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Summary of significant accounting policies - Additional information (Details)
$ / shares in Units, ¥ in Millions
 6 Months Ended 12 Months Ended
Apr. 01, 2019
Mar. 31, 2022
USD ($)
$ / shares
¥ / $
shares
Mar. 30, 2022
$ / shares
shares
Mar. 31, 2021
USD ($)
$ / shares
¥ / $
shares
Mar. 30, 2021
$ / shares
shares
Sep. 30, 2021
USD ($)
¥ / $
Mar. 31, 2022
CNY (¥)
¥ / $
Accounting Policies [Line Items]              
Distribute percentage of earnings after eliminating variable interest entity accumulated gain losses   95          
Percentage of Variable interest entity after tax net income gain loss   10          
Percentage of service fee is subject value added sales tax   6          
Percentage of service fee is subject value added other taxes   12          
Subject to corporate income tax maximum percentage of net income loss   25          
Cash, FDIC insured amount   $ 78,873         ¥ 0.5
Cash maintained with People's Republic of China   $ 53,477,429       $ 3,985,359  
Investment Interest Rate   2.05%       2.00% 2.05%
Short-term deposit   $ 39,436,531       $ 2,793,556  
Allowance for doubtful accounts   8,043       8,094  
Allowance for doubtful debts relating to advances to suppliers   363,115       0  
Inventory reserve   0       0  
Impairment of long-lived assets   0   $ 0      
Contract liabilities, current   37,897       12,177  
Cash equivalents   $ 78,873         ¥ 0.5
Practical expedient to use hindsight [true false]   false          
ROU assets   $ 953,209       $ 776,665  
Exchange rates (per RMB1) | ¥ / $   0.1577       0.1552 0.1577
Average exchange rates | ¥ / $   0.1573   0.1529      
Applicable VAT rate   13% or 17%          
Tax Rate 9% or 13% 12% or 16%          
Uncertain tax positions   $ 0       $ 0  
Weighted average number of shares1              
Basic | shares   22,583,259 564,581,482 834,226 20,855,641    
Diluted | shares   22,583,259 564,581,482 834,226 20,855,641    
Basic (loss) earnings per ordinary share | $ / shares   $ (0.03) $ 0.00 $ 1.63 $ 0.07    
Continuing operations | $ / shares   (0.03)   1.65 0.07    
Discontinued operations | $ / shares       (0.02) 0.00    
Diluted (loss) earnings per ordinary share | $ / shares   (0.03) $ 0.00 1.63 0.07    
Continuing operations | $ / shares   $ (0.03)   1.65 0.07    
Discontinued operations | $ / shares       $ (0.02) $ 0.00    
Shipping and handling              
Accounting Policies [Line Items]              
Shipping and handling expenses   $ 105,918   $ 146,366