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Accounting policies (Tables) | 9 Months Ended
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Sep. 30, 2020
Accounting policies |
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,
​ |  | 2020 |  | 2019 |  | 2020 |  | 2019
Retail revenue | ​ | $ | 4,993,069 | ​ | $ | 6,271,220 | ​ | $ | 18,216,797 | ​ | $ | 19,941,395
Bulk revenue | ​ |  | 6,061,475 | ​ |  | 6,449,757 | ​ |  | 18,368,156 | ​ |  | 20,502,121
Services revenue | ​ |  | 3,351,935 | ​ |  | 95,980 | ​ |  | 9,942,748 | ​ |  | 287,349
Manufacturing revenue | ​ |  | 3,259,778 | ​ |  | 3,072,282 | ​ |  | 10,951,524 | ​ |  | 10,452,158
Total revenue | ​ | $ | 17,666,257 | ​ | $ | 15,889,239 | ​ | $ | 57,479,225 | ​ | $ | 51,183,023
​
Summary of revenue recognized and amounts billed on services segment and manufacturing segment contracts in progress | Revenue recognized and amounts billed on services segment and manufacturing segment contracts in progress are summarized as follows:
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, 2020 | ​ | December 31, 2019
Revenue recognized to date on contracts in progress |  | $ | 26,940,207 | ​ | $ | 24,041,993
Amounts billed to date on contracts in progress | ​ |  | (26,570,097) | ​ |  | (22,980,598)
​ | ​ | $ | 370,110 | ​ | $ | 1,061,395
Summary of net balances of billings reflected in the accompanying consolidated balance sheet | The above net balances are reflected in the accompanying consolidated balance sheet as follows:
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, 2020 | ​ | December 31, 2019
Costs and estimated earnings in excess of billings |  | $ | 1,188,875 |  | $ | 1,675,781
Billings in excess of costs and estimated earnings | ​ |  | (818,765) | ​ |  | (614,386)
​ | ​ | $ | 370,110 | ​ | $ | 1,061,395

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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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