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Accounts receivable, net - Movement (Details) - USD ($)
12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
Movements of allowance for doubtful accounts      
Beginning balance $ 1,622,964 $ 703,604  
Addition 743,986 918,940 $ 175,317
Write off 0 0  
Exchange rate effect (62,133) 420  
Ending balance $ 2,304,817 $ 1,622,964 $ 703,604