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 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]        
Amortization of intangible assets $ 26,473 $ 24,827 $ 51,376 $ 49,655
Net credit to cost of sales for amortization of contract related intangible assets and liabilities $ 216,107 $ 137,587 $ 444,166 $ 137,587