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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, 2020
Jun. 30, 2019
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 $ 126,732,042 $ 118,958,414
Net changes in sales prices and production costs related to future production (83,857,342) 23,753,518
Changes in estimated future development costs (4,099,792) 833,494
Sales of oil and gas produced during the period, net of production costs (16,093,794) (28,962,837)
Net change due to extensions, discoveries, and improved recovery 0 0
Net change due to revisions in quantity estimates (6,746,316) 6,129,847
Net change due to purchase of minerals in place (10,364,875) 0
Development costs incurred during the period 1,431,444 2,089,139
Accretion of discount 16,266,663 14,604,387
Net change in discounted income taxes 17,078,591 (2,795,183)
Net changes in timing of production and other 1,414,465 (7,878,737)
Balance, end of year $ 62,490,836 $ 126,732,042