Note 14 - Equity Incentive Plan - Total Stock-based Compensation Expense (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Stock-based compensation expense	$ 11,085	$ 5,386	$ 6,087
Cost of Sales [Member]
Stock-based compensation expense	716	719	412
Research and Development Expense [Member]
Stock-based compensation expense	1,233	713	424
Selling, General and Administrative Expenses [Member]
Stock-based compensation expense	$ 9,136	$ 3,954	$ 5,251

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

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