Quarterly report pursuant to Section 13 or 15(d)

Intangible Assets and Liabilities Other Than Goodwill (Details)

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Intangible Assets and Liabilities Other Than Goodwill (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]        
Amortization of intangible assets $ 22,951 $ 25,981 $ 70,699 $ 77,357
Net credit to cost of sales for amortization of contract related intangible assets and liabilities $ 107,998 $ 211,876 $ 394,731 $ 656,042