Annual report pursuant to Section 13 and 15(d)

TRADING AND AVAILABLE-FOR-SALE SECURITIES AT FAIR VALUE - Schedule of reconciliation of the beginning and ending balance for investments that use Level 3 inputs (Details)

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TRADING AND AVAILABLE-FOR-SALE SECURITIES AT FAIR VALUE - Schedule of reconciliation of the beginning and ending balance for investments that use Level 3 inputs (Details) - Trading securities - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Investments beginning $ 9,142 $ 19,033
Reclassification to level 3   682
Reclassification to level 1   (18,371)
Reclassification to level 2 (1,339)  
Sale of investments that use Level 3 inputs (5,213)  
Purchase of investments that use Level 3 inputs 2,604 10,812
Revaluation of investments that use Level 3 inputs (56) (3,014)
Investments ending $ 5,138 $ 9,142