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Note 8 - Debt - Schedule of Convertible Notes (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Less: Unamortized discount $ (17,395)   $ (17,395)   $ (20,602)
Less: Unamortized debt issuance costs (27,160)   (27,160)   (31,148)
Total 3,856,592   3,856,592    
Amortization of debt issuance costs 1,300 $ 1,400 4,000 $ 4,300  
The 2026 Notes [Member]          
Long-term Debt, Gross 575,000   575,000   575,000
Less: Unamortized discount (10,367)   (10,367)   (12,611)
Less: Unamortized debt issuance costs (283)   (283)   (344)
Total 564,350   564,350   562,045
Contractual interest expense     0 0  
Amortization of discount 756 756 2,244 1,726  
Amortization of debt issuance costs 21 21 61 47  
Total interest expense $ 777 $ 777 $ 2,305 $ 1,773  
Effective interest rate 0.50% 0.50% 0.50% 0.50%  
The 2028 Notes [Member]          
Long-term Debt, Gross $ 345,000   $ 345,000   345,000
Less: Unamortized discount (7,028)   (7,028)   (7,991)
Less: Unamortized debt issuance costs (198)   (198)   (226)
Total 337,774   337,774   336,783
Contractual interest expense 970 $ 970 2,911 $ 2,232  
Amortization of discount 325 325 963 741  
Amortization of debt issuance costs 9 9 28 21  
Total interest expense $ 1,304 $ 1,304 $ 3,902 $ 2,994  
Effective interest rate 1.50% 1.50% 1.50% 1.50%  
The 2026 Notes and the 2028 Notes [Member]          
Long-term Debt, Gross $ 920,000   $ 920,000   920,000
Less: Unamortized discount (17,395)   (17,395)   (20,602)
Less: Unamortized debt issuance costs (481)   (481)   (570)
Total 902,124   902,124   $ 898,828
Contractual interest expense 970 $ 970 2,911 $ 2,232  
Amortization of discount 1,081 1,081 3,207 2,467  
Amortization of debt issuance costs 30 30 89 68  
Total interest expense $ 2,081 $ 2,081 $ 6,207 $ 4,767