Quarterly report pursuant to Section 13 or 15(d)

Property and equipment (Schedule of Property and Equipment) (Details)

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Property and equipment (Schedule of Property and Equipment) (Details) - USD ($)
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Property, Plant and Equipment [Line Items]      
Property and equipment $ 116,510   $ 116,510
Less accumulated depreciation 111,447   110,972
Total property and equipment, net 5,063   5,538
Depreciation expense 500 $ 400  
Office and computer equipment [Member]      
Property, Plant and Equipment [Line Items]      
Property and equipment $ 116,510   $ 116,510