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Subsequent events (Details) - USD ($)
1 Months Ended 12 Months Ended
Jul. 31, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
Subsequent Events (Textual)          
Shares of common stock, fair value     $ 1,320,000 $ 1,244,001 $ 289,000
Two Service Providers [Member]          
Subsequent Events (Textual)          
Issuance date   Jul. 31, 2018      
Closing price   $ 5.65   $ 5.65  
Shares of common stock   500,000      
Shares of common stock, fair value   $ 2,825,000      
Two Service Providers [Member] | Subsequent Event [Member]          
Subsequent Events (Textual)          
Issuance date Jul. 19, 2019        
Closing price $ 3.5        
Shares of common stock 400,000        
Shares of common stock, fair value $ 1,400,000