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Inventories (Tables)
12 Months Ended
Dec. 31, 2017
Inventory Disclosure [Abstract]  
Schedule of Inventories

Inventories consisted of the following at December 31, 2017 and 2016:

 

    2017     2016  
             
Finished goods   $ 4,611,973     $ 4,102,621  
Spare parts     187,158       183,357  
Reserves for inventory obsolescence     (172,562 )     (121,862 )
                 
Inventories, net   $ 4,626,569     $ 4,164,116