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Valuation and Qualifying Accounts Allowance for Returns and Doubtful Accounts (Tables)
 12 Months Ended
Dec. 31, 2014
Valuation and Qualifying Accounts [Abstract]  
Schedule of Valuation Accounts
Period Ended
 
Balance at Beginning of Period
 
Charges (Benefits) to Expenses / Revenues
 
Deductions
 
Balance at End of Period
December 31, 2014
 
$
276,302

 
(64,904
)
 
91,868

 
$
119,530

December 31, 2013
 
$
940,101

 
(294,074
)
 
369,725

 
$
276,302

December 31, 2012
 
$
1,723,679

 
357,301

 
1,140,879

 
$
940,101