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OTHER ASSETS - Additional Information (Details) - USD ($)
3 Months Ended 6 Months Ended
Oct. 31, 2025
Oct. 31, 2024
Oct. 31, 2025
Oct. 31, 2024
OTHER ASSETS        
Depreciation expense     $ 160,000 $ 96,000
Use rights        
OTHER ASSETS        
Amortization of lease cost $ 7,000 $ 7,000 14,000 14,000
Depreciation expense $ 33,000 $ 24,000 $ 72,000 $ 48,000