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Inventories
3 Months Ended
Mar. 31, 2019
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:
 
Mar 31, 2019
 
Dec 31, 2018
Raw materials
$
58,479,988

 
$
59,778,767

Work-in-process
18,095,167

 
21,033,532

Finished goods
37,582,787

 
33,389,087

 
$
114,157,942

 
$
114,201,386