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Intangible assets (Details) - USD ($) | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Cost |  |
Finite-Lived Intangible Assets, Gross | $ 8,278,775 | $ 8,278,775
Accumulated amortization |  |
Finite-Lived Intangible Assets, Accumulated Amortization | (4,513,341) | (3,083,299)
Intangible assets, net | 3,765,434 | 5,195,476
Intangible Asset Management Service Agreements [Member] |  |
Cost |  |
Finite-Lived Intangible Assets, Gross | 856,356 | 856,356
Accumulated amortization |  |
Finite-Lived Intangible Assets, Accumulated Amortization | (856,356) | (840,839)
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 | (988,652) | (922,460)
Aerex - Non-compete agreement |  |
Cost |  |
Finite-Lived Intangible Assets, Gross | 400,000 | 400,000
Accumulated amortization |  |
Finite-Lived Intangible Assets, Accumulated Amortization | (153,333) | (73,333)
Aerex - Trade name |  |
Cost |  |
Finite-Lived Intangible Assets, Gross | 1,400,000 | 1,400,000
Accumulated amortization |  |
Finite-Lived Intangible Assets, Accumulated Amortization | (178,889) | (85,556)
Aerex - Certifications/programs |  |
Cost |  |
Finite-Lived Intangible Assets, Gross | 2,000,000 | 2,000,000
Accumulated amortization |  |
Finite-Lived Intangible Assets, Accumulated Amortization | (1,277,778) | (611,111)
Aerex - Customer backlog |  |
Cost |  |
Finite-Lived Intangible Assets, Gross | 100,000 | 100,000
Accumulated amortization |  |
Finite-Lived Intangible Assets, Accumulated Amortization | (100,000) | (91,667)
Aerex - Customer relationships |  |
Cost |  |
Finite-Lived Intangible Assets, Gross | 2,000,000 | 2,000,000
Accumulated amortization |  |
Finite-Lived Intangible Assets, Accumulated Amortization | $ (958,333) | $ (458,333)

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- Definition Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph ((a)(1),(b)) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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