Note 3 - Stock-based Compensation - Stock-based Compensation Plan Expenses (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Share based compensation expense	$ 22,709	$ 15,892	$ 38,719	$ 30,921
Tax benefit related to stock-based compensation	706	829	1,544	1,959
Cost of Sales [Member]
Share based compensation expense	663	480	1,193	913
Research and Development Expense [Member]
Share based compensation expense	5,412	4,194	9,841	8,188
Selling, General and Administrative Expenses [Member]
Share based compensation expense	$ 16,634	$ 11,218	$ 27,685	$ 21,820

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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-Name Accounting Standards Codification
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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