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Accounting policies - Disaggregated revenue (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Total Revenue | $ 33,591,079 | $ 32,479,158 | $ 67,306,464 | $ 72,168,548
Contracts in progress |  |  |  |
Number of days after consumption billings are considered past due |  |  | 45 days |
Income from operations | 5,283,764 | 5,010,790 | $ 9,894,527 | 12,324,784
Increase in net income | $ 5,096,205 | $ 15,850,257 | $ 9,887,234 | $ 22,324,605
Increase in basic earnings | $ 0.33 | $ 0.27 | $ 0.63 | $ 0.71
Increase in diluted earnings | $ 0.32 | $ 0.26 | $ 0.63 | $ 0.7
Retail revenue |  |  |  |
Total Revenue | $ 8,638,026 | $ 8,181,884 | $ 18,049,368 | $ 16,806,822
Bulk revenue |  |  |  |
Total Revenue | 8,274,816 | 8,447,958 | 16,686,532 | 16,790,052
Services revenue |  |  |  |
Total Revenue | 11,448,202 | 11,922,469 | 21,526,470 | 29,340,080
Manufacturing revenue |  |  |  |
Total Revenue | 5,230,035 | 3,926,847 | 11,044,094 | 9,231,594
Construction revenue | Services revenue |  |  |  |
Total Revenue | 2,825,935 | 4,004,072 | 5,044,167 | 13,381,536
Operations and maintenance revenue | Services revenue |  |  |  |
Total Revenue | 8,255,408 | 7,068,922 | 15,980,704 | 14,168,275
Design and consulting revenue | Services revenue |  |  |  |
Total Revenue | 366,859 | 849,475 | 501,599 | 1,790,269
Change in accounting method accounted for as change in estimate |  |  |  |
Contracts in progress |  |  |  |
Income from operations | 167,904 |  | 445,150 |
Increase in net income | $ 450,619 |  | $ 450,619 |
Increase in basic earnings | $ 0.03 |  | $ 0.03 |
Increase in diluted earnings | $ 0.03 |  | $ 0.03 |
Transferred over time | Services revenue |  |  |  |
Total Revenue | $ 3,104,731 | 3,988,174 | $ 5,284,992 | 13,385,268
Transferred at point in time | Services revenue |  |  |  |
Total Revenue | $ 8,343,472 | $ 7,934,295 | $ 16,241,478 | $ 15,954,812
Minimum |  |  |  |
Contracts in progress |  |  |  |
Number of days after consumption billings are collected |  |  | 30 days |
Maximum |  |  |  |
Contracts in progress |  |  |  |
Number of days after consumption billings are collected |  |  | 45 days |

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