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Income Taxes - Narrative (Details) - USD ($)	6 Months Ended	12 Months Ended
	Dec. 31, 2017	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Operating Loss Carryforwards [Line Items]
Tax rate one time excluding adjustment		16.00%
Statutory tax rate		27.60%	34.00%	34.00%
Blended income tax rate		27.55%
Deferred tax benefit	$ 6,100,000	$ 5,949,389	$ 0	$ 0
Income tax rate percentage		(21.20%)	37.60%	28.00%
Unrecognized tax benefits		$ 0	$ 0	$ 0
Tax loss carryforwards from exercise of options and warrants				25,300,000
Tax benefits related to stock-based compensation		0	$ 0	$ 9,650,657
Mineral Property Depletion
Operating Loss Carryforwards [Line Items]
Tax carryforward		1,100,000
Federal
Operating Loss Carryforwards [Line Items]
Tax loss carryforward from reverse merger		1,200,000
Carryforward from reverse merger		300,000
Annual amount of carryforward from reverse merger through 2023		$ 39,648

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