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Equity - Mezzanine equity (Details) - USD ($)
12 Months Ended
May 10, 2019
Jun. 27, 2018
Mar. 31, 2018
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Subsidiary, Sale of Stock [Line Items]            
Par value per share       $ 0.01 $ 0.01  
Common stock, share price (in dollars per share)       $ 4.6    
Aggregate offering price       $ 0 $ 200,000 $ 0
Number of shares into which redeemable shares have been converted 725,000          
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      
Common stock, share price (in dollars per share)   $ 3.00 $ 2.00      
Aggregate offering price   $ 1,050,000 $ 750,000