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Note 7 - Indebtedness - Carrying Amount of the Notes (Details) - The Notes [Member] - Senior Notes [Member] - USD ($)
$ in Thousands
Sep. 30, 2020
Mar. 31, 2020
Aug. 12, 2019
Principal outstanding $ 172,500 $ 172,500  
Unamortized debt discount (25,879) (28,205)  
Unamortized debt issuance costs (3,676) (4,017)  
Net carrying value 142,945 140,278  
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