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Note 7 - Indebtedness - Carrying Amount of the Notes (Details) - The Notes [Member] - Senior Notes [Member] - USD ($) $ in Thousands | Dec. 31, 2020 | Mar. 31, 2020 | Aug. 12, 2019
--- | --- | --- | ---
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 |
Amount allocated to conversion option | 31,073 | 31,073 | $ 31,073
Less: allocated issuance costs and deferred taxes | (8,338) | (8,338) |
Equity component, net | $ 22,735 | $ 22,735 |

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