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Nature of business and organization - Additional information (Details) |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
May 10, 2019 USD ($) $ / shares shares | Jul. 02, 2018 CNY (¥) store | Jul. 02, 2018 USD ($) store | Jun. 30, 2019 USD ($) $ / shares | Jun. 30, 2018 USD ($) $ / shares | Jun. 30, 2017 USD ($) | May 31, 2019 | May 31, 2018
Common Stock, Par or Stated Value Per Share | $ / shares |  |  |  | $ 0.01 | $ 0.01 |  |  |
Proceeds from Issuance Initial Public Offering | $ |  |  |  | $ 4,395,634 | $ 0 | $ 0 |  |
Initial public offering |  |  |  |  |  |  |  |
Sale of Stock, Number of Shares Issued in Transaction | shares | 1,172,360 |  |  |  |  |  |  |
Common Stock, Par or Stated Value Per Share | $ / shares | $ 0.01 |  |  |  |  |  |  |
Sale of Stock, Price Per Share | $ / shares | $ 5.00 |  |  |  |  |  |  |
Gross Proceeds from Issuance Initial Public Offering | $ | $ 5,861,800 |  |  |  |  |  |  |
Proceeds from Issuance Initial Public Offering | $ | $ 4,400,000 |  |  |  |  |  |  |
One Major Shareholder [Member] | China Meitai |  |  |  |  |  |  |  |
Ownership interest |  |  |  |  |  |  | 97.74% | 100.00%
China Meitai | Xiangtai Cayman |  |  |  |  |  |  |  |
Ownership interest |  |  |  |  |  |  | 62.73% | 64.17%
CQ Pengmei |  |  |  |  |  |  |  |
Number of Grocery Stores Operated | store |  | 2 | 2 |  |  |  |  |
Business Combination, Consideration Transferred |  | ¥ 5,949,052 | $ 900,000 |  |  |  |  |

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