Retail segment contingency (Details Textual) (USD $)	3 Months Ended	9 Months Ended
Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Retail Water Operations License Period			20 years
Percentage Of Revenue, Retail Water Operations	36.00%	41.00%	37.00%	44.00%
Percentage Of Gross Profit, Retail Water Operations	51.00%	46.00%	52.00%
Goodwill	$ 3,587,754	$ 3,587,754	$ 3,587,754	$ 3,587,754	$ 3,587,754

Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions.

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+ Details