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Intangible assets (Tables)
 12 Months Ended
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