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v3.25.1

BANK LOANS - Short-term bank loans - Narrative (Details) |  |  |  | 6 Months Ended |  |  |  |
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Jun. 25, 2024 CNY (¥) | Jun. 25, 2024 USD ($) | Jun. 11, 2024 CNY (¥) | Aug. 31, 2022 CNY (¥) | Aug. 31, 2022 USD ($) | Dec. 31, 2024 CNY (¥) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 CNY (¥) | Jun. 25, 2024 USD ($) | Jun. 18, 2024 CNY (¥) | Jun. 18, 2024 USD ($) | Jun. 11, 2024 USD ($) | Aug. 31, 2022 USD ($)
BANK LOANS |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of debt |  |  |  |  |  | ¥ 843,487 | $ 115,557 | ¥ 123,000 |  |  |  |  |
Interest expense on bank loan |  |  |  |  |  | ¥ 169,930 | $ 23,280 | ¥ 159,276 |  |  |  |  |
Bank of Kunlun |  |  |  |  |  |  |  |  |  |  |  |  |
BANK LOANS |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  |  | ¥ 2,900,000 |  |  |  |  |  |  |  |  | $ 397,298
Term of debt |  |  |  | 18 months | 18 months |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  | 6.00% |  |  |  |  |  |  |  |  | 6.00%
Repayments of debt |  |  |  | ¥ 1,000,000 | $ 136,999 |  |  |  |  |  |  |  |
Collateral value of debt |  |  |  | ¥ 6,500,000 |  |  |  |  |  |  |  |  | $ 1,000,000
Industry and Commercial Bank of China ("ICBC") | Revolving loan facility |  |  |  |  |  |  |  |  |  |  |  |  |
BANK LOANS |  |  |  |  |  |  |  |  |  |  |  |  |
Term of debt | 1 year | 1 year |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) | 2.80% |  |  |  |  |  |  |  | 2.80% |  |  |  |
Proceeds from debt | ¥ 10,000,000 | $ 1,369,994 |  |  |  |  |  |  |  |  |  |  |
Collateral value of debt | 17,000,000 |  |  |  |  |  |  |  | $ 2,300,000 |  |  |  |
Maximum borrowing capacity | ¥ 10,000,000 |  |  |  |  |  |  |  | $ 1,369,994 |  |  |  |
China Construction Bank | Revolving loan facility |  |  |  |  |  |  |  |  |  |  |  |  |
BANK LOANS |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  | ¥ 1,105,000 |  |  |  |  |  |  |  |  | $ 151,384 |
Term of debt |  |  | 12 months |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  | 3.95% |  |  |  |  |  |  |  |  | 3.95% |
Industry and Commercial Bank of China ("ICBC") | Revolving loan facility |  |  |  |  |  |  |  |  |  |  |  |  |
BANK LOANS |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  |  | 3.20% | 3.20% |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  | ¥ 476,000 | $ 65,211 |  |

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