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Accounting policies (Tables) | 9 Months Ended
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Sep. 30, 2025
Accounting policies |
Schedule of Disaggregation of revenue | The following table presents the Company’s revenue disaggregated by revenue source. ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended September 30, |  | Nine Months Ended September 30,
​ |  | 2025 |  | 2024 |  | 2025 |  | 2024
Retail revenue | ​ | $ | 7,770,344 | ​ | $ | 7,585,992 | ​ | $ | 25,819,712 | ​ | $ | 24,392,814
Bulk revenue | ​ |  | 8,394,614 | ​ |  | 8,767,168 | ​ |  | 25,081,146 | ​ |  | 25,557,220
Services revenue | ​ |  | 14,289,315 | ​ |  | 12,677,837 | ​ |  | 35,815,785 | ​ |  | 42,017,917
Manufacturing revenue | ​ |  | 4,664,433 | ​ |  | 4,359,560 | ​ |  | 15,708,527 | ​ |  | 13,591,154
Total revenue | ​ | $ | 35,118,706 | ​ | $ | 33,390,557 | ​ | $ | 102,425,170 | ​ | $ | 105,559,105
​ Services revenue consists of the following: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended September 30, |  | Nine Months Ended September 30,
​ |  | 2025 |  | 2024 |  | 2025 |  | 2024
Construction revenue | ​ | $ | 6,360,333 | ​ | $ | 4,251,237 | ​ | $ | 11,404,500 | ​ | $ | 17,632,772
Operations and maintenance revenue | ​ |  | 7,715,000 | ​ |  | 7,492,121 | ​ |  | 23,695,704 | ​ |  | 21,660,396
Design and consulting revenue | ​ |  | 213,982 | ​ |  | 934,479 | ​ |  | 715,581 | ​ |  | 2,724,749
Total services revenue | ​ | $ | 14,289,315 | ​ | $ | 12,677,837 | ​ | $ | 35,815,785 | ​ | $ | 42,017,917
​
Summary of revenue recognized and amounts billed on contracts in progress | Revenue recognized and amounts billed on contracts in progress are summarized as follows:
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, | ​ | December 31,
​ | ​ | 2025 | ​ | 2024
Revenue recognized to date on contracts in progress |  | $ | 123,685,220 | ​ | $ | 114,590,991
Amounts billed to date on contracts in progress | ​ |  | (131,049,672) | ​ |  | (121,833,354)
Retainage | ​ | ​ | 2,414,307 | ​ | ​ | 2,585,952
Net contract liability | ​ | $ | (4,950,145) | ​ | $ | (4,656,411)
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, | ​ | December 31,
​ | ​ | 2025 | ​ | 2024
Contract assets |  | $ | 6,731,861 |  | $ | 4,470,243
Contract liabilities | ​ |  | (11,682,006) | ​ |  | (9,126,654)
Net contract liability | ​ | $ | (4,950,145) | ​ | $ | (4,656,411)

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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 -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-10 + 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 -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-5 + Details
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