Quarterly report pursuant to Section 13 or 15(d)

Property and equipment (Narrative) (Details)

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Property and equipment (Narrative) (Details) - USD ($)
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Feb. 29, 2016
Property, Plant and Equipment [Abstract]      
Depreciation expense $ 400 $ 40,000  
Sales price of corporate headquarters, land and building to a third party     $ 4,000,000
Proceeds from sale of property and equipment 1,748,571  
Gain on sale of property and equipment (Note 2) $ 1,919,361