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Schedule II-Schedule of Valuation and Qualifying Accounts (Details) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Provision for Inventories      
Movement in schedule of valuation and qualifying accounts      
Balance at beginning of period $ 681,395 $ 681,395 $ 239,752
Additions     530,000
Deductions     88,357
Balance at end of period 681,395 681,395 681,395
Provision for Accounts Receivables      
Movement in schedule of valuation and qualifying accounts      
Balance at beginning of period 1,725,806 1,698,506 2,186,190
Additions 116,395 27,300 50,000
Deductions 46,720   537,684
Balance at end of period 1,795,481 1,725,806 1,698,506
Deferred Tax Valuation      
Movement in schedule of valuation and qualifying accounts      
Balance at beginning of period 9,385,456 8,577,666 6,160,648
Additions   807,790 2,417,018
Deductions 1,633,484    
Balance at end of period 7,751,972 9,385,456 8,577,666
Provision for Rebates      
Movement in schedule of valuation and qualifying accounts      
Balance at beginning of period 33,838,780 26,793,666 21,993,267
Additions 19,488,956 19,115,643 17,912,447
Deductions 12,155,856 12,070,529 13,112,048
Balance at end of period 41,171,880 33,838,780 26,793,666
Accounts payable      
Movement in schedule of valuation and qualifying accounts      
Balance at beginning of period 4,160,099 3,611,962  
Balance at end of period $ 3,733,199 $ 4,160,099 $ 3,611,962