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INVESTMENT SECURITIES
6 Months Ended
Sep. 30, 2023
Investments, Debt and Equity Securities [Abstract]  
INVESTMENT SECURITIES Investment Securities
The amortized cost and gross unrealized gains (losses) of marketable investment securities accounted under the fair value method were as follows:
September 30, 2023
Amortized CostGross Unrealized GainsGross Unrealized (Losses)
Fair Value (1)
Corporate debt securities$21,863 $$(1,361)$20,505 
U.S. treasury securities10,723 — (537)10,186 
Certificates of deposit523 — — 523 
Total securities with unrealized gains/(losses)$33,109 $$(1,898)$31,214 

March 31, 2023
Amortized CostGross Unrealized GainsGross Unrealized (Losses)
Fair Value (1)
Corporate debt securities$24,936 $$(1,325)$23,617 
U.S. treasury securities13,400 15 (425)12,990 
Common stock768 — (584)184 
Certificates of deposit518 — — 518 
Total securities with unrealized gains/(losses)$39,622 $21 $(2,334)$37,309 

Scheduled maturities of the debt securities held by the Company included within the investment securities portfolio were as follows:
September 30, 2023March 31, 2023
Amortized CostEstimated Fair ValueAmortized CostEstimated Fair Value
Due within one year$3,969 $3,927 $6,243 $6,254 
Due within years two through five29,140 27,287 33,379 31,055 
Total debt within the investment securities portfolio$33,109 $31,214 $39,622 $37,309