Note 9 - Cash, Cash Equivalents, Investments and Restricted Cash - Unrealized Gains and Losses on Investments (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Amortized Cost	$ 731,373	$ 183,214
Unrealized Gains	3
Unrealized Losses	(25)	(69)
Total Fair Value	731,351	183,145
Total Fair Value	731,351	183,145
Money Market Funds [Member]
Amortized Cost	372,582	11,867
Unrealized Gains	0
Unrealized Losses	0	0
Total Fair Value	372,582	11,867
Total Fair Value	372,582	11,867
Certificates of Deposit [Member]
Amortized Cost	181,384	164,418
Unrealized Gains	0
Unrealized Losses	0	0
Total Fair Value	181,384	164,418
Total Fair Value	181,384	164,418
Corporate Debt Securities [Member]
Amortized Cost		6,779
Unrealized Losses		(67)
Total Fair Value		6,712
Total Fair Value		6,712
Auction Rate Securities [Member]
Amortized Cost	75	150
Unrealized Gains	0
Unrealized Losses	(1)	(2)
Total Fair Value	74	148
Total Fair Value	74	$ 148
US Government Agencies Short-Term Debt Securities [Member]
Amortized Cost	177,332
Unrealized Gains	3
Unrealized Losses	(24)
Total Fair Value	177,311
Total Fair Value	$ 177,311