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Current assets - cash and cash equivalents - Summary of cash and cash equivalents (Detail) - AUD ($)
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
Cash and cash equivalents [abstract]        
Cash at bank and on hand $ 7,361,000 $ 21,087,000    
Short-term deposits 6,500,000    
Cash and cash equivalents $ 7,361,112 $ 27,586,760 $ 8,764,000 $ 5,434,000