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Long-Term Reclamation Liability and Retirement Obligation Asset - Reconciliation of Aggregate Retirement Liability (Details) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Mine Reclamation and Closing Liability [Roll Forward]
Long-term reclamation liability — beginning of period	$ 7,417,680	$ 7,353,346
Additional obligations incurred	0	0
Accretion of reclamation liability	4,876	64,334
Long-term reclamation liability — end of period	$ 7,422,556	$ 7,417,680

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- Definition

Asset Retirement Obligation, Accretion Expense Accrued.

+ References

No definition available.

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- Definition

Mine Reclamation and Closing Liability [Roll Forward]

+ References

No definition available.

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X

- Definition

Amount of asset retirement obligations incurred during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 410
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849

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- Definition

Amount of a reclamation and mine closing liability that is associated with a legal obligation for the closure and reclamation of a mine including the removal of buildings, equipment, machinery and other physical remnants of mining, closure of tailings impoundments, leach pads and other mine features, and contouring, covering and revegetation of waste rock piles and other disturbed areas.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 5.Y.Q2)
-URI http://asc.fasb.org/extlink&oid=27011672&loc=d3e149879-122751

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