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Debt Securities (Tables)

9 Months Ended

Apr. 30, 2019

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	(in thousands)
Available-for-sale securities:
April 30, 2019:
Municipal bonds	$	301	$	—	$	—		$	301

July 31, 2018:
Certificates of deposit*	$	3,032	$	—	$	—		$	3,032
U.S. Treasury notes		1,693		—		(1	)		1,692
Municipal bonds		888		—		—			888
Total	$	5,613	$	—	$	(1	)	$	5,612

Each of the Company’s certificates of deposit had a CUSIP, was purchased in the secondary market through a broker, and may be sold in the secondary market.

Summary of available-for-sale debt securities

	Fair Value
	(in thousands)
Within one year	$	301
After one year through five years		—
After five years through ten years		—
After ten years		—
Total	$	301

Summary of available-for-sale securities, unrealized loss position

	Unrealized Losses		Fair Value
	(in thousands)
April 30, 2019:
Total	$	—	$	—

July 31, 2018:
U.S. Treasury notes	$	1	$	1,692