Note 4 - Marketable Securities - Marketable Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Amortized Cost	$ 77,885	$ 83,029
Unrealized gains	217	230
Unrealized Losses	(9)	(20)
Fair Value	78,093	83,239
Marketable Securities	78,093	83,239
Corporate Debt Securities [Member]
Amortized Cost	60,981	44,794
Unrealized gains	199	175
Unrealized Losses	(5)	(6)
Fair Value	61,175	44,963
Marketable Securities	61,175	44,963
Commercial Paper, Not Included with Cash and Cash Equivalents [Member]
Amortized Cost	9,414	12,081
Unrealized gains	2	5
Unrealized Losses	(1)	(2)
Fair Value	9,415	12,084
Marketable Securities	9,415	12,084
Certificates of Deposit [Member]
Amortized Cost	918	15,262
Unrealized gains	0	8
Unrealized Losses	0	(1)
Fair Value	918	15,269
Marketable Securities	918	15,269
US Treasury Securities [Member]
Amortized Cost	2,737	4,408
Unrealized gains	0	2
Unrealized Losses	(3)	(11)
Fair Value	2,734	4,399
Marketable Securities	2,734	4,399
Asset-Backed Securities [Member]
Amortized Cost	3,835	6,484
Unrealized gains	16	40
Unrealized Losses	0	0
Fair Value	3,851	6,524
Marketable Securities	$ 3,851	$ 6,524

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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+ Details