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COMMITMENTS AND CONTINGENCIES - Narrative (Details) - USD ($)
 12 Months Ended
Apr. 30, 2025
Apr. 30, 2024
COMMITMENTS AND CONTINGENCIES    
Operating Lease, Liability, Statement of Financial Position Accounts payable and accrued expenses Accounts payable and accrued expenses
Operating Lease, Right-of-Use Asset, Statement of Financial Position Other assets Other assets
Operating lease, right-of-use assets $ 39,000 $ 67,000
Operating Lease Liability 42,000 69,000
Operating Leases, Rent Expense 58,000 $ 60,000
2026 29,000  
2027 9,000  
Present value of lease liabilities $ 36,000  
Weighted average remaining lease term of operating lease 1 year 4 months 2 days 2 years 4 months 2 days
Weighted average discount rate of operating lease 5.50% 5.50%
Comprehensive limited warranty period 1 year  
Warranty term 10 years  
Minimum    
COMMITMENTS AND CONTINGENCIES    
Non-cancelable operating lease term (in years) 2 years  
Maximum    
COMMITMENTS AND CONTINGENCIES    
Non-cancelable operating lease term (in years) 5 years  
Revolving credit facility    
COMMITMENTS AND CONTINGENCIES    
Line of credit, aggregate principal amount $ 1,812,000  
Cash collateral on deposit with municipalities $ 229,000 $ 241,000
Aggregate principal amount   $ 172,000