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Correction of errors (Details)
¥ in Thousands
 12 Months Ended
Dec. 31, 2020
CNY (¥)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2017
$ / shares
Statement [Line Items]          
General and administrative ¥ (8,090) ¥ (13,280) ¥ (20,368)    
Total operating costs and expenses (8,260) (14,978) (22,162)    
Profit beore income tax 19,854 58,616 26,188    
Income tax expense ¥ 0 ¥ 0 ¥ (18,033)    
Adjustment [Member]          
Statement [Line Items]          
Interest expense (note 29.1)       ¥ 4,349  
Total interest expense       4,349  
General and administrative       (8,175)  
Total operating costs and expenses       (8,175)  
Profit beore income tax       (3,826)  
Income tax expense       (914)  
Net profit       (4,740)  
Basic and diluted earnings per share (note 29.5) | $ / shares         $ (0.04)
As Previously Reported [Member]          
Statement [Line Items]          
Interest expense (note 29.1)       (38,140)  
Total interest expense       (38,814)  
General and administrative       (26,720)  
Total operating costs and expenses       (29,858)  
Profit beore income tax       48,202  
Income tax expense       (14,636)  
Net profit       33,566  
Basic and diluted earnings per share (note 29.5) | $ / shares         0.14
As Currently Reported [Member]          
Statement [Line Items]          
Interest expense (note 29.1)       (33,791)  
General and administrative       (34,895)  
Total operating costs and expenses       (38,033)  
Profit beore income tax       44,376  
Income tax expense       (15,550)  
Net profit       28,826  
Basic and diluted earnings per share (note 29.5) | $ / shares         $ 0.10
Total interest expense       ¥ (34,465)