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Inventories (Tables)
12 Months Ended
Dec. 31, 2016
Inventory Disclosure [Abstract]  
Inventories

  December 31,
Inventories consisted of:  2016  2015
Finished goods  $33,971,922   $29,802,745 
Work in process   187,833    169,540 
Materials and supplies   3,078,106    5,535,306 
   $37,237,861   $35,507,591