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Summary of Significant Accounting Policies (Details Textual)
3 Months Ended 6 Months Ended
Sep. 30, 2020
USD ($)
Vendors
Sep. 30, 2019
USD ($)
Vendors
Sep. 30, 2020
USD ($)
Vendors
Sep. 30, 2019
USD ($)
Vendors
Mar. 31, 2020
USD ($)
Apr. 02, 2019
USD ($)
Mar. 31, 2015
USD ($)
Summary of Significant Accounting Policies (Textual)              
Ownership percentage     100.00%        
Voting ownership interest     50.00%        
Value added tax, percentage     13.00%        
Advertising and promotion costs $ 60,308 $ 76,938 $ 137,376 $ 156,987      
Foreign currency translation, description     The balance sheet amounts, with the exception of equity, at September 30, 2020 and at March 31, 2020 were translated at 1 RMB to 0.1470 USD and at 1 RMB to 0.1410 USD, respectively. The average translation rates applied to income and cash flow statement amounts for the six months ended September 30, 2020 and 2019 were at 1 RMB to 0.1428 USD and at 1 RMB to 0.1446 USD, respectively.        
Insurance covered by own bank             $ 72,800
Bank uncovered amount             72,800
Deposits $ 35,327,793   $ 35,327,793   $ 30,974,714    
Retained earnings           $ 422,354  
Weighted average remaining lease term 2 years 10 months 25 days   2 years 10 months 25 days        
Weighted average discount rate 4.19%   4.19%        
Minimum [Member] | Retail Site [Member]              
Summary of Significant Accounting Policies (Textual)              
Term of agreement for operating leases 3 years   3 years        
Maximum [Member] | Retail Site [Member]              
Summary of Significant Accounting Policies (Textual)              
Term of agreement for operating leases 10 years   10 years        
Cost of Goods, Total [Member]              
Summary of Significant Accounting Policies (Textual)              
Concentration risk, percentage 44.60% 52.20% 39.70% 51.00%      
Number of vendors | Vendors 2 2 2 2      
Advances to Suppliers [Member]              
Summary of Significant Accounting Policies (Textual)              
Concentration risk, percentage 22.50% 28.20% 10.00% 10.00%      
Number of vendors | Vendors 1 1 2 2      
Accounts Receivable [Member]              
Summary of Significant Accounting Policies (Textual)              
Concentration risk, percentage 10.00% 10.00% 10.00% 10.00%      
Sales Revenue, Net [Member]              
Summary of Significant Accounting Policies (Textual)              
Concentration risk, percentage 10.00% 10.00% 10.00% 10.00%      
China, Yuan Renminbi              
Summary of Significant Accounting Policies (Textual)              
Insurance covered by own bank             500,000
Bank uncovered amount             $ 500,000