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Non-controlling interest
12 Months Ended
Dec. 31, 2018
Noncontrolling Interest [Abstract]  
Noncontrolling Interest Disclosure [Text Block]
22.
Non-controlling interest
 
As of December 31, 2018, GZ Highpower was deconsolidated (See Note 13).
 
For the year ended December 31, 2017, non-controlling interest related to GZ Highpower in the consolidated statements of operations was gain of $441,044.