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 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Feb. 29, 2016
Property, Plant and Equipment [Abstract]          
Depreciation expense $ 400 $ 38,000 $ 800 $ 51,000  
Sales price of corporate headquarters, land and building to a third party         $ 4,000,000
Proceeds from sale of property and equipment     1,749,484  
Gain on sale of property and equipment (Note 2) $ 912 $ 1,920,273