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Inventories (Details Textual) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Inventories (Textual)      
Inventory reversals of write-downs $ (73,860) $ 2,450,213 $ 16,203
Inventory write-downs discontinued operations   $ 1,934,836