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OTHER REVENUES: - Additional information (Details)
12 Months Ended
Apr. 30, 2020
USD ($)
a
Apr. 30, 2019
USD ($)
Apr. 30, 2015
USD ($)
Area of Land | a 12,000    
Royalty Interest Percentage 1.00%    
Lessor, Operating Lease, Description If the lessee or any of its affiliates provides any consideration to obtain, enter into, option, extend or renew an interest in any minerals or mineral rights within Sandoval County, Bernalillo County, Santa Fe County or Valencia County in New Mexico at any time from September 2017 through September 2020, lessee is required to pay the Company an amount equal to the amount of such consideration paid per acre multiplied by 55,000.    
Deferred Revenue, Leases, Gross     $ 1,010,000
Operating Leases, Income Statement, Lease Revenue $ 0 $ 76,000  
Number of minerals and mineral rights pooled | a 1,240    
Percentage of royalty on proceeds 1.42%    
Percentage of Royalty, Post Production Costs 1.42%    
Royalty income from oil and gas production $ 608,000 $ 0  
Public Reimbursement 113,000    
Private infrastructure reimbursement covenants $ 324,000    
New Mexico [Member]      
Area of Land | a 55,000    
COLORADO      
Area of Land | a 147