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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, 2016
Jun. 30, 2015
Jun. 30, 2014
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 $ 159,196,539 $ 226,077,672 $ 307,220,699
Net changes in sales prices and production costs related to future production (120,832,747) (88,043,095) (73,439,526)
Changes in estimated future development costs 74,991 (9,585,405) 9,848,614
Sales of oil and gas produced during the period, net of production costs (17,079,363) (18,538,016) (16,479,934)
Net change due to extensions, discoveries, and improved recovery 0 0 775,574
Net change due to revisions in quantity estimates (18,821,014) (9,391,321) (23,757,788)
Net change due to sales of minerals in place 0 0 (3,150,277)
Development costs incurred during the period 16,327,883 7,785,095 0
Accretion of discount 21,870,650 31,974,540 45,896,187
Net change in discounted income taxes 36,598,239 34,157,767 58,073,450
Net changes in timing of production and other [1] 622,141 (15,240,698) (78,909,327)
Balance, end of year $ 77,957,319 $ 159,196,539 $ 226,077,672
[1] Due to the June 2013 fluid release event in the Delhi field, the operator expressed plans to produce the Delhi field at lower production rates. The decision to produce these reserves at lower rates over a longer period of time did not materially change the total quantities expected to be recovered, but resulted in a significant reduction in the discounted value of these reserves as of June 30, 2014.