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Valuation and Qualifying Accounts (Details) - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
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 $ 381,240 $ 438,357 $ 593,116
Charged to costs and expenses 3,755,804 3,903,285 5,166,568
Charged to other accounts 0 0 0
Deductions (3,687,185) (3,960,402) (5,321,327)
Balance at end of period 449,859 381,240 438,357
Valuation allowance for deferred tax assets:      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of period 185,497 152,074 131,617
Charged to costs and expenses 203,003 33,423 20,457
Charged to other accounts 0 0 0
Deductions 0 0 0
Balance at end of period $ 388,500 $ 185,497 $ 152,074