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Inventories (Tables)
12 Months Ended
Dec. 31, 2012
Inventory Disclosure [Abstract]  
Inventories

    2012     2011  
Finished goods   $ 28,819,060     $ 22,887,381  
Work in process     71,285       44,564  
Materials and supplies     1,401,775       1,563,047  
    $ 30,292,120     $ 24,494,992