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Other affiliates (Details Textual) (USD $)	1 Months Ended	3 Months Ended									1 Months Ended		3 Months Ended		12 Months Ended
	Nov. 30, 2012 sqm	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012	May 31, 2010	Mar. 04, 2010 gal	Dec. 31, 2009 gal	Dec. 31, 2007 gal	Nov. 30, 2012 Minimum [Member] gal	Nov. 30, 2012 Maximum [Member] gal	Aug. 31, 2012 N S C Agua [Member]	May 31, 2010 N S C Agua [Member]	Mar. 31, 2013 N S C Agua [Member]	Mar. 31, 2012 N S C Agua [Member]	Dec. 31, 2012 N S C Agua [Member]	Jul. 31, 2012 N S C Agua [Member]
Equity Method Investment, Ownership Percentage		43.50%										50.00%	50.00%
Assets		$ 153,150,993		$ 150,449,086									$ 1,432,000		$ 1,452,000
Liabilities		13,847,428		14,314,496									179,000		116,000
Seawater Reverse Osmosis Desalination Plant, Per Day Processing Capacity (Gallon)											100,000,000	100,000,000
Proceeds from Related Party Debt															4,000,000
Additional Prepayment Of Purchase Contract																500,000
Further Additional Prepayment Of Purchase Contract																500,000
Further Payment As Compensation For Operation and Maintenance											500,000
Stated Monthly Rent	20,000
Lease Term	20 years
Area Of Land, Lease Space	5,000
Plant Capacity (Gallons)						600,000	1,700,000	720,000	20,000,000	40,000,000
Equity Method Investment Additional Ownership Interest, Percentage					25.00%
General and Administrative Expense		$ 3,568,936	$ 3,514,685										$ 479,307	$ 341,327	$ 6,400,000

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The additional prepayment to be paid on extended date for the extended purchase contract.

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The additional percentage of ownership of common stock or equity participation in the investee available to purchase under an option agreement.

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The further additional prepayment to be paid on extended date for the extended purchase contract.

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Represents the compensation for operation and maintenance of equipment.

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Plant capacity in million gallons per day.

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The processing capacity per day seawater reverse osmosis desalination plant.

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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The cash inflow from a long-term borrowing made from related parties where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth. Alternate caption: Proceeds from Advances from Affiliates.

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