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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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The carrying amount of the equity component of convertible debt which may be settled in cash upon conversion, net of issuance costs attributable to the equity component.

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