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Income taxes - Effect of Tax holiday and preferential tax rate (Details)	12 Months Ended
	Dec. 31, 2019 USD ($) $ / shares	Dec. 31, 2019 CNY (¥) ¥ / shares	Dec. 31, 2018 CNY (¥) ¥ / shares
Income taxes
Aggregate amount of tax holiday and preferential tax rate	$ 40,194,099	¥ 279,823,276	¥ 104,548,726
Aggregate effect on basic net income per share | (per share)	$ 0.13	¥ 0.89	¥ 0.36
Aggregate effect on diluted net income per share | (per share)	$ 0.13	¥ 0.88	¥ 0.34

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- References

No definition available.

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- Definition

The amount of income taxes from which a reporting entity is exempt or for which it will receive a reduction in income taxes as a result of the income tax holiday granted by the taxing jurisdiction.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 11.C)
-URI http://asc.fasb.org/extlink&oid=116825942&loc=d3e330215-122817

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- Definition

Per share amount effect of the income tax benefit resulting from the income tax holidays granted by taxing jurisdictions.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 11.C)
-URI http://asc.fasb.org/extlink&oid=116825942&loc=d3e330215-122817

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Diluted net income per share amount effect of the income tax benefit resulting from the income tax holidays granted by taxing jurisdictions.

+ References

No definition available.

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