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2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($) | Dec. 31, 2020 | Dec. 31, 2019
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Accounting Policies [Abstract] |  |
Gross accounts receivable | $ 9,376,937 | $ 4,346,810
Allowance for doubtful accounts | (173,603) | (276,234)
Total accounts receivable, net | $ 9,203,334 | $ 4,070,576

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- Definition Amount, before allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121593590&loc=d3e4428-111522 + Details
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