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Intangible assets (Tables) | 12 Months Ended
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Dec. 31, 2020
Intangible assets |
Schedule of Finite-Lived Intangible Assets | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
​ |  | 2020 |  | 2019
Cost |  | ​ |  |  | ​ |
Non-compete agreements | ​ | $ | 530,000 | ​ | $ | 530,000
Trade names | ​ |  | 2,700,000 | ​ |  | 2,700,000
Certifications/programs | ​ |  | 2,000,000 | ​ |  | 2,000,000
Customer backlogs | ​ |  | 460,000 | ​ |  | 460,000
Customer relationships | ​ | ​ | 2,000,000 | ​ | ​ | 2,000,000
Facility management contracts | ​ |  | 2,200,000 | ​ |  | 2,200,000
​ | ​ |  | 9,890,000 | ​ |  | 9,890,000
Accumulated amortization | ​ |  | ​ | ​ |  |
Non-compete agreements | ​ |  | (443,889) | ​ |  | (320,556)
Trade names | ​ |  | (560,000) | ​ |  | (380,000)
Certifications/programs | ​ |  | (2,000,000) | ​ |  | (2,000,000)
Customer backlogs | ​ |  | (310,000) | ​ |  | (130,000)
Customer relationships | ​ | ​ | (2,000,000) | ​ | ​ | (1,958,333)
Facility management contracts | ​ |  | (427,778) | ​ |  | (61,111)
​ | ​ |  | (5,741,667) | ​ |  | (4,850,000)
Intangible assets, net | ​ | $ | 4,148,333 | ​ | $ | 5,040,000
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense | Amortization of intangible assets for each of the next five years and thereafter is expected to be as follows: ​
​ | ​ | ​ | ​
2021 |  | $ | 746,667
2022 | ​ |  | 582,778
2023 | ​ |  | 546,667
2024 | ​ |  | 546,667
2025 | ​ |  | 485,556
Thereafter | ​ |  | 1,239,998
​ | ​ | $ | 4,148,333
​

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