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Properties And Equipment - Summary of Divestitures (Details)
3 Months Ended 12 Months Ended
Jun. 30, 2021
USD ($)
a
Sep. 30, 2020
USD ($)
a
Dec. 31, 2019
USD ($)
a
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
a
Sep. 30, 2019
USD ($)
Property Plant And Equipment [Line Items]            
Sale Price       $ 988,600 $ 4,228,868 $ 19,515,735
Central Basin Platform, TX [Member]            
Property Plant And Equipment [Line Items]            
Net mineral acres | a 2,857          
Sale Price $ 300,000          
Gain/(Loss) $ 200,000          
Northwest OK [Member]            
Property Plant And Equipment [Line Items]            
Net mineral acres | a   5,925     5,925  
Sale Price   $ 800,000        
Gain/(Loss)   $ 700,000        
Eddy Country, NM [Member]            
Property Plant And Equipment [Line Items]            
Net mineral acres | a     530      
Sale Price     $ 3,400,000      
Gain/(Loss)     $ 3,300,000