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Supplemental Disclosures about Oil and Natural Gas Producing Properties (unaudited) - Roll Forward of Changes in Standardized Measure of Discount Future Cash Flows on Proved Crude Oil, Natural Gas Liquids, and Natural Gas Reserves (Details) - USD ($)
 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Changes in the standardized measure of discounted future net cash flows applicable to proved crude oil, natural gas liquids, and natural gas reserves    
Balance, beginning of year $ 118,958,414 $ 82,937,553
Net changes in sales prices and production costs related to future production 23,753,518 62,011,112
Changes in estimated future development costs 833,494 267,547
Sales of oil and gas produced during the period, net of production costs (28,962,837) (29,087,710)
Net change due to extensions, discoveries, and improved recovery 0 0
Net change due to revisions in quantity estimates 6,129,847 888,896
Net change due to sales of minerals in place 0 0
Development costs incurred during the period 2,089,139 0
Accretion of discount 14,604,387 11,089,455
Net change in discounted income taxes (2,795,183) 871,540
Net changes in timing of production and other (7,878,737) (10,019,979)
Balance, end of year $ 126,732,042 $ 118,958,414