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Note payable (Tables)
12 Months Ended
Dec. 31, 2018
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments [Table Text Block]
Note payable consists of the following:
 
 
 
December 31,
 
 
 
2018
 
 
2017
 
Working capital loan from related party to Aerex bearing interest at 1.04% per annum and payable on March 31, 2018
 
$
-
 
 
$
686,000
 
Total note payable
 
 
-
 
 
 
686,000
 
Less current portion
 
 
-
 
 
 
686,000
 
Note payable, excluding current portion
 
$
-
 
 
$
-