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SECURITIES SOLD, NOT YET PURCHASED AT FAIR VALUE - Reconciliation of securities (Details) - USD ($) $ in Thousands | 12 Months Ended
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Mar. 31, 2023 | Mar. 31, 2022
Investments, Debt and Equity Securities [Abstract] |  |
Securities sold, not yet purchased at fair value, beginning balance | $ 13,865 | $ 8,569
Short sales | 394 | 7,055
Repurchase | (15,650) | (346)
Net gain on trading securities | 1,391 | (1,413)
Securities sold, not yet purchased at fair value, ending balance | $ 0 | $ 13,865

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