Marketable Securities (Tables)

9 Months Ended

Apr. 30, 2015

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, 2015:
Certificates of deposit*	$	19,290	$	1	$	—		$	19,291
Federal Home Loan Bank bond		995		—		—			995
International agency notes		1,120		2		—			1,122
Municipal bonds		9,967		4		(3	)		9,968
Total	$	31,372	$	7	$	(3	)	$	31,376
July 31, 2014:
Certificates of deposit*	$	10,375	$	—	$	—		$	10,375
Equity securities		31		—		(9	)		22
Municipal bonds		2,475		1		—			2,476
Total	$	12,881	$	1	$	(9	)	$	12,873

* 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	$	20,491
After one year through five years		9,290
After five years through ten years		1,219
After ten years		376
Total	$	31,376

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

	Unrealized Losses		Fair Value
	(in thousands)
April 30, 2015:
Municipal bonds	$	3	$	2,993
July 31, 2014:
Equity securities	$	9	$	22