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Summary of Significant Accounting Policies - Narrative (Details)
 12 Months Ended
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Revenue Recognition - Oil and Gas    
Receivables from oil and gas sales $ 1,919,213 $ 3,168,116
Oil and natural gas properties    
Limitation on Capitalized Costs    
Period considered for computing unweighted arithmetic average of oil and natural gas prices (in months) 12 months  
Other Property and Equipment | Minimum    
Other Property and Equipment    
Expected lives of the individual assets or group of assets 3 years  
Other Property and Equipment | Maximum    
Other Property and Equipment    
Expected lives of the individual assets or group of assets 7 years  
Discount rate | Oil and natural gas properties    
Limitation on Capitalized Costs    
Discount rate for present value (as a percent) 0.10