Note 8 - Stock-based Compensation - Stock-based Compensation Plan Expenses (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share based compensation expense		$ 123,479	$ 85,551	$ 78,699
Tax benefit related to stock-based compensation	[1]	1,760	1,855	2,754
Cost of Sales [Member]
Share based compensation expense		3,543	2,592	2,409
Research and Development Expense [Member]
Share based compensation expense		26,030	20,033	19,584
Selling, General and Administrative Expenses [Member]
Share based compensation expense		$ 93,906	$ 62,926	$ 56,706

[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. Equity awards granted to the Company’s executive officers are subject to the tax deduction limitations set by Section 162(m) of the Internal Revenue Code ("IRC").