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Summary of Significant Accounting Policies - Additional information (Details)
12 Months Ended
Mar. 31, 2023
USD ($)
segment
Mar. 31, 2022
USD ($)
Mar. 31, 2021
USD ($)
Mar. 31, 2023
CNY (¥)
Mar. 31, 2022
CNY (¥)
Allowance for doubtful accounts          
Allowance for doubtful accounts $ 0 $ 0      
Employee benefit expenses          
Employee benefit expenses 104,283 92,264      
Selling and marketing expenses:          
Marketing and promotion costs 216,423 699,307      
Research and development costs          
Research and development costs capitalized 0 0 $ 0    
Uncertain tax positions          
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense $ 0 $ 0      
Value added tax ("VAT")          
Value-added tax rate (in percent) 6.00%        
Foreign currency translation          
Year-end spot rate 6.8717 6.3482 6.5712 6.8717 6.3482
Average rate 6.8855 6.4083 6.7720 6.8855 6.4083
Segment reporting          
Reportable segment | segment 1        
Concentration of risks          
RMB denominated cash and cash equivalents $ 20,998,786 $ 23,834,125   ¥ 19,791,079 ¥ 21,206,372