Cost of revenues and general and administrative expenses - Cost of revenues (Details) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Cost of revenues and general and administrative expenses [Line Items]
Cost of revenue	$ 63,749,849	$ 43,356,311
Subcontractor and other project costs
Cost of revenues and general and administrative expenses [Line Items]
Cost of revenue	16,717,422	5,853,617
Employee costs [Member]
Cost of revenues and general and administrative expenses [Line Items]
Cost of revenue	14,036,117	12,439,042
Fuel oil [Member]
Cost of revenues and general and administrative expenses [Line Items]
Cost of revenue	10,203,690	5,742,056
Electricity [Member]
Cost of revenues and general and administrative expenses [Line Items]
Cost of revenue	6,975,129	5,698,148
Depreciation [Member]
Cost of revenues and general and administrative expenses [Line Items]
Cost of revenue	5,261,463	5,855,073
Maintenance [Member]
Cost of revenues and general and administrative expenses [Line Items]
Cost of revenue	2,786,258	2,092,776
Insurance [Member]
Cost of revenues and general and administrative expenses [Line Items]
Cost of revenue	1,782,333	1,625,862
Retail license royalties [Member]
Cost of revenues and general and administrative expenses [Line Items]
Cost of revenue	1,590,250	1,418,820
Cost of plant sales [Member]
Cost of revenues and general and administrative expenses [Line Items]
Cost of revenue	1,129,702	24,757
Other [Member]
Cost of revenues and general and administrative expenses [Line Items]
Cost of revenue	$ 3,267,485	$ 2,606,160