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Share capital and additional paidin capital (Details) - CNY (¥)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Statement [Line Items]      
Beginning Balance, Amount ¥ 479,375,000 ¥ 479,375,000 ¥ 479,375,000
Shares Issued During The Year, Amount 0 0 0
Ending Balance, Amount 479,375,000 479,375,000 479,375,000
Noncontrolling Interest      
Statement [Line Items]      
Beginning Balance, Amount 95,875,000 95,875,000 95,875,000
Shares Issued During The Year, Amount 0 0 0
Ending Balance, Amount 95,875,000 95,875,000 95,875,000
Ordinary Stock Shares [Member]      
Statement [Line Items]      
Beginning Balance, Amount 326,000 326,000 326,000
Shares Issued During The Year, Amount 0 0 0
Ending Balance, Amount 326,000 326,000 326,000
Additional paid-in capital      
Statement [Line Items]      
Beginning Balance, Amount 383,174,000 383,174,000 383,174,000
Shares Issued During The Year, Amount 0 0 0
Ending Balance, Amount ¥ 383,174,000 ¥ 383,174,000 ¥ 383,174,000
Number of shares [Member]      
Statement [Line Items]      
Beginning Balance, Shares 1,001,131 1,001,131 1,000,862
Shares Issued During The Year, Shares 1,070 1,070 269
Ending Balance, Shares 1,002,201 1,002,201 1,001,131
Total Equity [member]      
Statement [Line Items]      
Beginning Balance, Amount ¥ 383,500,000 ¥ 383,500,000 ¥ 383,500,000
Shares Issued During The Year, Amount 0 0 0
Ending Balance, Amount ¥ 383,500,000 ¥ 383,500,000 ¥ 383,500,000