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Note 7 - Indebtedness - Interest Expense on the Notes (Details) - The Notes [Member] - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2023 | Dec. 31, 2022
Coupon interest expense at 1.375% | $ 593 | $ 593 | $ 1,779 | $ 1,779
Amortization of debt issuance costs | 231 | 227 | 692 | 679
Total interest and amortization of debt issuance costs | $ 824 | $ 820 | $ 2,471 | $ 2,458

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