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Other income (Details) - USD ($)
$ in Thousands
12 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2020
Other income [Abstract]      
Net gain on disposal of property, plant and equipment $ 12 $ 0 $ 0
Government grants 0 165 0
Insurance recoveries 0 418 16
Proceeds from the issuance of options to Executive Directors 0 7 0
Other income $ 12 $ 590 $ 16