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Intangible assets - Costs and accumulated amortization (Details) - USD ($) | Dec. 31, 2024 | Dec. 31, 2023
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Cost |  |
Finite-lived intangible assets, gross | $ 6,008,390 | $ 6,008,390
Accumulated amortization |  |
Finite-lived intangible assets, accumulated amortization | (3,311,575) | (2,655,205)
Intangible assets, net | 2,696,815 | 3,353,185
Trade names |  |
Cost |  |
Finite-lived intangible assets, gross | 3,096,900 | 3,096,900
Accumulated amortization |  |
Finite-lived intangible assets, accumulated amortization | (1,313,075) | (1,106,615)
Non-compete agreement |  |
Cost |  |
Finite-lived intangible assets, gross | 268,590 | 268,590
Accumulated amortization |  |
Finite-lived intangible assets, accumulated amortization | (67,147) | (13,430)
Customer relationships |  |
Cost |  |
Finite-lived intangible assets, gross | 442,900 | 442,900
Accumulated amortization |  |
Finite-lived intangible assets, accumulated amortization | (36,908) | (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 | $ (1,894,445) | $ (1,527,778)

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