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Condensed financial information of the Company - Condensed balance sheets (Details)
Mar. 31, 2023
USD ($)
Mar. 31, 2023
CNY (¥)
Mar. 31, 2022
USD ($)
Mar. 31, 2022
CNY (¥)
Mar. 31, 2021
USD ($)
Current assets:          
Cash and cash equivalents $ 20,998,786 ¥ 19,791,079 $ 23,834,125 ¥ 21,206,372  
Prepayments and other current assets 1,136,769   1,671,750    
TOTAL ASSETS 43,642,638   73,092,885    
Current liabilities:          
TOTAL LIABILITIES 16,688,396   22,829,600    
SHAREHOLDERS' EQUITY:          
Ordinary shares, par value $0.0002 per share, 500,000,000 shares authorized; 14,900,000 shares issued and outstanding as of March 31, 2023 and 2022, respectively 2,980   2,980    
Additional paid-in capital 19,055,407   18,055,407    
Statutory reserve 745,590   745,590    
Accumulated profits 8,111,900   29,018,885    
Accumulated other comprehensive income/(loss) (961,635)   2,440,423    
TOTAL SHAREHOLDERS' EQUITY 26,954,242   50,263,285   $ 45,565,172
Parent company | Reportable legal entities          
Current assets:          
Cash and cash equivalents 1,198,204   2,622,624    
Deferred expenses 46,500   48,624    
Prepayments and other current assets     148,355    
Amounts due from subsidiaries and VIE 3,766,314        
Investment in subsidiaries and VIE 22,721,204   48,796,630    
TOTAL ASSETS 27,732,222   51,616,233    
Current liabilities:          
Amounts due to related parties 2,107   2,443    
Amounts due to subsidiaries and VIE     967,522    
Other payables 775,873   382,983    
TOTAL LIABILITIES 777,980   1,352,948    
SHAREHOLDERS' EQUITY:          
Ordinary shares, par value $0.0002 per share, 500,000,000 shares authorized; 14,900,000 shares issued and outstanding as of March 31, 2023 and 2022, respectively 2,980   2,980    
Additional paid-in capital 19,055,407   18,055,407    
Statutory reserve 745,590   745,590    
Accumulated profits 8,111,900   29,018,885    
Accumulated other comprehensive income/(loss) (961,635)   2,440,423    
TOTAL SHAREHOLDERS' EQUITY $ 26,954,242   $ 50,263,285