Note 8 - Share-based Compensation - Stock Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Stock compensation expense	$ 4,868	$ 1,560	$ 8,892	$ 3,818
Research and Development Expense [Member]
Stock compensation expense	551	291	1,171	687
Selling and Marketing Expense [Member]
Stock compensation expense	560	256	1,012	581
General and Administrative Expense [Member]
Stock compensation expense	3,015	868	5,662	2,144
Cost of Sales [Member]
Stock compensation expense	$ 742	$ 145	$ 1,047	$ 406

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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