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Note 6 - Convertible Senior Notes - Convertible Debt (Details) - USD ($) $ in Thousands		Dec. 31, 2023	Dec. 31, 2022	Aug. 14, 2020
Principal amount		$ 215,924	$ 320,030
Unamortized debt issuance costs	[1]	(2,769)	(4,743)
Total convertible senior notes, net		213,155	315,287
Fair value of outstanding convertible senior notes (1)
Convertible Senior Notes 2023 [Member]
Principal amount		95,000	95,000	$ 95,000
Unamortized debt issuance costs	[1]		(619)
Total convertible senior notes, net			94,381
Fair value of outstanding convertible senior notes (1)			92,031
Convertible Senior Notes 2026 [Member]
Principal amount		215,924	225,030
Unamortized debt issuance costs	[1]	(2,769)	(4,124)
Total convertible senior notes, net		213,155	220,906
Fair value of outstanding convertible senior notes (1)		$ 131,444	$ 118,141
[1] The fair value is classified as Level 3 due to the limited trading activity for the convertible senior notes.

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