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, 2015	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2012
Standardized measure of discounted future net cash flows
Future cash inflows	$ 807,030,282	$ 1,193,515,075	$ 1,436,980,607
Future production costs and severance taxes	(309,225,333)	(475,387,931)	(510,902,614)
Future development costs	(49,691,006)	(46,154,178)	(60,742,406)
Future income tax expenses	(123,888,665)	(195,581,510)	(275,113,560)
Future net cash flows	324,225,278	476,391,456	590,222,027
10% annual discount for estimated timing of cash flows	(165,028,739)	(250,313,784)	(283,001,328)
Standardized measure of discounted future net cash flows	$ 159,196,539	$ 226,077,672	$ 307,220,699	$ 283,597,493