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Inventories
3 Months Ended
Mar. 31, 2019
Inventory Disclosure [Abstract]  
Inventories

5. Inventories

 

Inventories consist of the following:

 

    March 31, 2019     December 31, 2018  
Raw materials   $ 10,571,725     $ 10,347,616  
Finished goods     993,930       669,843  
Total inventories   $ 11,565,655     $ 11,017,459