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Valuation and Qualifying Accounts (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Allowance for Doubtful Accounts, Current
      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of period $ 235,580 $ 163,748 $ 235,280
Charged to costs and expenses 2,069,470 2,151,890 1,494,834
Charged to other accounts 0 0 0
Deductions (2,116,463) [1] (2,080,058) [1] (1,566,366) [1]
Balance at end of period 188,587 235,580 163,748
Valuation Allowance of Deferred Tax Assets
      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of period 94,459 80,862 70,112
Charged to costs and expenses 13,859 13,597 10,750
Charged to other accounts 0 0 0
Deductions 0 0 0
Balance at end of period $ 108,318 $ 94,459 $ 80,862
[1] Composed of actual returns and credits for chargebacks and cash discounts.