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Note 6 - Indebtedness (Tables)

9 Months Ended

Dec. 31, 2021

Notes Tables

Convertible Debt [Table Text Block]

		December 31, 2021				March 31, 2021
Principal outstanding		$	172,500			$	172,500
Unamortized debt discount attributable to equity			-				(23,497	)
Unamortized debt issuance costs			(3,360	)			(3,328	)
Net carrying value		$	169,140			$	145,675

Interest Expense on Convertible Debt [Table Text Block]

		Three Months Ended December 31,								Nine Months Ended December 31,
		2021				2020				2021				2020
Coupon interest expense at 1.375%		$	593			$	593			$	1,779			$	1,779
Amortization of debt discounts and issuance costs			223				1,357				666				4,024
Total		$	816			$	1,950			$	2,445			$	5,803

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