Loans receivable (Details Textual) - Two loans originally aggregating $10,996,290, bearing interest at 6.5% per annum, receivable in aggregate monthly installments of $124,827 to June 2019, and secured by the machinery and equipment of the North Side Water Works plant [Member]	12 Months Ended
	Dec. 31, 2018 USD ($)
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	Jun. 30, 2019