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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, 2019	Jun. 30, 2018	Jun. 30, 2017
Standardized measure of discounted future net cash flows
Future cash inflows	$ 524,037,200	$ 521,533,765
Future production costs and severance taxes	(208,539,679)	(228,478,119)
Future development costs	(18,395,252)	(22,213,269)
Future income tax expenses	(55,881,997)	(50,810,883)
Future net cash flows	241,220,272	220,031,494
10% annual discount for estimated timing of cash flows	(114,488,230)	(101,073,080)
Standardized measure of discounted future net cash flows	$ 126,732,042	$ 118,958,414	$ 82,937,553

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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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