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5. Restricted Cash (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Mar. 31, 2018
Restricted cash $ 38,460  
(Recast)    
Restricted cash   $ 21,962
Brokerage customers' cash    
Restricted cash 28,931 12,963
Deferred distribution payments    
Restricted cash 8,534 8,534
Guaranty deposits    
Restricted cash 732 350
Reserve with Central Bank of Russia    
Restricted cash $ 263 $ 115