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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% |  |  |

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