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REVENUES - Additional Information (Details)
12 Months Ended
Apr. 30, 2024
USD ($)
customer
Apr. 30, 2023
USD ($)
a
customer
REVENUES    
Number of customers | customer 2 3
Customer outstanding receivables $ 0 $ 0
Revenues 51,369,000 48,676,000
Customer A    
REVENUES    
Revenues 11,554,000 7,763,000
Customer B    
REVENUES    
Revenues $ 7,200,000 6,810,000
Customer C    
REVENUES    
Revenues   $ 6,182,000
Minerals and mineral rights    
REVENUES    
Area of Land | a   147
Land sale revenue    
REVENUES    
Number of customers | customer 4 4
New Mexico | Minerals and mineral rights    
REVENUES    
Area of Land | a   55,000