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Intangible assets | 12 Months Ended
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Dec. 31, 2022
Intangible assets |
Intangible assets | 9. Intangible assets The Company’s purchase transactions for Aerex and PERC identified certain intangible assets. The remaining intangible assets and their respective useful lives are as follows: non-compete agreements (3 and 5 years), trade names (15 years), and facility management contracts (6 years). The costs and accumulated amortization for these assets were as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
​ |  | 2022 |  | 2021
Cost |  | ​ |  |  | ​ |
Non-compete agreements | ​ | $ | 530,000 | ​ | $ | 530,000
Trade names | ​ |  | 2,700,000 | ​ |  | 2,700,000
Facility management contracts | ​ |  | 2,200,000 | ​ |  | 2,200,000
​ | ​ |  | 5,430,000 | ​ |  | 5,430,000
Accumulated amortization | ​ |  | ​ | ​ |  |
Non-compete agreements | ​ |  | (530,000) | ​ |  | (493,889)
Trade names | ​ |  | (920,000) | ​ |  | (740,000)
Facility management contracts | ​ |  | (1,161,112) | ​ |  | (794,445)
​ | ​ |  | (2,611,112) | ​ |  | (2,028,334)
Intangible assets, net | ​ | $ | 2,818,888 | ​ | $ | 3,401,666
​ Amortization of intangible assets for each of the next five years and thereafter is expected to be as follows: ​
​ | ​ | ​ | ​
2023 |  | $ | 546,667
2024 | ​ |  | 546,667
2025 | ​ |  | 485,554
2026 | ​ |  | 180,000
2027 | ​ |  | 180,000
Thereafter | ​ |  | 880,000
​ | ​ | $ | 2,818,888
​ Amortization expense was $582,778 and $746,667 for the years ended December 31, 2022 and 2021, respectively.

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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -URI https://asc.fasb.org/subtopic&trid=2144471 + Details
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