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INVENTORIES (Tables)
 3 Months Ended
Mar. 31, 2017
Inventory Disclosure [Abstract]  
Schedule of components of 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, 2017
 
Dec 31, 2016
Raw materials
$
31,683,122

 
$
31,973,073

Work-in-process
11,948,944

 
9,897,857

Finished goods
24,759,883

 
18,928,579

 
$
68,391,949

 
$
60,799,509