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Inventories
3 Months Ended
Mar. 31, 2019
Inventory Disclosure [Abstract]  
Inventories Inventories
Inventories consisted of the following at the respective balance sheet dates:
March 31, 2019December 31, 2018
Raw materials
$143,533,414 $139,058,541 
Work-in-process
35,811,334 35,386,615 
Finished goods
45,958,294 50,836,443 
Total Inventory
$225,303,042 $225,281,599