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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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