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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
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