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Accounting policies (Tables) | 3 Months Ended
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Mar. 31, 2021
Accounting policies |
Schedule of Disaggregation of revenue | The following table presents the Company’s revenue disaggregated by revenue source (unaudited). ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Three Months Ended March 31,
​ |  | 2021 |  | 2020
Retail revenue | ​ | $ | 5,711,305 | ​ | $ | 7,257,432
Bulk revenue | ​ |  | 6,245,970 | ​ |  | 6,440,284
Services revenue | ​ |  | 3,540,846 | ​ |  | 3,114,813
Manufacturing revenue | ​ |  | 1,605,196 | ​ |  | 3,913,192
Total revenue | ​ | $ | 17,103,317 | ​ | $ | 20,725,721
​
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:
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, 2021 | ​ | December 31, 2020
Revenue recognized to date on contracts in progress |  | $ | 8,186,878 | ​ | $ | 17,534,449
Amounts billed to date on contracts in progress | ​ |  | (7,977,023) | ​ |  | (17,791,928)
Retainage | ​ | ​ | 414,011 | ​ | ​ | 312,130
Net contract asset | ​ | $ | 623,866 | ​ | $ | 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 sheet as follows:
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, 2021 | ​ | December 31, 2020
Contract assets |  | $ | 669,419 |  | $ | 516,521
Contract liabilities | ​ |  | (45,553) | ​ |  | (461,870)
Net contract asset | ​ | $ | 623,866 | ​ | $ | 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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