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Accounting policies (Tables) | 6 Months Ended
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Jun. 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 June 30, |  | Six Months Ended June 30,
​ |  | 2020 |  | 2019 |  | 2020 |  | 2019
Retail revenue | ​ | $ | 5,966,296 | ​ | $ | 6,983,515 | ​ | $ | 13,223,728 | ​ | $ | 13,670,175
Bulk revenue | ​ |  | 5,866,397 | ​ |  | 6,941,051 | ​ |  | 12,306,681 | ​ |  | 14,052,364
Services revenue | ​ |  | 3,476,000 | ​ |  | 90,792 | ​ |  | 6,590,813 | ​ |  | 191,369
Manufacturing revenue | ​ |  | 3,778,554 | ​ |  | 4,289,902 | ​ |  | 7,691,746 | ​ |  | 7,379,876
Total revenue | ​ | $ | 19,087,247 | ​ | $ | 18,305,260 | ​ | $ | 39,812,968 | ​ | $ | 35,293,784
​
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:
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, 2020 | ​ | December 31, 2019
Revenue recognized to date on contracts in progress |  | $ | 23,805,174 | ​ | $ | 24,041,993
Amounts billed to date on contracts in progress | ​ |  | (22,502,592) | ​ |  | (22,980,598)
​ | ​ | $ | 1,302,582 | ​ | $ | 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:
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, 2020 | ​ | December 31, 2019
Costs and estimated earnings in excess of billings |  | $ | 2,202,524 |  | $ | 1,675,781
Billings in excess of costs and estimated earnings | ​ |  | (899,942) | ​ |  | (614,386)
​ | ​ | $ | 1,302,582 | ​ | $ | 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 contract balances and changes in contract balances. + 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=118956577&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=118956577&loc=SL49130545-203045 + Details
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