Intangible assets - Costs and accumulated amortization (Details) - USD ($)	Dec. 31, 2023	Dec. 31, 2022
Cost
Finite-Lived Intangible Assets, Gross	$ 6,008,390	$ 4,900,000
Accumulated amortization
Finite-Lived Intangible Assets, Accumulated Amortization	(2,655,205)	(2,081,112)
Intangible assets, net	3,353,185	2,818,888
Trade name
Cost
Finite-Lived Intangible Assets, Gross	3,096,900	2,700,000
Accumulated amortization
Finite-Lived Intangible Assets, Accumulated Amortization	(1,106,615)	(920,000)
Non-compete agreement
Cost
Finite-Lived Intangible Assets, Gross	268,590
Accumulated amortization
Finite-Lived Intangible Assets, Accumulated Amortization	(13,430)
Customer relationships
Cost
Finite-Lived Intangible Assets, Gross	442,900
Accumulated amortization
Finite-Lived Intangible Assets, Accumulated Amortization	(7,382)
Facility management contracts
Cost
Finite-Lived Intangible Assets, Gross	2,200,000	2,200,000
Accumulated amortization
Finite-Lived Intangible Assets, Accumulated Amortization	$ (1,527,778)	$ (1,161,112)