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Note 6 - Indebtedness - Carrying Amount of the Notes (Details) - The Notes [Member] - Senior Notes [Member] - USD ($) $ in Thousands | Sep. 30, 2021 | Mar. 31, 2021
--- | --- | ---
Principal outstanding | $ 172,500 | $ 172,500
Unamortized debt discount attributable to equity | 0 | (23,497)
Unamortized debt issuance costs | (3,583) | (3,328)
Net carrying value | $ 168,917 | $ 145,675

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