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Loans receivable (Details) - USD ($)
Dec. 31, 2015
Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans receivable $ 5,610,867 $ 7,337,177
Less current portion 1,841,851 1,726,310
Loans receivable, excluding current portion 3,769,016 5,610,867
Two loans originally aggregating $10,996,290, bearing interest at 6.5% per annum, receivable in aggregate monthly installments of $124,827 to June 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 4,678,355 5,831,504
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 $ 932,512 $ 1,505,673