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) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Available-for-sale securities, beginning balance $ 1  
Available-for-sale securities, ending balance 1 $ 1
Available-for-sale securities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Available-for-sale securities, beginning balance 1 1
Sale of investments that use Level 3 inputs   0
Reclassification to level 3 0  
Reclassification to level 1  
Purchase of investments that use Level 3 inputs 0 0
Revaluation of investments that use Level 3 inputs 0 0
Foreign currency translation 0 0
Available-for-sale securities, ending balance 1 1
Trading securities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Investments beginning 19,069 11,259
Sale of investments that use Level 3 inputs   (2)
Reclassification to level 3 (683)  
Reclassification to level 1 18,408  
Purchase of investments that use Level 3 inputs 10,813 834
Revaluation of investments that use Level 3 inputs (3,013) 6,978
Foreign currency translation 0 0
Investments ending $ 9,144 $ 19,069