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Intangible assets (Tables) | 12 Months Ended
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Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Finite-Lived Intangible Assets [Table Text Block] |
|  | December 31, |
|  | 2017 |  | 2016 |
Cost |  |  |  |  |  |  |
Intangible asset management service agreement |  | $ | 856,356 |  | $ | 856,356 |
Belize water production and supply agreement |  |  | 1,522,419 |  |  | 1,522,419 |
Aerex - Non-compete agreement |  |  | 400,000 |  |  | 400,000 |
Aerex - Trade name |  |  | 1,400,000 |  |  | 1,400,000 |
Aerex - Certifications/programs |  |  | 2,000,000 |  |  | 2,000,000 |
Aerex - Customer backlog |  |  | 100,000 |  |  | 100,000 |
Aerex - Customer relationships |  |  | 2,000,000 |  |  | 2,000,000 |
|  |  | 8,278,775 |  |  | 8,278,775 |
Accumulated amortization |  |  |  |  |  |  |
Intangible asset management service agreement |  |  | (856,356) |  |  | (840,839) |
Belize water production and supply agreement |  |  | (988,652) |  |  | (922,460) |
Aerex - Non-compete agreement |  |  | (153,333) |  |  | (73,333) |
Aerex - Trade name |  |  | (178,889) |  |  | (85,556) |
Aerex - Certifications/programs |  |  | (1,277,778) |  |  | (611,111) |
Aerex - Customer backlog |  |  | (100,000) |  |  | (91,667) |
Aerex - Customer relationships |  |  | (958,333) |  |  | (458,333) |
|  |  | (4,513,341) |  |  | (3,083,299) |
Intangible assets, net |  | $ | 3,765,434 |  | $ | 5,195,476 |
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:
2018 |  | $ | 1,406,192 |
2019 |  |  | 795,081 |
2020 |  |  | 281,192 |
2021 |  |  | 166,192 |
2022 |  |  | 159,525 |
Thereafter |  |  | 957,252 |
|  | $ | 3,765,434 |

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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://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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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- Definition Tabular disclosure of the amount of amortization expense expected to be recorded in succeeding fiscal years for finite-lived intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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 + Details
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