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Loan receivables (Details)
¥ in Millions
12 Months Ended
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Nov. 01, 2015
CNY (¥)
Nov. 01, 2015
USD ($)
Loan receivables          
Loan amount       ¥ 8 $ 1,200,000
Remaining interest receivable   $ 1,957,720      
Allowance for interest receivable (in Percent) 100.00%        
Loan gross $ 0 1,957,720      
Loan net 0 1,480,136      
Interest income $ 0 $ 384,788 $ 735,200