Debt Securities (Tables)

12 Months Ended

Jul. 31, 2022

Debt Securities, Trading and Available-for-Sale [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, 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
July 31, 2021
Certificates of deposit*	$	1,200	$	3	$	—		$	1,203
U.S. Treasury bills and notes		1,669		—		(17	)		1,652
Corporate bonds		6,327		38		(33	)		6,332
Municipal bonds		4,825		—		—			4,825
TOTAL	$	14,021	$	41	$	(50	)	$	14,012

* 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, 2022 were as follows:

(in thousands)	Fair Value
Within one year	$	15,374
After one year through five years		3,729
After five years through ten years		2,634
After ten years		566
TOTAL	$	22,303

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, 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
July 31, 2021
U.S. Treasury bills and notes	$	17	$	1,652
Corporate bonds		33		3,293
TOTAL	$	50	$	4,945

Schedule of Continuous Unrealized Loss Position for 12 Months or Longer

At July 31, 2021, there were no securities in a continuous unrealized loss position for 12 months or longer. At July 31, 2022, 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, 2022
U.S. Treasury bills and notes	$	72	$	892
Corporate bonds		234		1,731
TOTAL	$	306	$	2,623