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Accounting policies (Tables) | 6 Months Ended
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Jun. 30, 2021
Accounting policies |
Schedule of Disaggregation of revenue | The following table presents the Company’s revenue disaggregated by revenue source (unaudited). ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended June 30, |  | Six Months Ended June 30,
​ |  | 2021 |  | 2020 |  | 2021 |  | 2020
Retail revenue | ​ | $ | 5,674,790 | ​ | $ | 5,966,296 | ​ | $ | 11,386,095 | ​ | $ | 13,223,728
Bulk revenue | ​ |  | 6,711,971 | ​ |  | 5,866,397 | ​ |  | 12,957,941 | ​ |  | 12,306,681
Services revenue | ​ |  | 3,763,239 | ​ |  | 3,476,000 | ​ |  | 7,304,085 | ​ |  | 6,590,813
Manufacturing revenue | ​ |  | 551,524 | ​ |  | 3,778,554 | ​ |  | 2,156,720 | ​ |  | 7,691,746
Total revenue | ​ | $ | 16,701,524 | ​ | $ | 19,087,247 | ​ | $ | 33,804,841 | ​ | $ | 39,812,968
​
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:
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, 2021 | ​ | December 31, 2020
Revenue recognized to date on contracts in progress |  | $ | 6,434,715 | ​ | $ | 17,534,449
Amounts billed to date on contracts in progress | ​ |  | (6,277,688) | ​ |  | (17,791,928)
Retainage | ​ | ​ | 244,025 | ​ | ​ | 312,130
Net contract asset | ​ | $ | 401,052 | ​ | $ | 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:
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, 2021 | ​ | December 31, 2020
Contract assets |  | $ | 415,633 |  | $ | 516,521
Contract liabilities | ​ |  | (14,581) | ​ |  | (461,870)
Net contract asset | ​ | $ | 401,052 | ​ | $ | 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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