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Other affiliates (Details Textual) (USD $)
 1 Months Ended 3 Months Ended 6 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 6 Months Ended
May 31, 2010
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Jun. 30, 2011
CW-Bermuda [Member]
Jun. 30, 2012
CW-Bermuda [Member]
Mar. 31, 2012
CW-Bermuda [Member]
Jun. 30, 2012
N S C Agua [Member]
Jun. 30, 2011
N S C Agua [Member]
Jun. 30, 2012
N S C Agua [Member]
Jun. 30, 2011
N S C Agua [Member]
Dec. 31, 2011
N S C Agua [Member]
Jun. 30, 2012
Npdc Water Company Ltd. [Member]
Equity Method Investment, Ownership Percentage               40.00%   50.00%   50.00%      
Assets   $ 146,223,204 $ 153,798,352 $ 146,223,204 $ 153,798,352 $ 160,859,431     $ 137,000 $ 417,000   $ 417,000   $ 121,000  
Liabilities   13,282,783   13,282,783   30,578,075     0 108,000   108,000   367,000  
Sales Revenue, Services, Net   148,856 506,353 242,238 872,621   650,551                
Gross profit   5,405,410 5,251,205 11,353,259 10,501,761   436,507                
Seawater Reverse Osmosis Desalination Plant, Per Day Processing Capacity (Gallon) 100,000,000                            
Proceeds from Related Party Debt                   4,000,000          
General and Administrative Expenses   3,442,283 3,180,879 6,956,968 6,973,294         399,000 700,000 740,000 1,800,000    
Business Acquisition, Percentage of Voting Interests Acquired                             50.00%
Business Acquisition, Cost of Acquired Entity, Cash Paid                             7,000,000
Finite-Lived Intangible Asset, Useful Life                             25 years
Additional Prepayment Of Purchase Contract   500,000   500,000                      
Further Additional Prepayment Of Purchase Contract   $ 500,000   $ 500,000