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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, 2024 | Dec. 31, 2023 | Dec. 31, 2024 | Dec. 31, 2023
Coupon interest expense at 1.375% | $ 335 | $ 593 | $ 1,037 | $ 1,779
Amortization of debt issuance costs | 134 | 231 | 412 | 692
Total interest and amortization of debt issuance costs | $ 469 | $ 824 | $ 1,449 | $ 2,471

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