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Other affiliates (Details Textual) (USD $)	1 Months Ended	3 Months Ended		9 Months Ended				9 Months Ended			3 Months Ended		9 Months Ended			9 Months Ended
	May 31, 2010	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Jul. 19, 2012	Dec. 31, 2011	Sep. 30, 2011 CW-Bermuda [Member]	Sep. 30, 2012 CW-Bermuda [Member]	Jun. 30, 2006 CW-Bermuda [Member]	Sep. 30, 2012 N S C Agua [Member]	Sep. 30, 2011 N S C Agua [Member]	Sep. 30, 2012 N S C Agua [Member]	Sep. 30, 2011 N S C Agua [Member]	Dec. 31, 2011 N S C Agua [Member]	Sep. 30, 2012 Npdc Water Company Ltd. [Member]
Equity Method Investment, Ownership Percentage										40.00%	50.00%		50.00%
Assets		$ 148,094,077	$ 155,588,975	$ 148,094,077	$ 155,588,975		$ 160,859,431		$ 136,000		$ 1,370,000		$ 1,370,000		$ 121,000
Liabilities		14,622,835		14,622,835			30,578,075		0		122,000		122,000		367,000
Sales Revenue, Services, Net		105,727	70,217	347,964	942,838			722,773
Gross profit		5,234,994	4,008,850	16,594,543	14,510,611			428,615
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		4,089,575	3,031,951	11,052,833	10,005,245						482,000	191,000	1,200,000	1,900,000
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
Further Additional Prepayment Of Purchase Contract						$ 500,000

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