Note 9 - Cash, Cash Equivalents, Investments and Restricted Cash - Restricted Cash (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021	Jun. 30, 2021	Dec. 31, 2020
Cash and cash equivalents	$ 342,867	$ 189,265
Restricted cash included in other long-term assets	118	124
Total cash, cash equivalents and restricted cash reported on the Consolidated Statements of Cash Flows	$ 342,985	$ 189,389	$ 220,332	$ 335,071