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Loans receivable (Details Textual) (USD $)
 12 Months Ended
Dec. 31, 2013
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
Two loans originally aggregating $897,000, bearing interest at 5% per annum, receivable in aggregate monthly installments of $12,678 to January 2013, and secured by the machinery and equipment of the Lower Valley plant [Member]
  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Loans Receivable Face Amount 897,000
Loans Receivable Interest Rate Stated Percentage 5.00%
Loans Receivable Monthly Installment $ 12,678
Loans Receivable Maturity Date 2013-01-31