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Schedule II-Schedule of Valuation and Qualifying Accounts (Details) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Provision for Inventories      
Movement in schedule of valuation and qualifying accounts      
Balance at beginning of period $ 595,523 $ 681,395 $ 681,395
Additions   176,424  
Deductions 584 262,296  
Balance at end of period 594,939 595,523 681,395
Provision for Accounts Receivables      
Movement in schedule of valuation and qualifying accounts      
Balance at beginning of period 1,731,985 1,795,481 1,725,806
Additions 24,272 92,000 116,395
Deductions 1,654,385 155,496 46,720
Balance at end of period 101,872 1,731,985 1,795,481
Deferred Tax Valuation      
Movement in schedule of valuation and qualifying accounts      
Balance at beginning of period 9,197,333 7,751,972 9,385,456
Additions   1,445,361  
Deductions 3,371,379   1,633,484
Balance at end of period 5,825,954 9,197,333 7,751,972
Provision for Rebates      
Movement in schedule of valuation and qualifying accounts      
Balance at beginning of period 38,983,285 41,171,880 33,838,780
Additions 21,738,072 19,693,872 19,488,956
Deductions 55,927,164 21,882,467 12,155,856
Balance at end of period 4,794,193 38,983,285 41,171,880
Accounts payable      
Movement in schedule of valuation and qualifying accounts      
Balance at beginning of period 3,591,534 3,733,199  
Balance at end of period $ 4,115,628 $ 3,591,534 $ 3,733,199