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Related party transactions and balances - Additional Information (Details) | Jun. 30, 2019 CNY (¥) | Jun. 30, 2019 USD ($) | Jun. 30, 2018 USD ($) | Dec. 26, 2017 CNY (¥) | Dec. 26, 2017 USD ($)
--- | --- | --- | --- | --- | ---
Related Party Transaction [Line Items] |  |  |  |  |
Loan from bank |  | $ 4,514,380 | $ 4,530,011 |  |
Land-use right pledged as collateral |  | 462,738 | 492,330 |  |
Building property pledged as collateral |  | 4,549,212 | $ 3,962,455 |  |
CQ Mingwen |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Loan from bank |  |  |  | ¥ 9,000,000 | $ 1,400,000
GA Yongpeng |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Land-use right pledged as collateral | ¥ 10,198,100 | 1,500,000 |  |  |
Building property pledged as collateral | ¥ 12,268,800 | $ 1,800,000 |  |  |

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