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Note 7 - Indebtedness (Tables) | 9 Months Ended
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Dec. 31, 2020
Notes Tables |
Convertible Debt [Table Text Block] |
|  | December 31, 2020 |  |  | March 31, 2020 |
Principal outstanding |  | $ | 172,500 |  |  | $ | 172,500 |
Unamortized debt discount |  |  | (24,696 | ) |  |  | (28,205 | )
Unamortized debt issuance costs |  |  | (3,502 | ) |  |  | (4,017 | )
Net carrying value |  | $ | 144,302 |  |  | $ | 140,278 |
|  | December 31, 2020 |  |  | March 31, 2020 |
Amount allocated to conversion option |  | $ | 31,073 |  |  | $ | 31,073 |
Less: allocated issuance costs and deferred taxes |  |  | (8,338 | ) |  |  | (8,338 | )
Equity component, net |  | $ | 22,735 |  |  | $ | 22,735 |
Interest Expense on Convertible Debt [Table Text Block] |
|  | Three Months Ended December 31, |  |  | Nine Months Ended December 31, |
|  | 2020 |  |  | 2019 |  |  | 2020 |  |  | 2019 |
Coupon interest expense at 1.375% |  | $ | 593 |  |  | $ | 593 |  |  | $ | 1,779 |  |  | $ | 909 |
Amortization of debt discounts and issuance costs |  |  | 1,357 |  |  |  | 1,295 |  |  |  | 4,024 |  |  |  | 2,002 |
Total |  | $ | 1,950 |  |  | $ | 1,888 |  |  | $ | 5,803 |  |  | $ | 2,911 |

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- Definition Tabular disclosure of borrowings which can be exchanged for a specified number of another security at the option of the issuer or the holder. Disclosures include, but are not limited to, principal amount, amortized premium or discount, and amount of liability and equity components. + References No definition available. + Details
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