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Inventory (Details) - USD ($) | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Inventory [Line Items] |  |
Total inventory | $ 6,503,418 | $ 6,911,967
Less current portion | 1,744,445 | 2,305,879
Inventory (non-current) | 4,758,973 | 4,606,088
Water stock [Member] |  |
Inventory [Line Items] |  |
Total inventory | 28,332 | 23,905
Consumables stock [Member] |  |
Inventory [Line Items] |  |
Total inventory | 150,534 | 143,028
Spare parts stock [Member] |  |
Inventory [Line Items] |  |
Total inventory | $ 6,324,552 | $ 6,745,034

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- Definition Gross amount, as of the balance sheet date, of merchandise, goods, commodities, or supplies held for future sale or to be used in manufacturing, servicing or production process. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.6(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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