Debt Securities (Tables)

12 Months Ended

Jul. 31, 2021

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, 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
July 31, 2020
Certificates of deposit*	$	13,844	$	58	$	—		$	13,902
U.S. Treasury bills		2,498		—		—			2,498
Municipal bonds		1,979		—		(16	)		1,963
TOTAL	$	18,321	$	58	$	(16	)	$	18,363

* 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 July 31, 2021 were as follows:

(in thousands)	Fair Value
Within one year	$	2,489
After one year through five years		7,463
After five years through ten years		3,771
After ten years		289
TOTAL	$	14,012

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, 2021
U.S. Treasury bills and notes	$	17	$	1,652
Corporate bonds		33		3,293
TOTAL	$	50	$	4,945
July 31, 2020
Municipal bonds	$	16	$	1,963