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Inventories
6 Months Ended
Jun. 30, 2018
Inventory Disclosure [Abstract]  
Inventories
Inventories
Inventories are stated at the lower of cost or net realizable value. Cost is determined by either specific identification or weighted average methods. The components of inventories are as follows:
 
Jun 30, 2018
 
Dec 31, 2017
Raw materials
$
46,202,040

 
$
37,748,316

Work-in-process
16,477,860

 
9,491,408

Finished goods
27,891,241

 
24,885,457

 
$
90,571,141

 
$
72,125,181