Property, plant and equipment and construction in progress - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Property, plant and equipment and construction in progress
Construction in progress was placed in service	$ 5,883,845	$ 1,395,485
Depreciation expense	$ 6,128,825	$ 5,855,935	$ 5,823,008