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Note 4 - Fair Value Measurements - Fair Value and Carrying Value of the Notes (Details) - Senior Notes [Member] - USD ($) $ in Thousands | Dec. 31, 2024 | Mar. 31, 2024
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Reported Value Measurement [Member] |  |
Notes | $ 97,163 | $ 171,198
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Notes | $ 94,819 | $ 163,013

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