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Income taxes - Pre-tax income (Details)	12 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2019 CNY (¥)	Dec. 31, 2018 CNY (¥)	Dec. 31, 2017 CNY (¥)
Income taxes [Line Items]
Pre-tax income	$ 95,365,488	¥ 663,915,450	¥ 1,084,922,919	¥ 478,575,264
Cayman Islands
Income taxes [Line Items]
Pre-tax income	(1,433,335)	(9,978,594)	(11,832,862)	86,909
Hong Kong
Income taxes [Line Items]
Pre-tax income	(20,140)	(140,208)	(2,423,249)	(17,470)
PRC
Income taxes [Line Items]
Pre-tax income	$ 96,818,963	¥ 674,034,252	¥ 1,099,179,030	¥ 478,505,825

X

- Definition

Amount of income (loss) from continuing operations before deduction of income tax expense (benefit) and income (loss) attributable to noncontrolling interest, and addition of income (loss) from equity method investments.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(h)(1)(i))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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+ References

No definition available.

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