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Note 7 - Indebtedness (Tables) | 9 Months Ended
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Dec. 31, 2022
Notes Tables |
Convertible Debt [Table Text Block] |
|  | December 31, 2022 |  |  | March 31, 2022 |
Principal outstanding |  | $ | 172,500 |  |  | $ | 172,500 |
Unamortized debt issuance costs |  |  | (2,456 | ) |  |  | (3,135 | )
Net carrying value |  | $ | 170,044 |  |  | $ | 169,365 |
Interest Expense on Convertible Debt [Table Text Block] |
|  | Three Months Ended December 31, |  |  | Nine Months Ended December 31, |
|  | 2022 |  |  | 2021 |  |  | 2022 |  |  | 2021 |
Coupon interest expense at 1.375% |  | $ | 593 |  |  | $ | 593 |  |  | $ | 1,779 |  |  | $ | 1,779 |
Amortization of debt discounts and issuance costs |  |  | 227 |  |  |  | 223 |  |  |  | 679 |  |  |  | 666 |
Total interest and amortization of debt issuance costs |  | $ | 820 |  |  | $ | 816 |  |  | $ | 2,458 |  |  | $ | 2,445 |

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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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