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, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Feb. 25, 2016
Property, Plant and Equipment [Abstract]          
Sales price of corporate headquarters, land and building to a third party         $ 4,053,000
Gain on sale of property and equipment $ 912 $ 1,920,273  
Proceeds from sale of property and equipment     1,749,484  
Depreciation expense $ 500 $ 400 1,000 800  
Depreciation and amortization expense relating to short-term assets included with prepaid expenses     $ 1,500 $ 9,000