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
Mar. 31, 2019
Mar. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]    
Amortization of intangible assets $ 24,099 $ 24,903
Net credit to cost of sales for amortization of contract related intangible assets and liabilities $ 173,292 $ 228,059