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Note 3 - Fair Value Measurements - Fair Value and Carrying Value of the Notes (Details) - Senior Notes [Member] - USD ($) $ in Thousands | Jun. 30, 2025 | Mar. 31, 2025
--- | --- | ---
Reported Value Measurement [Member] |  |
Notes | $ 97,432 | $ 97,297
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Notes | $ 96,708 | $ 95,063

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