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Valuation and Qualifying Accounts (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Allowance for uncollectible amounts, cash discounts, chargebacks, and credits issued for damaged products: |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at beginning of period | $ 792,051 | $ 804,420 | $ 326,697
Charged to costs and expenses | 4,940,313 | 5,915,066 | 4,610,899
Charged to other accounts | 0 | 0 | 0
Deductions | (4,747,687) | (5,927,435) | (4,133,176)
Balance at end of period | 984,677 | 792,051 | 804,420
Valuation allowance for deferred tax assets: |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at beginning of period | 18,511,161 | 17,382,052 | 15,632,235
Charged to costs and expenses | 684,960 | 1,129,109 | 1,749,817
Charged to other accounts | 0 | 0 | 0
Deductions | 0 | 0 | 0
Balance at end of period | $ 19,196,121 | $ 18,511,161 | $ 17,382,052

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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(Column B)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 Reference 2: 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(Column E)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 + Details
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