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Valuation and Qualifying Accounts Allowance for Returns and Doubtful Accounts (Tables)
12 Months Ended
Dec. 31, 2013
Valuation and Qualifying Accounts [Abstract]  
Schedule of Valuation Accounts
 
 
Balance at
Beginning of
 
Charges (Benefits) to Expenses /
 
 
 
Balance at
End of
Period Ended
 
Period
 
Revenues
 
Deductions
 
Period
December 31, 2013
 
$
940,101

 
(294,074
)
 
369,725

 
$
276,302

December 31, 2012
 
$
1,723,679

 
357,301

 
1,140,879

 
$
940,101

December 31, 2011
 
$
3,242,458

 
120,992

 
1,639,771

 
$
1,723,679