Debt Securities Issued (Details) - USD ($) $ in Thousands  | 
Mar. 31, 2020  | 
Mar. 31, 2019  | 
|---|---|---|
| Debt Securities [Abstract] | ||
| Debt securities issued denominated in USD | $ 64,783 | $ 20,265 | 
| Debt securities issued denominated in RUB | 6,432 | 7,724 | 
| Accrued interest | 1,081 | 549 | 
| Total | $ 72,296 | $ 28,538 | 
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