Note 3 - Stock-based Compensation - Stock-based Compensation Plan Expenses (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Share based compensation expense	$ 21,300	$ 14,843	$ 60,019	$ 45,765
Tax benefit related to stock-based compensation	595	764	2,139	2,723
Cost of Sales [Member]
Share based compensation expense	641	471	1,834	1,384
Research and Development Expense [Member]
Share based compensation expense	4,960	3,979	14,801	12,168
Selling, General and Administrative Expenses [Member]
Share based compensation expense	$ 15,699	$ 10,393	$ 43,384	$ 32,213

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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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