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Note 7 - Indebtedness (Tables)

6 Months Ended

Sep. 30, 2022

Notes Tables

Convertible Debt [Table Text Block]

		*September 30, 2022*				*March 31, 2022*
Principal outstanding		$	172,500			$	172,500
Unamortized debt issuance costs			(2,684	)			(3,135	)
Net carrying value		$	169,816			$	169,365

Interest Expense on Convertible Debt [Table Text Block]

		*Three Months Ended September 30,*								*Six Months Ended September 30,*
		*2022*				*2021*				*2022*				*2021*
Coupon interest expense at 1.375%		$	593			$	593			$	1,186			$	1,186
Amortization of debt discounts and issuance costs			227				222				452				443
Total interest and amortization of debt issuance costs		$	820			$	815			$	1,638			$	1,629