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Schedule II-Schedule of Valuation and Qualifying Accounts (Details) - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Provision for Inventories      
Movement in schedule of valuation and qualifying accounts      
Balance at beginning of period $ 681,395 $ 681,395 $ 681,395
Additions 176,424    
Deductions 262,296    
Balance at end of period 595,523 681,395 681,395
Provision for Accounts Receivables      
Movement in schedule of valuation and qualifying accounts      
Balance at beginning of period 1,795,481 1,725,806 1,698,506
Additions 92,000 116,395 27,300
Deductions 155,496 46,720  
Balance at end of period 1,731,985 1,795,481 1,725,806
Deferred Tax Valuation      
Movement in schedule of valuation and qualifying accounts      
Balance at beginning of period 7,751,972 9,385,456 8,577,666
Additions 1,445,361   807,790
Deductions   1,633,484  
Balance at end of period 9,197,333 7,751,972 9,385,456
Provision for Rebates      
Movement in schedule of valuation and qualifying accounts      
Balance at beginning of period 41,171,880 33,838,780 26,793,666
Additions 19,693,872 19,488,956 19,115,643
Deductions 21,882,467 12,155,856 12,070,529
Balance at end of period 38,983,285 41,171,880 33,838,780
Accounts payable      
Movement in schedule of valuation and qualifying accounts      
Balance at beginning of period 3,733,199 4,160,099  
Balance at end of period $ 3,591,534 $ 3,733,199 $ 4,160,099