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OTHER REVENUES (Details Textual)
3 Months Ended 9 Months Ended
Sep. 08, 2018
Jan. 31, 2018
USD ($)
Jul. 31, 2017
USD ($)
Jan. 31, 2019
USD ($)
a
Jan. 31, 2018
USD ($)
Sep. 07, 2018
Pre Tax Gain Included Other Revenues     $ 1,318,000 $ 0 $ 1,318,000  
Operating Leases, Income Statement, Lease Revenue   $ 57,000   $ 76,000 $ 171,000  
Area of Land | a       55,000    
Royalty InterestPercentage           1.00%
Lessor, Operating Lease, Description If 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 shall pay the Company an amount equal to the amount of such consideration paid per acre multiplied by 54,793.24.