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Note 6 - Debt - Schedule of Convertible Debt (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Principal amount |  | $ 164,939 |
Total unsecured convertible senior notes, net |  | 189,459 |
Convertible Senior Notes 2026 [Member] |  |  |
Principal amount |  | 97,862 | $ 215,924
Unamortized debt issuance costs |  | (830) | (2,769)
Total unsecured convertible senior notes, net |  | 97,032 | 213,155
Fair value of outstanding unsecured convertible senior notes (1) | [1] | $ 66,668 | $ 131,444
[1] | The fair value is classified as Level 2 liability due to the limited trading activity for the unsecured convertible senior notes. The fair value of the 2026 Notes is determined based on quoted prices in an over-the counter market using the most recent trading information at the end of the reporting period. The value of the conversion feature of the 2026 Notes is not deemed to be significant as the current market price of our common stock is below the initial conversion price of $18.49 per share of common stock.

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