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Supplemental Disclosures about Oil and Natural Gas Producing Properties (unaudited) - Standardized Measure of Discounted Future Net Cash Flows Related to Proved Oil and Natural Gas Reserves (Details) - USD ($)	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014
Standardized measure of discounted future net cash flows
Future cash inflows	$ 425,094,736	$ 383,491,193	$ 807,030,282
Future production costs and severance taxes	(213,115,443)	(179,182,565)	(309,225,333)
Future development costs	(22,631,856)	(16,595,047)	(49,691,006)
Future income tax expenses	(47,055,551)	(45,713,438)	(123,888,665)
Future net cash flows	142,291,886	142,000,143	324,225,278
10% annual discount for estimated timing of cash flows	(59,354,333)	(64,042,824)	(165,028,739)
Standardized measure of discounted future net cash flows	$ 82,937,553	$ 77,957,319	$ 159,196,539	$ 226,077,672

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Amount of estimated future accumulated cash inflow from the sale of proved oil and gas reserves.

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Amount of estimated future accumulated cash outflow for costs to be incurred in developing proved oil and gas reserves.

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Amount of estimated future accumulated cash outflow for income tax, based on the future income less future expense derived from production and sale of proved oil and gas reserves.

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