Note 9 - Cash, Cash Equivalents, Investments and Restricted Cash - Unrealized Gains and Losses on Investments (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Amortized Cost	$ 649,733	$ 183,214
Unrealized Gains	9	0
Unrealized Losses	(30)	(69)
Total Fair Value	649,712	183,145
Money Market Funds [Member]
Amortized Cost	260,303	11,867
Unrealized Gains	0	0
Unrealized Losses	0	0
Total Fair Value	260,303	11,867
Certificates of Deposit [Member]
Amortized Cost	179,117	164,418
Unrealized Gains	0	0
Unrealized Losses	0	0
Total Fair Value	179,117	164,418
Corporate Debt Securities [Member]
Amortized Cost	3,263	6,779
Unrealized Gains	0	0
Unrealized Losses	(16)	(67)
Total Fair Value	3,247	6,712
US Government Agencies Short-Term Debt Securities [Member]
Amortized Cost	206,950
Unrealized Gains	9
Unrealized Losses	(13)
Total Fair Value	206,946
Auction Rate Securities [Member]
Amortized Cost	100	150
Unrealized Gains	0	0
Unrealized Losses	(1)	(2)
Total Fair Value	$ 99	$ 148