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REVENUES - Additional Information (Details)
 3 Months Ended
Jul. 31, 2022
USD ($)
customer
Jul. 31, 2021
USD ($)
customer
Property, Plant and Equipment [Line Items]    
Number of customers | customer 2 2
Customer outstanding receivables $ 0 $ 0
Revenues 11,232,000 10,507,000
Customer A    
Property, Plant and Equipment [Line Items]    
Revenues 2,360,000 4,200,000
Customer B    
Property, Plant and Equipment [Line Items]    
Revenues $ 2,341,000 $ 1,700,000
Land sale revenue    
Property, Plant and Equipment [Line Items]    
Number of customers | customer 2 3