Debt Securities (Tables)

9 Months Ended

Apr. 30, 2024

Investments, Debt and Equity Securities [Abstract]

Schedule of Available-for-sale Securities

The following is a summary of available-for-sale debt securities:

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	(in thousands)
April 30, 2024:
U.S. Treasury bills and notes	$	23,710	$	—	$	(131	)	$	23,579
Government sponsored enterprise notes		2,378		—		(6	)		2,372
Corporate bonds		3,864		—		(431	)		3,433
Total	$	29,952	$	—	$	(568	)	$	29,384
July 31, 2023:
Certificates of deposit*	$	4,080	$	—	$	(4	)	$	4,076
U.S. Treasury bills and notes		31,186		—		(148	)		31,038
Government sponsored enterprise notes		3,881		—		(8	)		3,873
Corporate bonds		3,912		—		(485	)		3,427
Total	$	43,059	$	—	$	(645	)	$	42,414

* Each of the Company’s certificates of deposit has a CUSIP, was purchased in the secondary market through a broker and may be sold in the secondary market.

Schedule of Contractual Maturities of Available-for-sale Debt Securities

The contractual maturities of the Company’s available-for-sale debt securities at April 30, 2024 were as follows:

	Fair Value
		(in thousands)
Within one year	$	21,816
After one year through five years		6,441
After five years through ten years		1,078
After ten years		49
Total	$	29,384

Schedule of Available-for-sale Securities, Unrealized Loss Position

The following available-for-sale debt securities were in an unrealized loss position for which other-than-temporary impairments were not recognized:

	Unrealized Losses		Fair Value
	(in thousands)
April 30, 2024:
U.S. Treasury bills and notes	$	131	$	23,579
Government sponsored enterprise notes		6		2,372
Corporate bonds		431		3,433
Total	$	568	$	29,384
July 31, 2023:
Certificates of deposit	$	4	$	3,356
U.S. Treasury bills and notes		148		31,038
Government sponsored enterprise notes		8		3,873
Corporate bonds		485		3,368
Total	$	645	$	41,635

Schedule of Continuous Unrealized Loss Position for 12 Months or Longer

The following available-for-sale debt securities included in the table above were in a continuous unrealized loss position for 12 months or longer:

	Unrealized Losses		Fair Value
	(in thousands)
April 30, 2024:
U.S. Treasury bills and notes	$	72	$	2,950
Corporate bonds		411		3,218
Total	$	483	$	6,168
July 31, 2023:
U.S. Treasury bills and notes	$	86	$	816
Corporate bonds		484		3,299
Total	$	570	$	4,115