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Subsequent events (Details)
12 Months Ended
Jul. 21, 2023
shares
Apr. 03, 2023
USD ($)
$ / shares
shares
Mar. 03, 2023
USD ($)
D
$ / shares
Jan. 28, 2022
USD ($)
$ / shares
shares
Jan. 28, 2022
CNY (¥)
shares
Mar. 31, 2023
USD ($)
$ / shares
shares
Mar. 31, 2023
CNY (¥)
shares
Jun. 28, 2023
Mar. 31, 2022
USD ($)
$ / shares
Apr. 22, 2020
$ / shares
Subsequent events                    
Common Stock, Value, Issued | $           $ 2,980     $ 2,980  
Additional paid-in capital | $           $ 19,055,407     $ 18,055,407  
Par value per share | $ / shares           $ 0.0002     $ 0.0002 $ 0.00015
Equity transfer agreement | Wuxi Talent                    
Subsequent events                    
Percentage of interest acquired       60.00%            
Cash payment amount       $ 2,182,866 ¥ 15,000,000 $ 1,902,004 ¥ 13,070,000      
Issuance of shares (in shares) | shares       791,667 791,667 791,667 791,667      
Stock price | $ / shares       $ 3            
Issuance of shares | $           $ 2,375,001        
One-year convertible bond                    
Subsequent events                    
Original principal amount | $     $ 1,000,000              
Annual interest rate percentage     7.00%              
Maturity period     360 days              
Threshold consecutive days | D     5              
Conversion price | $ / shares     $ 1.82              
Conversion price per share | $ / shares     $ 1.82              
Subsequent events                    
Subsequent events                    
Common Stock, Value, Issued | $   $ 110                
Additional paid-in capital | $   $ (110)                
Subsequent events | Common Stock [Member]                    
Subsequent events                    
Conversion price | $ / shares   $ 1.82                
Shares issued | shares   549,451                
Total conversion amount | $   $ 1,000,000                
Conversion price per share | $ / shares   $ 1.82                
Par value per share | $ / shares   $ 0.0002                
Subsequent events | Equity transfer agreement | All Parties [Member]                    
Subsequent events                    
Percent of ownership after transfer 35.00%                  
Subsequent events | Equity transfer agreement | Wuxi Talent                    
Subsequent events                    
Number of shares cancelled | shares 791,667                  
Subsequent events | Wuxi Kingway Cloud Technology Co., Ltd                    
Subsequent events                    
Ownership interest percentage               40.00%