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Correction of errors (Details Narrative) - CNY (¥)
¥ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Statement [Line Items]          
General risk reserve       ¥ 4,908  
Prepayment for a property       14,928  
Proceeds received from shareholders' loans understated ¥ 0 ¥ 48,142 ¥ 308,629    
Repayment of shareholders' loans undersated ¥ 0 ¥ 3,000 ¥ 5,000    
Correction Of Errors One [Member]          
Statement [Line Items]          
Equity transaction       6,429  
Expenses payable       14,604  
Reverse merger       8,175  
Net profit overstatement       8,175  
Other payable overstated       14,604  
Shareholders' equity overstated       6,429  
Correction of errors [Member]          
Statement [Line Items]          
Other payable overstated       3,618  
Over Interest Expense       4,349  
Net profit understated       4,349  
Interest payable overstated       731  
Correction of errors two [Member]          
Statement [Line Items]          
Net profit understated       269  
Correction of errors three [Member]          
Statement [Line Items]          
Net profit overstatement       645  
Deferred tax assets overstated       645  
Correction of errors four [Member]          
Statement [Line Items]          
General risk reserve       11,925  
Statutory reserve understated       7,017  
Correction of errors five [Member]          
Statement [Line Items]          
Cash flows generated by operating activities was overstated       121,040 ¥ 213,138
Cash flows used in investing activities was overstated       121,040 213,138
Correction of errors six [Member]          
Statement [Line Items]          
Proceeds received from shareholders' loans understated       38,600 48,000
Repayment of shareholders' loans undersated       ¥ 38,600 ¥ 58,000