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REVENUE (Tables) | 6 Months Ended
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Jun. 30, 2021
Revenue |
Disaggregation of revenue | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the Three Months Ended | ​ | For the Six Months Ended
​ | ​ | June 30, | ​ | June 30,
​ |  | 2021 |  | 2020 |  | 2021 |  | 2020
Sales to do-it-yourself customers | ​ | $ | 1,999,401 | ​ | $ | 1,853,115 | ​ | $ | 3,780,567 | ​ | $ | 3,198,597
Sales to professional service provider customers |  | ​ | 1,384,217 |  | ​ | 1,175,030 |  | ​ | 2,623,303 |  | ​ | 2,245,229
Other sales and sales adjustments |  | ​ | 81,983 |  | ​ | 63,450 |  | ​ | 152,630 |  | ​ | 124,256
Total sales | ​ | $ | 3,465,601 | ​ | $ | 3,091,595 | ​ | $ | 6,556,500 | ​ | $ | 5,568,082

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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130545-203045 + Details
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