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Loans receivable (Details Textual)
 12 Months Ended
Dec. 31, 2015
USD ($)
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 May 31, 2019
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 Jun. 30, 2017