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Schedule II-Schedule of Valuation and Qualifying Accounts (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Provision for Inventories |  |  |
Movement in schedule of valuation and qualifying accounts |  |  |
Balance at beginning of period | $ 297,208 | $ 297,208 | $ 594,939
Deductions |  |  | 297,731
Balance at end of period | 297,208 | 297,208 | 297,208
Provision for Accounts Receivables |  |  |
Movement in schedule of valuation and qualifying accounts |  |  |
Balance at beginning of period | 146,382 | 149,665 | 101,872
Additions | 125,000 |  | 47,793
Deductions | 65,560 | 3,283 |
Balance at end of period | 205,822 | 146,382 | 149,665
Deferred Tax Valuation |  |  |
Movement in schedule of valuation and qualifying accounts |  |  |
Balance at beginning of period | 5,029,838 | 6,151,398 | 5,825,954
Additions |  |  | 325,444
Deductions | 5,029,838 | 1,121,560 |
Balance at end of period |  | 5,029,838 | 6,151,398
Provision for Rebates |  |  |
Movement in schedule of valuation and qualifying accounts |  |  |
Balance at beginning of period | 4,273,569 | 4,586,847 | 4,794,193
Additions | 26,104,612 | 24,212,830 | 24,372,111
Deductions | 26,566,256 | 24,526,108 | 24,579,457
Balance at end of period | 3,811,925 | 4,273,569 | 4,586,847
Accounts payable |  |  |
Movement in schedule of valuation and qualifying accounts |  |  |
Balance at beginning of period | 3,586,726 | 3,896,341 |
Balance at end of period | $ 3,435,352 | $ 3,586,726 | $ 3,896,341

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- Definition Amount of valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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