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Related party transactions and balances - Short-term loans (Details) - USD ($) | 12 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2017
Related Party Transaction [Line Items] |  |  |
Short-term loans by related parties | $ 329,120 | $ 0 |
Interest expense incurred on short-term loans by related parties | 11,403 | 0 | $ 0
Xia Wang |  |  |
Related Party Transaction [Line Items] |  |  |
Short-term loans by related parties | $ 104,852 | 0 |
Debt, Weighted Average Interest Rate | 9.60% |  |
Penglin Wang |  |  |
Related Party Transaction [Line Items] |  |  |
Short-term loans by related parties | $ 224,268 | $ 0 |
Debt, Weighted Average Interest Rate | 9.60% |  |

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