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Assets held for sale (Details) (USD $)
6 Months Ended
Jun. 30, 2014
Dormitory
Dec. 31, 2013
Assets held for sale [Abstract]    
Disposal Group, Including Discontinued Operation, Assets, Current $ 4,103,335 $ 4,130,590
Number of employee dormitory buildings sold 3  
Long Lived Assets Held-for-sale, Description As the sale was not yet completed by the end of June 30, 2014, the dormitories were classified as held for sale in accordance with ASC 360-10-35. It was expected that the sales will be consummated by the second half of year 2014.