Marketable Securities (Tables)

9 Months Ended

Apr. 30, 2017

Marketable Securities [Abstract]

Summary of marketable securities

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	(in thousands)
Available-for-sale securities:
April 30, 2017:
Certificates of deposit*	$	25,991	$	1	$	(5	)	$	25,987
Federal Government Sponsored Enterprise notes		7,910		1		(19	)		7,892
International agency notes		214		1		—			215
Mutual funds		5,252		66		—			5,318
Corporate bonds		3,574		4		(1	)		3,577
Equity		74		—		(3	)		71
U.S. Treasury notes		7,757		9		(6	)		7,760
Municipal bonds		10,002		3		(4	)		10,001
Total	$	60,774	$	85	$	(38	)	$	60,821

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
July 31, 2016:
Certificates of deposit*	$	17,690	$	6	$	—		$	17,696
Federal Government Sponsored Enterprise notes		3,457		17		—			3,474
International agency notes		409		5		—			414
Mutual funds		5,121		—		(39	)		5,082
Corporate bonds		3,633		40		—			3,673
Equity		2,463		—		(140	)		2,323
U.S. Treasury notes		4,946		95		(1	)		5,040
Municipal bonds		15,222		26		(1	)		15,247
Total	$	52,941	$	189	$	(181	)	$	52,949

* 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.

Summary of available-for-sale securities

	Fair Value
	(in thousands)
Within one year	$	36,732
After one year through five years		18,700
After five years through ten years		—
After ten years		—
Total	$	55,432

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

	Unrealized Losses		Fair Value
	(in thousands)
April 30, 2017:
Certificates of deposit	$	5	$	10,455
Federal Government Sponsored Enterprise notes		19		7,469
Corporate bonds		1		749
Equity		3		71
U.S. Treasury notes		6		1,773
Municipal bonds		4		7,412
Total	$	38	$	27,929
July 31, 2016:
Mutual funds	$	39	$	5,082
Equity		140		2,323
U.S. Treasury notes		1		199
Municipal bonds		1		3,112
Total	$	181	$	10,716