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Brokerage and Other Receivables, Net (Tables)
9 Months Ended
Dec. 31, 2019
Other Receivables, Net, Current [Abstract]  
Brokerage and other receivables, net
    December 31, 2019     March 31, 2019  
             
Margin lending receivables   $ 155,058     $ 46,716  
Receivables from brokerage clients     1,175       824  
Receivables from sale of securities     1,037       27,684  
Bank commissions receivable     74       -  
Receivable for underwriting and market-making services     65       -  
Dividends accrued     1       108  
Other receivables     47       130  
                 
Allowance for receivables     (240 )     (1,626 )
Total brokerage and other receivables, net   $ 157,217     $ 73,836