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Financial instruments - Additional Information (Detail) - AUD ($) | Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2016
--- | --- | --- | --- | ---
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Net assets denominated in foreign currencies | $ 21,177,000 | $ 28,175,000 |  |
Cash and cash equivalents | 5,434,000 | 5,956,000 | $ 14,455,000 | $ 33,453,000
Foreign currency risk [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Net assets denominated in foreign currencies | $ 1,016,515 | $ 578,937 |  |
Foreign currency risk [member] | US dollars [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Hypothetical percentage change in risk | 10.00% | 10.00% |  |
Interest rate risk [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Hypothetical percentage change in risk | 1.00% | 1.00% |  |
Favourable/adverse effect on profit before tax and equity | $ 54,337 | $ 59,562 |  |

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