Note 5 - Marketable Securities - Marketable Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Amortized Cost	$ 177,983	$ 83,029
Amortized Cost	177,983	83,029
Unrealized gains	284	230
Unrealized gains	284	230
Unrealized Losses	(4)	(20)
Fair Value	178,263	83,239
Corporate Debt Securities [Member]
Amortized Cost	86,417	44,794
Amortized Cost	86,417	44,794
Unrealized gains	223	175
Unrealized gains	223	175
Unrealized Losses	(4)	(6)
Fair Value	86,636	44,963
Certificates of Deposit [Member]
Amortized Cost	14,950	15,262
Amortized Cost	14,950	15,262
Unrealized gains	10	8
Unrealized gains	10	8
Unrealized Losses	0	(1)
Fair Value	14,960	15,269
Commercial Paper, Not Included with Cash and Cash Equivalents [Member]
Amortized Cost	68,943	12,081
Amortized Cost	68,943	12,081
Unrealized gains	34	5
Unrealized gains	34	5
Unrealized Losses	0	(2)
Fair Value	68,977	12,084
Asset-Backed Securities [Member]
Amortized Cost	6,010	6,484
Amortized Cost	6,010	6,484
Unrealized gains	16	40
Unrealized gains	16	40
Unrealized Losses	0	0
Fair Value	6,026	6,524
US Treasury Securities [Member]
Amortized Cost	1,663	4,408
Amortized Cost	1,663	4,408
Unrealized gains	1	2
Unrealized gains	1	2
Unrealized Losses	0	(11)
Fair Value	$ 1,664	$ 4,399