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Note 5 - Marketable Securities - Marketable Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Amortized Cost	$ 83,029	$ 128,196
Unrealized gains	230	147
Unrealized Losses	(20)	(110)
Fair Value	83,239	128,233
Corporate Debt Securities [Member]
Amortized Cost	44,794	54,256
Unrealized gains	175	74
Unrealized Losses	(6)	(49)
Fair Value	44,963	54,281
Commercial Paper, Not Included with Cash and Cash Equivalents [Member]
Amortized Cost	15,262	18,850
Unrealized gains	8	17
Unrealized Losses	(1)	(1)
Fair Value	15,269	18,866
Certificates of Deposit [Member]
Amortized Cost	12,081	28,507
Unrealized gains	5	30
Unrealized Losses	(2)	(3)
Fair Value	12,084	28,534
US Treasury Securities [Member]
Amortized Cost	6,484	10,456
Unrealized gains	40	23
Unrealized Losses	0	(7)
Fair Value	6,524	10,472
Asset-Backed Securities [Member]
Amortized Cost	4,408	16,127
Unrealized gains	2	3
Unrealized Losses	(11)	(50)
Fair Value	$ 4,399	$ 16,080

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