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Taxes (Details 1) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Taxes [Abstract] |  |
China income tax rate | 25.00% | 25.00%
IPO costs | 7.70% | 0.00%
PRC - non-deductible expense | (1.70%) | 0.00%
Cayman - non-deductible expense | (9.60%) | 0.00%
Effective tax rate | 21.40% | 25.00%

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