Debt Securities (Tables)

6 Months Ended

Jan. 31, 2022

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)
January 31, 2022:
Certificates of deposit*	$	2,000	$	—	$	(3	)	$	1,997
U.S. Treasury bills and notes		1,660		—		(57	)		1,603
Corporate bonds		6,362		10		(277	)		6,095
Municipal bonds		5,800		—		(5	)		5,795
Total	$	15,822	$	10	$	(342	)	$	15,490
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 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 January 31, 2022 were as follows:

	Fair Value
	(in thousands)
Within one year	$	3,568
After one year through five years		6,379
After five years through ten years		4,869
After ten years		674
Total	$	15,490

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)
January 31, 2022:
Certificates of deposit	$	3	$	1,997
U.S. Treasury bills and notes		57		1,603
Corporate bonds		277		5,698
Municipal bonds		5		5,122
Total	$	342	$	14,420
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 January 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:

	Unrealized Losses		Fair Value
	(in thousands)
U.S. Treasury bills and notes	$	57	$	1,603
Corporate bonds		103		1,453
Total	$	160	$	3,056