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Note 7 - Indebtedness (Tables)

6 Months Ended

Sep. 30, 2020

Notes Tables

Convertible Debt [Table Text Block]

		September 30, 2020				March 31, 2020
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

		September 30, 2020				March 31, 2020
Amount allocated to conversion option		$	31,073			$	31,073
Less: allocated issuance costs and deferred taxes			(8,338	)			(8,338	)
Equity component, net		$	22,735			$	22,735

Interest Expense on Convertible Debt [Table Text Block]

		Three Months Ended September 30,								Six Months Ended September 30,
		2020				2019				2020				2019
Coupon interest expense at 1.375%		$	593			$	316			$	1,186			$	316
Amortization of debt discounts and issuance costs			1,341				707				2,667				707
Total		$	1,934			$	1,023			$	3,853			$	1,023

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