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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, 2018
Jun. 30, 2017
Jun. 30, 2016
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 $ 82,937,553 $ 77,957,319 $ 159,196,539
Net changes in sales prices and production costs related to future production 62,011,112 19,821,288 (120,832,747)
Changes in estimated future development costs 267,547 (1,626,833) 74,991
Sales of oil and gas produced during the period, net of production costs (29,087,710) (23,649,087) (17,079,363)
Net change due to extensions, discoveries, and improved recovery 0 0 0
Net change due to revisions in quantity estimates 888,896 (2,206,287) (18,821,014)
Net change due to sales of minerals in place 0 0 0
Development costs incurred during the period 0 2,632,547 16,327,883
Accretion of discount 11,089,455 10,086,904 21,870,650
Net change in discounted income taxes 871,540 (5,045,279) 36,598,239
Net changes in timing of production and other (10,019,979) 4,966,981 622,141
Balance, end of year $ 118,958,414 $ 82,937,553 $ 77,957,319