Note 3 - Stock-based Compensation - Stock-based Compensation Plan Expenses (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Share based compensation expense		$ 32,126	$ 21,044	$ 60,710	$ 39,606
Tax benefit related to stock-based compensation	[1]	381	468	811	938
Cost of Sales [Member]
Share based compensation expense		885	642	1,700	1,199
Research and Development Expense [Member]
Share based compensation expense		6,752	4,962	12,918	9,332
Selling, General and Administrative Expenses [Member]
Share based compensation expense		$ 24,489	$ 15,440	$ 46,092	$ 29,075

[1] Amount reflects the tax benefit related to stock-based compensation recorded for equity awards that are expected to generate tax deductions when they vest in future periods.