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Property and Equipment, Net of Depreciation, Depletion, and Amortization - Narrative (Details)
3 Months Ended 12 Months Ended
May 07, 2021
USD ($)
Dec. 31, 2020
USD ($)
Sep. 30, 2020
USD ($)
Nov. 01, 2019
USD ($)
Dec. 31, 2020
USD ($)
Sep. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
$ / bbl
Jun. 30, 2020
USD ($)
Property, Plant and Equipment [Line Items]                
Capital expenditures             $ 600,000 $ 1,500,000
Asset retirement obligation liabilities incurred             0 40,698
Impairment of proved property   $ 15,200,000 $ 9,600,000   $ 15,200,000 $ 9,600,000 $ 24,792,079 $ 0
Natural Gas and Natural Gas Liquids                
Property, Plant and Equipment [Line Items]                
Net price per barrel (in dollars per barrel) | $ / bbl             19.81  
Barnett Shale                
Property, Plant and Equipment [Line Items]                
Non-operating working interest, percent 17.00%              
Revenue interest, percent 14.00%              
Purchase price of oil and gas assets $ 18,300,000              
Asset retirement obligation liabilities incurred $ 2,800,000              
Hamilton Dome Field                
Property, Plant and Equipment [Line Items]                
Non-operating working interest, percent       23.50%        
Revenue interest, percent       19.70%        
Purchase price of oil and gas assets       $ 9,300,000        
Asset retirement obligation liabilities incurred       $ 900,000