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Related party transactions and balances - Short-term loans (Details) - USD ($)
12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
Related Party Transaction [Line Items]      
Short-term loans by related parties $ 329,120 $ 0  
Interest expense incurred on short-term loans by related parties 11,403 0 $ 0
Xia Wang      
Related Party Transaction [Line Items]      
Short-term loans by related parties $ 104,852 0  
Debt, Weighted Average Interest Rate 9.60%    
Penglin Wang      
Related Party Transaction [Line Items]      
Short-term loans by related parties $ 224,268 $ 0  
Debt, Weighted Average Interest Rate 9.60%