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Accounting policies (Tables) | 9 Months Ended
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Sep. 30, 2021
Accounting policies |
Schedule of Estimated fair value of reporting segment |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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 | %
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Schedule of Disaggregation of revenue | The following table presents the Company’s revenue disaggregated by revenue source (unaudited). ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended September 30, |  | Nine Months Ended September 30,
​ |  | 2021 |  | 2020 |  | 2021 |  | 2020
Retail revenue | ​ | $ | 5,247,042 | ​ | $ | 4,993,069 | ​ | $ | 16,633,137 | ​ | $ | 18,216,797
Bulk revenue | ​ |  | 6,868,134 | ​ |  | 6,061,475 | ​ |  | 19,826,075 | ​ |  | 18,368,156
Services revenue | ​ |  | 3,210,584 | ​ |  | 3,351,935 | ​ |  | 10,514,669 | ​ |  | 9,942,748
Manufacturing revenue | ​ |  | 1,087,386 | ​ |  | 3,259,778 | ​ |  | 3,244,106 | ​ |  | 10,951,524
Total revenue | ​ | $ | 16,413,146 | ​ | $ | 17,666,257 | ​ | $ | 50,217,987 | ​ | $ | 57,479,225
​
Summary of revenue recognized and amounts billed on services segment and manufacturing segment contracts in progress | Revenue recognized and amounts billed on contracts in progress are summarized as follows:
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, 2021 | ​ | December 31, 2020
Revenue recognized to date on contracts in progress |  | $ | 6,808,572 | ​ | $ | 17,534,449
Amounts billed to date on contracts in progress | ​ |  | (6,565,955) | ​ |  | (17,791,928)
Retainage | ​ | ​ | 195,341 | ​ | ​ | 312,130
Net contract asset | ​ | $ | 437,958 | ​ | $ | 54,651
Summary of net balances of billings reflected in the accompanying consolidated balance sheet | The above net balances are reflected in the accompanying condensed consolidated balance sheets as follows:
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, 2021 | ​ | December 31, 2020
Contract assets |  | $ | 483,190 |  | $ | 516,521
Contract liabilities | ​ |  | (45,232) | ​ |  | (461,870)
Net contract asset | ​ | $ | 437,958 | ​ | $ | 54,651

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- Definition The tabular disclosure of revenue recognized and amounts billed on services segment and manufacturing segment contracts in progress. + References No definition available. + Details
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- Definition Tabular disclosure of receivable, contract asset, and contract liability from contract with customer. Includes, but is not limited to, change in contract asset and contract liability. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130551-203045 + Details
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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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