Note 9 - Cash, Cash Equivalents, Investments and Restricted Cash - Unrealized Gains and Losses on Investments (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Amortized Cost	$ 688,064	$ 183,214
Unrealized Gains	8
Unrealized Losses	(1)	(69)
Total Fair Value	688,071	183,145
Total Fair Value	688,071	183,145
Money Market Funds [Member]
Amortized Cost	500,259	11,867
Unrealized Gains	0
Unrealized Losses	0	0
Total Fair Value	500,259	11,867
Total Fair Value	500,259	11,867
Certificates of Deposit [Member]
Amortized Cost	154,489	164,418
Unrealized Gains	0
Unrealized Losses	0	0
Total Fair Value	154,489	164,418
Total Fair Value	154,489	164,418
US Government Agencies Short-Term Debt Securities [Member]
Amortized Cost	33,241
Unrealized Gains	8
Unrealized Losses	0
Total Fair Value	33,249
Total Fair Value	33,249
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