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MAINLAND CHINA CONTRIBUTION PLAN AND PROFIT APPROPRIATION (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Defined contribution plan expenses | $ 3,420,774 | $ 3,147,927 | $ 4,087,334
Aggregate balance of statutory common reserves | 31,991,537 | $ 21,969,950 | $ 17,720,748
Restrictions of statutory reserves | $ 256,018,805 |  |

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