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Accounting policies (Tables) | 12 Months Ended
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Dec. 31, 2020
Accounting policies |
Schedule of Estimated useful lives | Rates are determined based on the estimated useful lives of the assets as follows: ​
​ | ​ | ​
Buildings |  | 5 to 40 years
Plant and equipment |  | 4 to 40 years
Distribution system |  | 3 to 40 years
Office furniture, fixtures and equipment |  | 3 to 10 years
Vehicles |  | 3 to 10 years
Leasehold improvements |  | Shorter of 5 years or lease term
Lab equipment |  | 5 to 10 years
Schedule of Estimated fair value of reporting segment | The respective weightings the Company applied to each method for the years ended December 31 were as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | As of December 31, 2020
Method |  | Retail |  | Bulk |  | Services |  | Manufacturing |
Discounted cash flow |  | 80 | % | 80 | % | 80 | % | 80 | %
Guideline public company |  | 20 | % | 20 | % | 20 | % | 20 | %
Mergers and acquisitions |  | — | % | — | % | — | % | — | %
​ |  | 100 | % | 100 | % | 100 | % | 100 | %
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | As of December 31, 2019
Method |  | Retail |  | Bulk |  | Manufacturing |
Discounted cash flow |  | 80 | % | 80 | % | 80 | %
Guideline public company |  | 10 | % | 10 | % | 10 | %
Mergers and acquisitions |  | 10 | % | 10 | % | 10 | %
​ |  | 100 | % | 100 | % | 100 | %
Schedule of Disaggregation of revenue | The following table presents the Company’s revenue disaggregated by revenue source. ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Year Ended December 31,
​ |  | 2020 |  | 2019
Retail revenue | ​ | $ | 22,952,370 | ​ | $ | 26,456,022
Bulk revenue | ​ |  | 24,312,546 | ​ |  | 26,986,108
Services revenue | ​ |  | 12,937,859 | ​ |  | 1,759,446
Manufacturing revenue | ​ |  | 12,425,351 | ​ |  | 13,592,075
Total revenue | ​ | $ | 72,628,126 | ​ | $ | 68,793,651
​

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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=121604090&loc=SL49130545-203045 + Details
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