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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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