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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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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
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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

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