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Debt Securities (Tables)

9 Months Ended

Apr. 30, 2020

Investments, Debt and Equity Securities [Abstract]

Schedule of marketable debt securities

		Amortized Cost				Gross Unrealized Gains				Gross Unrealized Losses				Fair Value
		(in thousands)
April 30, 2020:
Certificates of deposit*		$	12,864			$	85			$	(1	)		$	12,948
July 31, 2019:
Certificates of deposit*		$	2,234			$	—			$	—			$	2,234
Municipal bonds			300				—				—				300
Total		$	2,534			$	—			$	—			$	2,534

* 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 available-for-sale debt securities

		Fair Value
		(in thousands)
Within one year		$	11,728
After one year through five years			1,220
After five years through ten years			—
After ten years			—
Total		$	12,948

Schedule of available-for-sale debt securities, unrealized loss position

		Unrealized Losses				Fair Value
		(in thousands)
April 30, 2020:
Certificates of deposit		$	1			$	384
July 31, 2019:
Total		$	—			$	—

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Tabular disclosure of fair value of investments in debt and equity securities in an unrealized loss position categorized neither as held-to-maturity nor trading securities.

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Tabular disclosure of marketable securities. This may consist of investments in certain debt and equity securities, short-term investments and other assets.

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