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Schedule II-Schedule of Valuation and Qualifying Accounts (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Provision for Inventories
      
Movement in schedule of valuation and qualifying accounts      
Balance at beginning of period $ 239,752 $ 258,435 $ 205,600
Additions 530,000 120,000 52,835
Deductions 88,357 138,683  
Balance at end of period 681,395 239,752 258,435
Provision for Rebates 681,395 239,752 258,435
Provision for Accounts Receivables
      
Movement in schedule of valuation and qualifying accounts      
Balance at beginning of period 2,186,190 2,078,944 780,900
Additions 50,000 107,246 1,298,044
Deductions 537,684    
Balance at end of period 1,698,506 2,186,190 2,078,944
Provision for Rebates 1,698,506 2,186,190 2,078,944
Deferred Tax Valuation
      
Movement in schedule of valuation and qualifying accounts      
Balance at beginning of period 6,039,054 4,883,416 5,442,682
Additions 2,404,763 1,155,638  
Deductions     559,266
Balance at end of period 8,443,817 6,039,054 4,883,416
Provision for Rebates 8,443,817 6,039,054 4,883,416
Provision for Rebates
      
Movement in schedule of valuation and qualifying accounts      
Balance at beginning of period 21,993,267 16,158,795 11,102,329
Additions 17,912,447 19,615,388 19,229,308
Deductions 13,112,048 13,780,916 14,172,842
Balance at end of period 26,793,666 21,993,267 16,158,795
Provision for Rebates 26,793,666 21,993,267 16,158,795
Accounts payable
      
Movement in schedule of valuation and qualifying accounts      
Balance at end of period 3,611,962 3,036,564 2,170,764
Provision for Rebates $ 3,611,962 $ 3,036,564 $ 2,170,764