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Inventory (Details) - USD ($) | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Inventory [Line Items] |  |
Total inventory | $ 6,777,919 | $ 6,046,514
Less current portion | 2,232,721 | 1,583,553
Inventory (non-current) | 4,545,198 | 4,462,961
Water stock [Member] |  |
Inventory [Line Items] |  |
Total inventory | 36,837 | 28,332
Consumables stock [Member] |  |
Inventory [Line Items] |  |
Total inventory | 106,925 | 103,442
Spare parts stock [Member] |  |
Inventory [Line Items] |  |
Total inventory | $ 6,634,157 | $ 5,914,740

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