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Note 8 - Debt - Schedule of Convertible Notes (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Less: Unamortized discount | $ (21,683) |  | $ (21,683) |  | $ 0
Less: Unamortized debt issuance costs | (32,493) |  | (32,493) |  | (25,146)
Total | 3,890,323 |  | 3,890,323 |  |
Amortization of debt issuance costs | 1,400 | $ 1,100 | 4,300 | $ 3,300 |
The 2026 Notes [Member] |  |  |  |  |
Long-term Debt, Gross | 575,000 |  | 575,000 |  |
Less: Unamortized discount | (13,368) |  | (13,368) |  |
Less: Unamortized debt issuance costs | (365) |  | (365) |  |
Total | 561,267 |  | 561,267 |  |
Amortization of discount | 756 |  | 1,726 |  |
Amortization of debt issuance costs | 21 |  | 47 |  |
Total interest expense | $ 777 |  | $ 1,773 |  |
Effective interest rate | 0.50% |  | 0.50% |  |
The 2028 Notes [Member] |  |  |  |  |
Long-term Debt, Gross | $ 345,000 |  | $ 345,000 |  |
Less: Unamortized discount | (8,315) |  | (8,315) |  |
Less: Unamortized debt issuance costs | (235) |  | (235) |  |
Total | 336,450 |  | 336,450 |  |
Contractual interest expense | 970 |  | 2,232 |  |
Amortization of discount | 325 |  | 741 |  |
Amortization of debt issuance costs | 9 |  | 21 |  |
Total interest expense | $ 1,304 |  | $ 2,994 |  |
Effective interest rate | 1.50% |  | 1.50% |  |
The 2026 Notes and the 2028 Notes [Member] |  |  |  |  |
Long-term Debt, Gross | $ 920,000 |  | $ 920,000 |  | $ 0
Less: Unamortized discount | (21,683) |  | (21,683) |  |
Less: Unamortized debt issuance costs | (600) |  | (600) |  |
Total | 897,717 |  | 897,717 |  |
Contractual interest expense | 970 |  | 2,232 |  |
Amortization of discount | 1,081 |  | 2,467 |  |
Amortization of debt issuance costs | 30 |  | 68 |  |
Total interest expense | $ 2,081 |  | $ 4,767 |  |
Effective interest rate |  |  |  |  |

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