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Long term debt (Details) - USD ($)
Dec. 31, 2015
Dec. 31, 2014
Debt Instrument [Line Items]    
Total debt $ 7,000,000 $ 9,000,000
Less current portion 7,000,000 9,000,000
Long term debt, excluding current portion 0 0
Demand Note Payable [Member]    
Debt Instrument [Line Items]    
Total debt $ 7,000,000 $ 9,000,000