Accounting policies - Disaggregated revenue (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Total Revenue	$ 180,211,233	$ 94,104,972
Contracts in progress.
Number of days after consumption billings are considered past due	45 days
Net Income (Loss)	$ 29,585,391	5,856,294
Income from operations	$ 37,167,627	$ 9,272,185
Increase in basic earnings	$ 1.95	$ 0.54
Increase in diluted earnings	$ 1.93	$ 0.54
Change in Accounting Method Accounted for as Change in Estimate [Member]
Contracts in progress.
Net Income (Loss)	$ 1,750,750
Income from operations	$ 2,356,439
Increase in basic earnings	$ 0.11
Increase in diluted earnings	$ 0.11
Minimum [Member]
Contracts in progress.
Number of days after consumption billings are collected	30 days
Maximum [Member]
Contracts in progress.
Number of days after consumption billings are collected	45 days
Retail revenue [Member]
Total Revenue	$ 30,158,051	$ 25,954,013
Bulk revenue [Member]
Total Revenue	34,595,058	32,991,066
Services revenue [Member]
Total Revenue	97,966,650	28,835,428
Services revenue [Member] | Change in Accounting Method Accounted for as Change in Estimate [Member]
Contracts in progress.
Income from operations	2,356,439
Services revenue [Member] | Transferred over Time [Member]
Total Revenue	77,411,792	14,146,271
Services revenue [Member] | Transferred at Point in Time [Member]
Total Revenue	20,554,858	14,689,157
Manufacturing revenue [Member]
Total Revenue	17,491,474	6,324,465
Construction Sevices [Member]
Total Revenue	77,306,704	11,616,274
Operations and Maintenance [Member]
Total Revenue	19,368,365	14,152,158
Design and Consulting Services [Member]
Total Revenue	$ 1,291,581	$ 3,066,996