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Inventories (Details Textual) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Inventories (Textual) |  |  |
Inventory reversals of write-downs |  | $ (73,860) | $ 2,450,213
Obsolete inventories loss | (58,992) |  | (202,297)
Continuing operations [Member] |  |  |
Inventories (Textual) |  |  |
Obsolete inventories loss | $ 58,992 | $ 0 | $ 202,297

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