Debt Securities (Tables)

3 Months Ended

Oct. 31, 2023

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)
October 31, 2023:
Certificates of deposit*	$	1,920	$	—	$	(3	)	$	1,917
U.S. Treasury bills and notes		25,085		—		(141	)		24,944
Government sponsored enterprise notes		3,047		—		(3	)		3,044
Corporate bonds		3,901		—		(564	)		3,337
Total	$	33,953	$	—	$	(711	)	$	33,242
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 October 31, 2023 were as follows:

	Fair Value
		(in thousands)
Within one year	$	26,185
After one year through five years		5,904
After five years through ten years		1,110
After ten years		43
Total	$	33,242

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)
October 31, 2023:
Certificates of deposit	$	3	$	1,917
U.S. Treasury bills and notes		141		24,944
Government sponsored enterprise notes		3		3,044
Corporate bonds		564		3,337
Total	$	711	$	33,242
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)
October 31, 2023:
U.S. Treasury bills and notes	$	66	$	639
Corporate bonds		556		3,216
Total	$	622	$	3,855
July 31, 2023:
U.S. Treasury bills and notes	$	86	$	816
Corporate bonds		484		3,299
Total	$	570	$	4,115