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Loans payable - employees (Details) - USD ($)
Dec. 31, 2019
Jun. 30, 2019
Loans payable - employees $ 4,444,970 $ 4,593,874
Na Wang [Member]    
Loans payable - employees 2,309,510 2,341,932
Wei Zhang [Member]    
Loans payable - employees $ 2,135,460 $ 2,251,942