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Loans receivable (Details Textual) (USD $)	12 Months Ended
Loans receivable (Details Textual) (USD $)	Dec. 31, 2014
Two loans originally aggregating $10,996,290, bearing interest at 6.5% per annum, receivable in aggregate monthly installments of $124,827 to May 2019, and secured by the machinery and equipment of the North Side Water Works plant [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Receivable Face Amount	$ 10,996,290
Loans Receivable Interest Rate Stated Percentage	6.50%
Loans Receivable Monthly Installment	124,827
Loans Receivable Maturity Date	2019-05-31
Two loans originally aggregating $1,738,000, bearing interest at 5% per annum, receivable in aggregate monthly installments of $24,565 to March 2014, and secured by the machinery and equipment of the North Sound plant [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Receivable Face Amount	1,738,000
Loans Receivable Interest Rate Stated Percentage	5.00%
Loans Receivable Monthly Installment	24,565
Loans Receivable Maturity Date	2014-03-31
Two loans originally aggregating $3,671,039, bearing interest at 6.5% per annum, receivable in aggregate monthly installments of $54,513 to June 2017, and secured by the machinery and equipment of the Red Gate plant [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Receivable Face Amount	3,671,039
Loans Receivable Interest Rate Stated Percentage	6.50%
Loans Receivable Monthly Installment	$ 54,513
Loans Receivable Maturity Date	2017-06-30