Intangible assets (Details) (USD $)	Dec. 31, 2012	Dec. 31, 2011
Cost
Finite-Lived Intangible Assets, Gross	$ 2,678,775	$ 2,378,775
Accumulated amortization
Finite-Lived Intangible Assets, Accumulated Amortization	(1,223,760)	(876,951)
Intangible assets, net	1,455,015	1,501,824
Intangible Asset Management Service Agreement [Member]
Cost
Finite-Lived Intangible Assets, Gross	856,356	856,356
Accumulated amortization
Finite-Lived Intangible Assets, Accumulated Amortization	(428,569)	(285,452)
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	(657,691)	(591,499)
Usufruct Option [Member]
Cost
Finite-Lived Intangible Assets, Gross	300,000	0
Accumulated amortization
Finite-Lived Intangible Assets, Accumulated Amortization	$ (137,500)	$ 0