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Intangible assets (Details) - USD ($) | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Cost |  |
Finite-Lived Intangible Assets, Gross | $ 8,278,775 | $ 2,378,775
Accumulated amortization |  |
Finite-Lived Intangible Assets, Accumulated Amortization | (3,083,299) | (1,606,964)
Intangible assets, net | 5,195,476 | 771,811
Intangible Asset Management Service Agreements [Member] |  |
Cost |  |
Finite-Lived Intangible Assets, Gross | 856,356 | 856,356
Accumulated amortization |  |
Finite-Lived Intangible Assets, Accumulated Amortization | (840,839) | (750,697)
Belize Water Production And Supply Agreement [Member] |  |
Cost |  |
Finite-Lived Intangible Assets, Gross | 1,522,419 | 1,522,419
Accumulated amortization |  |
Finite-Lived Intangible Assets, Accumulated Amortization | (922,460) | (856,267)
Aerex Non Compete Agreement [Member] |  |
Cost |  |
Finite-Lived Intangible Assets, Gross | 400,000 | 0
Accumulated amortization |  |
Finite-Lived Intangible Assets, Accumulated Amortization | (73,333) | 0
Aerex Trade Name [Member] |  |
Cost |  |
Finite-Lived Intangible Assets, Gross | 1,400,000 | 0
Accumulated amortization |  |
Finite-Lived Intangible Assets, Accumulated Amortization | (85,556) | 0
Aerex Certifications Programs [Member] |  |
Cost |  |
Finite-Lived Intangible Assets, Gross | 2,000,000 | 0
Accumulated amortization |  |
Finite-Lived Intangible Assets, Accumulated Amortization | (611,111) | 0
Aerex Customer Backlog [Member] |  |
Cost |  |
Finite-Lived Intangible Assets, Gross | 100,000 | 0
Accumulated amortization |  |
Finite-Lived Intangible Assets, Accumulated Amortization | (91,667) | 0
Aerex Customer Relationships [Member] |  |
Cost |  |
Finite-Lived Intangible Assets, Gross | 2,000,000 | 0
Accumulated amortization |  |
Finite-Lived Intangible Assets, Accumulated Amortization | $ (458,333) | $ 0

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