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Schedule II-Schedule of Valuation and Qualifying Accounts (Details) - USD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Provision for Inventories      
Movement in schedule of valuation and qualifying accounts      
Balance at beginning of period $ 297,208 $ 594,939 $ 595,523
Deductions   297,731 584
Balance at end of period 297,208 297,208 594,939
Provision for Accounts Receivables      
Movement in schedule of valuation and qualifying accounts      
Balance at beginning of period 149,665 101,872 1,731,985
Additions   47,793 24,272
Deductions 3,283   1,654,385
Balance at end of period 146,382 149,665 101,872
Deferred Tax Valuation      
Movement in schedule of valuation and qualifying accounts      
Balance at beginning of period 6,151,398 5,825,954 9,197,333
Additions   325,444  
Deductions 1,121,560   3,371,379
Balance at end of period 5,029,838 6,151,398 5,825,954
Provision for Rebates      
Movement in schedule of valuation and qualifying accounts      
Balance at beginning of period 4,586,847 4,794,193 38,983,285
Additions 24,212,830 24,372,111 21,738,072
Deductions 24,526,108 24,579,457 55,927,164
Balance at end of period 4,273,569 4,586,847 4,794,193
Accounts payable      
Movement in schedule of valuation and qualifying accounts      
Balance at beginning of period $ 3,586,726 3,896,341 4,115,628
Balance at end of period   $ 3,586,726 $ 3,896,341