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Equity - Mezzanine equity (Details) - USD ($)
12 Months Ended
May 10, 2019
Jun. 27, 2018
Mar. 31, 2018
May 26, 2017
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
Subsidiary, Sale of Stock [Line Items]              
Par value per share         $ 0.01 $ 0.01  
Aggregate offering price         $ 200,000 $ 0 $ 0
Number of shares into which redeemable shares have been converted 725,000            
Capital contribution       $ 284,269     $ 284,269
Private placements | The Purchaser, an unrelated third party              
Subsidiary, Sale of Stock [Line Items]              
Number of shares issued   350,000 375,000        
Par value per share   $ 0.01 $ 0.01        
Purchase price per share   $ 3.00 $ 2.00        
Aggregate offering price   $ 1,050,000 $ 750,000