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Schedule II-Schedule of Valuation and Qualifying Accounts (Details) - USD ($) | 12 Months Ended
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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

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- Definition Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 + Details
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