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Schedule II-Schedule of Valuation and Qualifying Accounts (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Provision for Inventories |  |  |
Movement in schedule of valuation and qualifying accounts |  |  |
Balance at beginning of period | $ 594,939 | $ 595,523 | $ 681,395
Additions |  |  | 176,424
Deductions | 297,731 | 584 | 262,296
Balance at end of period | 297,208 | 594,939 | 595,523
Provision for Accounts Receivables |  |  |
Movement in schedule of valuation and qualifying accounts |  |  |
Balance at beginning of period | 101,872 | 1,731,985 | 1,795,481
Additions | 47,793 | 24,272 | 92,000
Deductions |  | 1,654,385 | 155,496
Balance at end of period | 149,665 | 101,872 | 1,731,985
Deferred Tax Valuation |  |  |
Movement in schedule of valuation and qualifying accounts |  |  |
Balance at beginning of period | 5,825,954 | 9,197,333 | 7,751,972
Additions | 325,444 |  | 1,445,361
Deductions |  | 3,371,379 |
Balance at end of period | 6,151,398 | 5,825,954 | 9,197,333
Provision for Rebates |  |  |
Movement in schedule of valuation and qualifying accounts |  |  |
Balance at beginning of period | 4,794,193 | 38,983,285 | 41,171,880
Additions | 24,372,111 | 21,738,072 | 19,693,872
Deductions | 24,579,457 | 55,927,164 | 21,882,467
Balance at end of period | 4,586,847 | 4,794,193 | 38,983,285
Accounts payable |  |  |
Movement in schedule of valuation and qualifying accounts |  |  |
Balance at beginning of period | 4,115,628 | 3,591,534 |
Balance at end of period | $ 3,896,341 | $ 4,115,628 | $ 3,591,534

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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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