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COMMITMENTS AND CONTINGENCIES - Changes in warranty reserves (Details) - USD ($)
$ in Thousands
3 Months Ended
Jul. 31, 2025
Jul. 31, 2024
Changes in warranty reserves    
Balance at beginning of period $ 259 $ 174
Warranty issued during period 49 45
Warranty expenditures during period (5) (4)
Balance at end of period $ 303 $ 215