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Note 6 - Indebtedness - Interest Expense on the Notes (Details) - The Notes [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Coupon interest expense at 1.375%	$ 593	$ 593	$ 1,186	$ 1,186
Amortization of debt discounts and issuance costs	222	1,341	443	2,667
Total	$ 815	$ 1,934	$ 1,629	$ 3,853

X

- Definition

Amount of amortization expense attributable to debt discount (premium) and debt issuance costs.

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Amount of the cost of borrowed funds accounted for as interest expense for debt.

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