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Loans receivable (Details) (USD $)
Dec. 31, 2013
Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans receivable $ 9,028,279 $ 10,840,811
Less current portion 1,691,102 1,812,532
Loans receivable, excluding current portion 7,337,177 9,028,279
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]    
Total loans receivable 6,912,337 7,925,386
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]    
Total loans receivable 73,084 356,474
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]    
Total loans receivable 2,042,858 2,546,325
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]    
Total loans receivable $ 0 $ 12,626