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Long term debt (Details Textual) - Demand Note Payable [Member]
12 Months Ended
Dec. 31, 2015
USD ($)
Debt Instrument [Line Items]  
Debt Instrument, Periodic Payment $ 500,000
Debt Instrument, Maturity Date May 14, 2016
Loans Payable, Original Amount $ 10,000,000
Debt Instrument, Frequency of Periodic Payment quarterly installments
Debt Instrument, Basis Spread on Variable Rate 1.50%