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Note 6 - Indebtedness (Tables) | 6 Months Ended
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Sep. 30, 2021
Notes Tables |
Convertible Debt [Table Text Block] |
|  | September 30, 2021 |  |  | March 31, 2021 |
Principal outstanding |  | $ | 172,500 |  |  | $ | 172,500 |
Unamortized debt discount attributable to equity |  |  | - |  |  |  | (23,497 | )
Unamortized debt issuance costs |  |  | (3,583 | ) |  |  | (3,328 | )
Net carrying value |  | $ | 168,917 |  |  | $ | 145,675 |
Interest Expense on Convertible Debt [Table Text Block] |
|  | Three Months Ended September 30, |  |  | Six Months Ended September 30, |
|  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
Coupon interest expense at 1.375% |  | $ | 593 |  |  | $ | 593 |  |  | $ | 1,186 |  |  | $ | 1,186 |
Amortization of debt discounts and issuance costs |  |  | 222 |  |  |  | 1,341 |  |  |  | 443 |  |  |  | 2,667 |
Total |  | $ | 815 |  |  | $ | 1,934 |  |  | $ | 1,629 |  |  | $ | 3,853 |

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- Definition Tabular disclosure of interest expense on borrowings which can be exchanged for a specified number of another security at the option of the issuer or the holder. + References No definition available. + Details
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- Definition Tabular disclosure of convertible debt instrument. Includes, but is not limited to, principal amount and amortized premium or discount. + References No definition available. + Details
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