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OIL AND NATURAL GAS PROPERTIES - Farmout Agreements (Details) - well
1 Months Ended 3 Months Ended
May 31, 2021
Mar. 31, 2021
Nov. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Mar. 31, 2022
Asset Acquisition [Line Items]            
Partnership agreement term (in years) 10 years          
Farmout Agreement | XTO Energy Inc. | San Augustine County, Texas            
Asset Acquisition [Line Items]            
Partition agreement, ownership interest in partitioned drilling units, percent   100.00%        
Farmout Agreement | Aethon Energy | San Augustine County, Texas            
Asset Acquisition [Line Items]            
Exploratory wells, expected to be drilled       5    
Exploratory wells, expected to be drilled per year       12    
Farmout Agreement | Pivotal | Angelina County, Texas            
Asset Acquisition [Line Items]            
Exploratory wells, expected to be drilled         4  
Exploratory wells, expected to be drilled per year         15  
Farmout Agreement | Second Pivotal Farmout | Angelina County, Texas            
Asset Acquisition [Line Items]            
Asset acquisition, ownership interest, in wells operated by others, percent     100.00%      
Oil, productive well, number of wells, net           10
Farmout Agreement | Second Pivotal Farmout | Angelina County, Texas | Minimum            
Asset Acquisition [Line Items]            
Asset acquisition, ownership interest, in wells operated by others, gross, percent     12.50%      
Farmout Agreement | Second Pivotal Farmout | Angelina County, Texas | Maximum            
Asset Acquisition [Line Items]            
Asset acquisition, ownership interest, in wells operated by others, gross, percent     25.00%      
Farmout Agreement | Azul-SA, LLC And Canaan Resource Partners | San Augustine County, Texas            
Asset Acquisition [Line Items]            
Oil, productive well, number of wells, net           4