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Note 6 - Indebtedness - Carrying Amount of the Notes (Details) - The Notes [Member] - Senior Notes [Member] - USD ($) $ in Thousands	Sep. 30, 2019	Aug. 12, 2019	Mar. 31, 2019
Principal outstanding	$ 172,500
Unamortized debt discount	(30,476)
Unamortized debt issuance costs	(4,342)
Net carrying value	137,682
Amount allocated to conversion option	31,073	$ 31,073
Less: allocated issuance costs and taxes	(9,427)
Equity component, net	$ 21,646

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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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