Note 8 - Cash, Cash Equivalents and Investments - Cash, Cash Equivalents, Short-term and Long-term Investments (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025	Mar. 31, 2025
Cash	$ 932,144	$ 969,628
Money market funds	130,786	129,674
Certificates of deposit	304,179	157,243
Total	1,367,158	1,256,594
Cash and cash equivalents	1,062,930	1,099,302	$ 637,354
Short-term investments	304,179	157,243
Investment within other long-term assets	49	49
Auction Rate Securities [Member]
Available-for-sale securities	$ 49	$ 49