Note 8 - Stock-based Compensation - Stock-based Compensation Plan Expenses (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share based compensation expense	$ 78,699	$ 60,607	$ 52,617
Tax benefit related to stock-based compensation	2,754	4,383	5,054
Cost of Sales [Member]
Share based compensation expense	2,409	1,888	1,654
Research and Development Expense [Member]
Share based compensation expense	19,584	15,990	14,816
Selling, General and Administrative Expenses [Member]
Share based compensation expense	$ 56,706	$ 42,729	$ 36,147

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

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