Quarterly report pursuant to Section 13 or 15(d)

Intangible assets other than goodwill (Details)

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Intangible assets other than goodwill (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Goodwill and Intangible Assets Disclosure [Abstract]        
Amortization of Intangible Assets $ 24,741 $ 24,067 $ 73,511 $ 75,487