DEBT SECURITIES ISSUED (Details) - USD ($) $ in Thousands  | 
Jun. 30, 2021  | 
Mar. 31, 2021  | 
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| DEBT SECURITIES ISSUED | ||
| Debt securities issued denominated in USD | $ 50,540 | $ 60,743 | 
| Debt securities issued denominated in RUB | 6,909 | 6,605 | 
| Accrued interest | 674 | 1,095 | 
| Total | $ 58,123 | $ 68,443 | 
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- Definition The total amount of investments that are intended to be held for an extended period of time (longer than one operating cycle). Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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