Debt Securities (Tables)

12 Months Ended

Jul. 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:

(in thousands)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
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
July 31, 2022
Certificates of deposit*	$	2,000	$	—	$	(14	)	$	1,986
U.S. Treasury bills and notes		13,848		—		(114	)		13,734
Corporate bonds		3,966		1		(416	)		3,551
Municipal bonds		3,035		—		(3	)		3,032
TOTAL	$	22,849	$	1	$	(547	)	$	22,303

* Each of the certificates of deposit held by the Company 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 July 31, 2023 were as follows:

(in thousands)	Fair Value
Within one year	$	35,176
After one year through five years		6,019
After five years through ten years		1,172
After ten years		47
TOTAL	$	42,414

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:

(in thousands)	Unrealized Losses		Fair Value
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
July 31, 2022
Certificates of deposit	$	14	$	1,986
U.S. Treasury bills and notes		114		13,734
Corporate bonds		416		3,514
Municipal bonds		3		2,412
TOTAL	$	547	$	21,646

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:

(in thousands)	Unrealized Losses		Fair Value
July 31, 2023
U.S. Treasury bills and notes	$	86	$	816
Corporate bonds		484		3,299
TOTAL	$	570	$	4,115
July 31, 2022
U.S. Treasury bills and notes	$	72	$	892
Corporate bonds		234		1,731
TOTAL	$	306	$	2,623