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Income Taxes - Reconciliation of Statutory and Income Tax Expense (Details) - USD ($)	6 Months Ended	12 Months Ended
	Dec. 31, 2017	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Income tax provision (benefit) computed at the statutory federal rate		$ 4,459,940	$ 4,380,892	$ 11,638,588
Adjustment of deferred income liability for lower statutory federal tax rate	$ (6,100,000)	(5,949,389)	0	0
Change in valuation allowance due to newly enacted tax legislation		(111,818)	0	0
Depletion in excess of tax basis		(2,433,530)	(92,196)	(2,242,620)
State income taxes, net of federal tax benefit		718,337	522,713	196,415
Permanent differences related to stock-based compensation		(139,333)	27,884	0
Other		23,824	1,371	(21,604)
Total income tax provision		$ (3,431,969)	$ 4,840,664	$ 9,570,779
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Income tax (benefit) provision computed at the statutory federal rate		27.60%	34.00%	34.00%
Adjustment of deferred income liability for lower statutory federal tax rate		(36.80%)	0.00%	0.00%
Change in valuation allowance due to newly enacted tax legislation		(0.70%)	0.00%	0.00%
Depletion in excess of tax basis		(14.90%)	(0.70%)	(6.60%)
State income taxes, net of federal tax benefit		4.40%	4.10%	0.60%
Permanent differences related to stock-based compensation		(0.90%)	0.20%	0.00%
Other		0.10%	0.00%	(0.10%)
Income tax (benefit) provision		(21.20%)	37.60%	28.00%

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