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Note 6 - Indebtedness - Interest Expense on the Notes (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Term Loan [Member] |  |  |  |
Interest expense (7.2% and 8.4% as of September 30, 2025 and 2024, respectively) | $ 1,305 | $ 1,662 | $ 2,597 | $ 3,101
Amortization of debt issuance costs | 38 | 38 | 75 | 73
Total interest and amortization of debt issuance costs | 1,343 | 1,700 | 2,672 | 3,174
Coupon interest expense at 1.375% | 1,305 | 1,662 | 2,597 | 3,101
Amortization of debt issuance costs | 38 | 38 | 75 | 73
The Notes [Member] |  |  |  |
Interest expense (7.2% and 8.4% as of September 30, 2025 and 2024, respectively) | 168 | 335 | 503 | 702
Amortization of debt issuance costs | 68 | 133 | 203 | 278
Total interest and amortization of debt issuance costs | 236 | 468 | 706 | 980
Coupon interest expense at 1.375% | 168 | 335 | 503 | 702
Amortization of debt issuance costs | $ 68 | $ 133 | $ 203 | $ 278

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