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Valuation and Qualifying Accounts (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Allowance for uncollectible amounts, cash discounts, chargebacks, and credits issued for damaged products:
      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of period $ 188,587 $ 235,580 $ 163,748
Charged to costs and expenses 2,498,170 2,069,470 2,151,890
Charged to other accounts 0 0 0
Deductions (2,093,641) [1] (2,116,463) [1] (2,080,058) [1]
Balance at end of period 593,116 188,587 235,580
Valuation allowance for deferred tax assets:
      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of period 108,318 94,459 80,862
Charged to costs and expenses 23,299 13,859 13,597
Charged to other accounts 0 0 0
Deductions 0 0 0
Balance at end of period $ 131,617 $ 108,318 $ 94,459
[1] Composed of actual returns and credits for chargebacks and cash discounts.