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Note 7 - Indebtedness (Details Textual)
$ / shares in Units, $ in Thousands
Aug. 12, 2019
USD ($)
$ / shares
Jun. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Convertible Debt, Noncurrent   $ 141,604 $ 140,278
The Notes [Member]      
Debt Instrument, Interest Rate, Stated Percentage   1.375%  
The Notes [Member] | Senior Notes [Member]      
Debt Instrument, Face Amount $ 172,500    
Debt Instrument, Interest Rate, Stated Percentage 1.375%   1.375%
Debt Instrument, Convertible, Conversion Ratio Per 1,000 Principal 3.5273    
Debt Instrument, Convertible, Conversion Price (in dollars per share) | $ / shares $ 283.50    
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger 130.00%    
Debt Instrument, Convertible, Threshold Trading Days 20    
Debt Instrument, Convertible, Threshold Consecutive Trading Days 30    
Debt Instrument, Convertible, Consecutive Trading Days, Trading Price Per 1,000 Principal of Notes Less Than 98% of the Product 10    
Convertible Debt, Noncurrent $ 141,427    
Debt Instrument, Convertible, Carrying Amount of Equity Component $ 31,073 $ 31,073 $ 31,073
Debt Instrument, Term (Year) 6 years    
Debt Instrument, Unamortized Discount and Commissions Including Equity Component $ 5,175    
Third Party Offering Costs 255    
Debt Issuance Costs, Gross $ 4,452    
Debt Instrument, Interest Rate, Effective Percentage 5.50%