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REVENUES - Additional Information (Details)
 12 Months Ended
Apr. 30, 2022
USD ($)
ft²
a
customer
Apr. 30, 2021
USD ($)
ft²
customer
Property, Plant and Equipment [Line Items]    
Number of customers | customer 4 3
Revenues $ 62,479,000 $ 40,069,000
Percentage of royalty on proceeds 1.42%  
Percentage of Royalty, Post Production Costs 1.42%  
Customer A    
Property, Plant and Equipment [Line Items]    
Revenues $ 10,982,000 10,582,000
Customer B    
Property, Plant and Equipment [Line Items]    
Revenues 7,107,000 6,606,000
Customer C    
Property, Plant and Equipment [Line Items]    
Revenues 6,750,000 $ 4,858,000
Customer D    
Property, Plant and Equipment [Line Items]    
Revenues $ 6,445,000  
Minerals and mineral rights    
Property, Plant and Equipment [Line Items]    
Surface areas of land held | a 147  
New Mexico | Minerals and mineral rights    
Property, Plant and Equipment [Line Items]    
Surface areas of land held | a 55,000  
Retail Building | New Mexico    
Property, Plant and Equipment [Line Items]    
Area of land sold | ft² 4,338 14,000
Surface areas of land held | ft² 4,338 14,000
Warehouse and Office Buildings    
Property, Plant and Equipment [Line Items]    
Surface areas of land held | ft² 143,000 61,000