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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