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Plant and equipment, net - Plant and equipment (Details) - USD ($)
Jun. 30, 2019
Jun. 30, 2018
Plant and equipment    
Net intangible assets $ 8,674,639 $ 7,455,367
Less: accumulated depreciation (4,125,427) (3,492,912)
Total 4,549,212 3,962,455
Buildings    
Plant and equipment    
Net intangible assets 3,950,375 3,620,194
Automobile    
Plant and equipment    
Net intangible assets 118,487 88,038
Electronic devices    
Plant and equipment    
Net intangible assets 3,808,900 3,711,772
Office equipment    
Plant and equipment    
Net intangible assets 34,105 35,363
Leasehold improvements    
Plant and equipment    
Net intangible assets $ 762,772 $ 0