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Intangible assets | 12 Months Ended
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Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible Assets Disclosure [Text Block] | 11. Intangible assets In February 2016, the Company purchased a 51% ownership interest in Aerex Industries, Inc. The purchase transaction identified certain intangible assets with a fair value of $5,900,000 and useful lives as follows: Non-Compete (5 years), Trade name (15 years), Certifications/programs (3 years), Customer backlog (1 year), and Customer relationships (4 years). The costs and accumulated amortization for these assets as of December 31, 2018 and 2017 were as follows:
|  | December 31, |
|  | 2018 |  |  | 2017 |
Cost |  |  |  |  |  |  |  |
Non-compete agreement |  | $ | 400,000 |  |  | $ | 400,000 |
Trade name |  |  | 1,400,000 |  |  |  | 1,400,000 |
Certifications/programs |  |  | 2,000,000 |  |  |  | 2,000,000 |
Customer backlog |  |  | 100,000 |  |  |  | 100,000 |
Customer relationships |  |  | 2,000,000 |  |  |  | 2,000,000 |
|  |  | 5,900,000 |  |  |  | 5,900,000 |
Accumulated amortization |  |  |  |  |  |  |  |
Non-compete agreement |  |  | (233,333 | ) |  |  | (153,333 | )
Trade name |  |  | (272,222 | ) |  |  | (178,889 | )
Certifications/programs |  |  | (1,944,444 | ) |  |  | (1,277,778 | )
Customer backlog |  |  | (100,000 | ) |  |  | (100,000 | )
Customer relationships |  |  | (1,458,334 | ) |  |  | (958,333 | )
|  |  | (4,008,333 | ) |  |  | (2,668,333 | )
Intangible assets, net |  | $ | 1,891,667 |  |  | $ | 3,231,667 |
Amortization of intangible assets for each of the next five years and thereafter is expected to be as follows:
2019 |  | $ | 728,889 |
2020 |  |  | 215,000 |
2021 |  |  | 100,000 |
2022 |  |  | 93,333 |
2023 |  |  | 93,333 |
Thereafter |  |  | 661,112 |
|  | $ | 1,891,667 |
Amortization expense was $1,340,000 and $1,363,850 for the years ended December 31, 2018 and 2017, respectively.

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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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