Note 4 - Marketable Securities - Marketable Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025
Amortized Cost	$ 144,677	$ 177,983
Unrealized gains	41	284
Unrealized Losses	(292)	(4)
Fair Value	144,426	178,263
Corporate Debt Securities [Member]
Amortized Cost	111,868	86,417
Unrealized gains	35	223
Unrealized Losses	(259)	(4)
Fair Value	111,644	86,636
Commercial Paper, Not Included with Cash and Cash Equivalents [Member]
Amortized Cost	16,843	68,943
Unrealized gains	0	34
Unrealized Losses	(19)	0
Fair Value	16,824	68,977
Certificates of Deposit [Member]
Amortized Cost	10,172	14,950
Unrealized gains	0	10
Unrealized Losses	(8)	0
Fair Value	10,164	14,960
US Treasury Securities [Member]
Amortized Cost	1,704	1,663
Unrealized gains	0	1
Unrealized Losses	(6)	0
Fair Value	1,698	1,664
Asset-Backed Securities [Member]
Amortized Cost	4,090	6,010
Unrealized gains	6	16
Unrealized Losses	0	0
Fair Value	$ 4,096	$ 6,026

Amortized cost 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

- Definition

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