Note 3 - Stock-based Compensation - Stock-based Compensation Plan Expenses (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018
Share based compensation expense	$ 16,010	$ 15,030
Tax benefit related to stock-based compensation	838	1,131
Cost of Sales [Member]
Share based compensation expense	531	433
Research and Development Expense [Member]
Share based compensation expense	4,429	3,995
Selling, General and Administrative Expenses [Member]
Share based compensation expense	$ 11,050	$ 10,602

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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-Name Accounting Standards Codification
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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