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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
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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. + Details
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- Definition Mine Reclamation and Closing Liability [Roll Forward] + References No definition available. + Details
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- 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 + Details
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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 + Details
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