expense	$ 2,013	$ 1,843