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BORROWINGS - Long term borrowings (Details)	1 Months Ended		12 Months Ended
BORROWINGS - Long term borrowings (Details)	Mar. 31, 2025 CNY (¥)	Feb. 28, 2025 CNY (¥)	Dec. 31, 2025 USD ($)	Dec. 31, 2025 CNY (¥)	Dec. 31, 2024 USD ($)	Dec. 31, 2024 CNY (¥)	Dec. 31, 2023 USD ($)	Dec. 31, 2023 CNY (¥)	Dec. 31, 2022 CNY (¥)	Dec. 31, 2021 CNY (¥)	Dec. 31, 2025 CNY (¥)	Dec. 31, 2024 CNY (¥)	Sep. 30, 2023 CNY (¥)	Aug. 31, 2023 CNY (¥)	Apr. 30, 2023 CNY (¥)	Nov. 30, 2022 CNY (¥)	Aug. 31, 2022 CNY (¥)	May 31, 2022 CNY (¥)	Sep. 30, 2021 CNY (¥)	Sep. 30, 2020 CNY (¥)
Debt instrument
Amount repaid \| $			$ 17,878,393		$ 8,342,510		$ 13,506,221
Current portion of long-term borrowings \| $			$ 711,359		$ 12,923,599
Borrowings from Shanghai Pudong Development Bank Co., Ltd., one
Debt instrument
Amount borrowed																				¥ 16,500,000
Term of the debt																				3 years
Interest rate (as a percent)																				4.27%
Amount repaid								¥ 11,000,000	¥ 3,850,000	¥ 1,650,000
Borrowings from Shanghai Pudong Development Bank Co., Ltd., two
Debt instrument
Amount borrowed																			¥ 8,500,000
Term of the debt																			3 years
Interest rate (as a percent)																			4.05%
Amount repaid						¥ 7,225,000		850,000	425,000
Borrowings from Shanghai Pudong Development Bank Co., Ltd., three
Debt instrument
Amount borrowed																		¥ 20,000,000
Term of the debt																		3 years
Interest rate (as a percent)																		4.00%
Amount repaid				¥ 8,500,000		9,500,000		1,500,000	¥ 500,000
Current portion of long-term borrowings												¥ 8,500,000
Borrowings from Shanghai Pudong Development Bank Co., Ltd., four
Debt instrument
Amount borrowed																	¥ 20,000,000
Term of the debt																	3 years
Interest rate (as a percent)																	4.00%
Amount repaid				17,000,000		2,000,000		1,000,000
Current portion of long-term borrowings												17,000,000
Borrowings from Shanghai Pudong Development Bank Co., Ltd., Five
Debt instrument
Amount borrowed																¥ 10,000,000
Term of the debt																3 years
Interest rate (as a percent)																4.00%
Amount repaid				8,500,000		1,000,000		500,000
Current portion of long-term borrowings												8,500,000
Borrowings from Shanghai Pudong Development Bank Co., Ltd., Six
Debt instrument
Amount borrowed															¥ 7,000,000
Term of the debt															3 years
Interest rate (as a percent)															3.90%
Amount repaid		¥ 2,025		3,300,000		550,000		150,000
Current portion of long-term borrowings											¥ 3,000,000	3,300,000
Borrowings from Shanghai Pudong Development Bank Co., Ltd., Seven
Debt instrument
Amount borrowed											¥ 10,000,000
Term of the debt			2 years								2 years
Interest rate (as a percent)			2.80%								2.80%
Current portion of long-term borrowings											¥ 2,000,000
Borrowings from Agricultural Bank of China Limited One
Debt instrument
Amount borrowed																		¥ 30,000,000
Term of the debt																		3 years
Interest rate (as a percent)																		4.00%
Amount repaid				22,000,000		5,000,000		3,000,000
Current portion of long-term borrowings												22,000,000
Borrowings from Agricultural Bank of China Limited Two
Debt instrument
Amount borrowed																	¥ 9,900,000
Term of the debt																	3 years
Interest rate (as a percent)																	4.00%
Amount repaid				6,900,000		2,000,000		1,000,000
Current portion of long-term borrowings												6,900,000
Borrowings from Agricultural Bank of China Limited Three
Debt instrument
Amount borrowed																¥ 9,900,000
Term of the debt																3 years
Interest rate (as a percent)																4.00%
Amount repaid				6,900,000		2,000,000		¥ 1,000,000
Current portion of long-term borrowings												6,900,000
Borrowings From Bank of Jiangsu Co., Ltd One
Debt instrument
Amount borrowed														¥ 10,000,000
Term of the debt														18 months
Interest rate (as a percent)														3.80%
Amount repaid		¥ 2,025		9,900,000		100,000
Current portion of long-term borrowings												9,900,000
Borrowings From Bank of Jiangsu Co., Ltd Two
Debt instrument
Amount borrowed													¥ 10,000,000
Term of the debt													18 months
Interest rate (as a percent)													3.80%
Amount repaid	¥ 2,025			¥ 9,900,000		¥ 100,000
Current portion of long-term borrowings												¥ 9,900,000