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Summary of significant accounting policies - Earnings per share ("EPS") (Details) - shares
12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
May 10, 2019
Earnings per share ("EPS")      
Redeemable ordinary shares, shares issued 0 725,000 725,000
Redeemable ordinary shares, shares outstanding 0 725,000 725,000
Incremental common shares attributable to dilutive effect of ordinary shares with redemption rights 623,699 83,151  
Number of warrants 4,667    
Incremental common shares attributable to call options and warrants 1,867    
Warrant      
Earnings per share ("EPS")      
Amount of Antidilutive securities excluded from computation of earnings per share 1,172,360