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Profit(loss) before income taxes (Details) - CNY (¥)
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Depreciation Of Property And Equipment ¥ 2,952,000 ¥ 2,973,000 ¥ 2,977,000
Amortization Of Intangible Asset 0 1,000 1,000
Directors      
Salaries And Related Costs 816,000 602,000 1,051,000
Social Benefits Contribution 24,000 11,000 5,000
Share Based Compensation 0 0 37,000
Key Management Personnel (other Than Directors)      
Salaries And Related Costs 1,212,000 1,380,000 1,563,000
Social Benefits Contribution 0 11,000 5,000
Share Based Compensation 0 0 74,000
Other Than Directors And Key Management Personnel      
Salaries And Related Costs 689,000 578,000 707,000
Social Benefits Contribution ¥ 36,000 ¥ 44,000 ¥ 10,000