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Intangible assets (Tables) | 12 Months Ended
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Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Finite-Lived Intangible Assets [Table Text Block] |
|  | 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 |
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] | 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 |

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- Definition Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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