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Intangible assets (Details) - USD ($)	Dec. 31, 2015	Dec. 31, 2014
Cost
Finite-Lived Intangible Assets, Gross	$ 2,378,775	$ 2,678,775
Accumulated amortization
Finite-Lived Intangible Assets, Accumulated Amortization	(1,606,964)	(1,750,875)
Intangible assets, net	771,811	927,900
Intangible Asset Management Service Agreement [Member]
Cost
Finite-Lived Intangible Assets, Gross	856,356	856,356
Accumulated amortization
Finite-Lived Intangible Assets, Accumulated Amortization	(750,697)	(660,800)
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	(856,267)	(790,075)
Option agreement [Member]
Cost
Finite-Lived Intangible Assets, Gross	0	300,000
Accumulated amortization
Finite-Lived Intangible Assets, Accumulated Amortization	$ 0	$ (300,000)

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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=26713463&loc=d3e16323-109275

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- Definition

Amount before 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)
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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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