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Summary of significant accounting policies - Loan receivable from Xiaoying Housing Loans (Details)	12 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2019 CNY (¥)	Dec. 31, 2018 CNY (¥)	Dec. 31, 2019 USD ($)	Dec. 31, 2019 CNY (¥)	Dec. 31, 2018 CNY (¥)
Loan receivable from Xiaoying Housing Loans
Loans receivable from Xiaoying Credit Loans and Revolving Loans, net				$ 41,591,688	¥ 289,553,016
Xiaoying Housing Loan
Loan receivable from Xiaoying Housing Loans
Allowance for loan principal and interest receivables	$ 6,925,150	¥ 48,211,512	¥ 25,911,367	6,925,150	48,211,512	¥ 25,911,367
Loans receivable from Xiaoying Credit Loans and Revolving Loans, net				12,860,994	89,535,665	128,101,279
Loans receivable acquired during the year				9,719,909	67,668,067	184,822,069
Amount of outstanding undiscounted loan receivable				$ 24,534,818	¥ 170,806,499	¥ 195,077,545
Allowance for loans receivable at beginning of the year	3,721,935	25,911,367
Provision for loan receivable from Xiaoying Housing Loans	3,365,601	23,430,641	40,347,875
Less: Charge-offs	(162,386)	(1,130,496)
Allowance for loans receivable at end of the year	$ 6,925,150	¥ 48,211,512	¥ 25,911,367

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- Definition

Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss.

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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale.

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