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Intangible assets (Details Textual) (USD $)
 1 Months Ended 12 Months Ended
Feb. 29, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Finite-Lived Intangible Assets [Line Items]        
Finite Lived Intangible Asset Amortization Period 1 year      
Payment For Nsc Option Agreement   $ 0 $ 300,000 $ 0
Option Agreement [Member]
        
Finite-Lived Intangible Assets [Line Items]        
Payment For Nsc Option Agreement $ 300,000      
Belize water production and supply agreement [Member]
        
Finite-Lived Intangible Assets [Line Items]        
Finite Lived Intangible Asset Amortization Period   23 years    
Desal Co [Member]
        
Finite-Lived Intangible Assets [Line Items]        
Business Acquisition, Percentage of Voting Interests Acquired   100.00%