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Income Taxes - Reconciliation of Statutory and Income Tax Expense (Details) - USD ($)	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Income tax provision computed at the statutory federal rate	$ 4,380,892	$ 11,638,588	$ 2,868,267
Depletion in excess of basis	(92,196)	(2,242,620)	0
State income taxes, net of federal tax benefit	522,713	196,415	595,708
Permanent differences related to stock-based compensation	27,884	0	0
Other	1,371	(21,604)	(19,754)
Total income tax provision	$ 4,840,664	$ 9,570,779	$ 3,444,221
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Income tax provision computed at the statutory federal rate	34.00%	34.00%	34.00%
Depletion in excess of basis	(0.70%)	(6.60%)	0.00%
State income taxes, net of federal tax benefit	4.10%	0.60%	7.10%
Permanent differences related to stock-based compensation	0.20%	0.00%	0.00%
Other	0.00%	(0.10%)	(0.20%)
Income tax provision	37.60%	27.90%	40.90%

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

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