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