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Note 12 - Convertible Senior Notes - Schedule of Interest Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Amortization of debt issuance costs |  |  | $ 1,037 | $ 928
The 2024 Notes and 2026 Notes [Member] |  |  |  |
Contractual interest expense | $ 1,053 | $ 1,006 | 3,161 | 3,019
Amortization of debt issuance costs | 363 | 208 | 1,072 | 618
Total interest cost | $ 1,416 | $ 1,214 | $ 4,233 | $ 3,637
Effective interest rate | 5.30% | 5.10% | 5.30% | 5.10%

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