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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Disaggregation of revenue (Details) - USD ($)
12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2020
Disaggregation of Revenue [Line Items]      
Revenue $ 6,311,725 $ 1,772,502 $ 6,959,372
Tax and surcharges (633) (17,567) (44,898)
Net Revenues 6,311,092 1,754,935 6,914,474
Retained earnings (53,107,676) (36,256,612)  
Commission service      
Disaggregation of Revenue [Line Items]      
Revenue 96,332 82,054 0
Recommendation service      
Disaggregation of Revenue [Line Items]      
Revenue 0 0 3,754,738
Revenue from medical devices      
Disaggregation of Revenue [Line Items]      
Revenue 6,000,000    
Interest income      
Disaggregation of Revenue [Line Items]      
Revenue $ 215,393 $ 1,690,448 3,043,096
Other      
Disaggregation of Revenue [Line Items]      
Revenue     $ 161,538