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Construction in Progress (Tables)
 6 Months Ended
Jun. 30, 2018
Schedule of Construction in Progress [Table Text Block]
    December 31,     June 30,  
    2017     2018  
Construction in progress $ 24,288,889   $ 22,039,835  
Prepayment for acquisition of property, plant and equipment   740,401     4,326,671  
Carrying amount $ 25,029,290   $ 26,366,506