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Note 7 - Indebtedness (Details Textual)
$ / shares in Units, $ in Thousands
Aug. 12, 2019
USD ($)
$ / shares
Sep. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Sep. 30, 2019
Convertible Debt, Noncurrent   $ 142,945 $ 140,278  
The Notes [Member]        
Debt Instrument, Interest Rate, Stated Percentage   1.375%   1.375%
The Notes [Member] | Senior Notes [Member]        
Debt Instrument, Face Amount $ 172,500      
Debt Instrument, Interest Rate, Stated Percentage 1.375% 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%