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Note 10 - Indebtedness - Carrying Amount of the Notes (Details) - The Notes [Member] - Senior Notes [Member] - USD ($) $ in Thousands	Mar. 31, 2021	Mar. 31, 2020	Aug. 12, 2019
Principal outstanding	$ 172,500	$ 172,500
Unamortized debt discount	(23,497)	(28,205)
Unamortized debt issuance costs	(3,328)	(4,017)
Net carrying value	145,675	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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