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Income Taxes - Reconciliation of Statutory and Income Tax Expense (Details) - USD ($)	12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014
Income Tax Disclosure [Abstract]
Income tax provision (benefit) computed at the statutory federal rate	$ 11,638,588	$ 2,868,267	$ 1,866,366
Depletion in excess of basis	(2,242,620)	0	0
State income taxes, net of federal tax benefit	196,415	595,708	189,081
Permanent differences related to stock-based compensation	0	0	(155,817)
Other permanent differences	(21,604)	(19,754)	(7,632)
Total income tax provision	$ 9,570,779	$ 3,444,221	$ 1,891,998

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.

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