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Significant accounting policies - Revenue, Share-based payments and Earnings Per Share (Details)
$ in Thousands
12 Months Ended
Jun. 30, 2022
USD ($)
Nov. 02, 2021
Jun. 30, 2021
USD ($)
Jul. 01, 2020
USD ($)
Jun. 30, 2020
USD ($)
Significant accounting policies          
Current contract assets $ 1,225   $ 740 $ 474 $ 474
Long term contract assets $ 2,567   $ 854 $ 320 $ 320
Vesting percentage of options on the first anniversary of the grant 25.00%        
Periodic vesting period for remaining percentage of options until the fifth anniversary of the commencement date 3 months        
Share consolidation ratio, maximum   7