Deposits to institutional cooperators, net (Details)	Dec. 31, 2022 CNY (¥)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 CNY (¥)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 CNY (¥)
Deposits to institutional cooperators, net
Deposits to cooperators	¥ 1,773,640,000	$ 257,153,627	¥ 1,502,433,446
Provision for credit losses on deposits to institutional cooperators	(3,322,575)	(481,728)	(2,026,696)	$ (293,843)	¥ (10,318,117)
Deposits to cooperators, net	¥ 1,770,317,425	$ 256,671,899	¥ 1,500,406,750

The carrying amount of the asset transferred to a third party to serve as a deposit, which typically serves as security against failure by the transferor to perform under terms of an agreement.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(17))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Name:	us-gaap_DepositAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant