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Income Taxes (Details 2)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Schedule of reconciliation of statutory rates to Company's effective tax rate    
PRC Statutory rate 25.00% 25.00%
Effect of the U.S. Transition Tax under the 2017 TCJA 8.60%
Effect of different tax jurisdiction (0.80%) (1.70%)
Effect of expenses not deductible for PRC tax purposes (6.20%) 0.10%
Effect of income not taxable for PRC tax purposes
(Over) Underprovision in previous years (1.10%) 0.10%
Change in valuation allowance 3.00% 6.40%
Effective income tax rate 28.50% 29.90%