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COMMITMENTS AND CONTINGENCIES - Changes in warranty reserves (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Oct. 31, 2024
Oct. 31, 2023
Oct. 31, 2024
Oct. 31, 2023
Changes in warranty reserves        
Balance at beginning of period $ 215 $ 179 $ 175 $ 165
Warranty accrued during period 25 18 70 35
Warranty expenditures during period 6 3 9 6
Balance at end of period $ 234 $ 194 $ 234 $ 194