XML 47 R36.htm IDEA: XBRL DOCUMENT v3.8.0.1
Marketable Securities (Details) - USD ($)
$ in Thousands
Oct. 31, 2017
Jul. 31, 2017
Available-for-sale securities:    
Amortized Cost $ 54,287 $ 58,238
Gross Unrealized Gains, Total 61 82
Gross Unrealized Losses, Total (57) (48)
Fair Value 54,291 58,272
Certificates of deposit [Member]    
Available-for-sale securities:    
Amortized Cost [1] 31,908 29,011
Gross Unrealized Gains [1] 2 1
Unrealized Losses [1] (2) (7)
Fair Value [1] 31,908 29,005
Federal Government Sponsored Enterprise notes [Member]    
Available-for-sale securities:    
Amortized Cost 3,217 3,992
Gross Unrealized Gains
Unrealized Losses (17) (14)
Fair Value 3,200 3,978
International agency notes [Member]    
Available-for-sale securities:    
Amortized Cost 402 291
Gross Unrealized Gains
Unrealized Losses (3)
Fair Value 399 291
Mutual funds [Member]    
Available-for-sale securities:    
Amortized Cost 5,391 5,353
Gross Unrealized Gains 56 77
Gross Unrealized Losses
Fair Value 5,447 5,430
Corporate bonds [Member]    
Available-for-sale securities:    
Amortized Cost 3,379 4,643
Gross Unrealized Gains
Unrealized Losses (4)
Fair Value 3,375 4,643
Equity [Member]    
Available-for-sale securities:    
Amortized Cost 75 74
Gross Unrealized Gains
Gross Unrealized Losses (6) (26)
Fair Value 69 48
U.S. Treasury notes [Member]    
Available-for-sale securities:    
Amortized Cost 5,396 6,673
Gross Unrealized Gains
Unrealized Losses (22)
Fair Value 5,374 6,673
Municipal bonds [Member]    
Available-for-sale securities:    
Amortized Cost 4,519 8,201
Gross Unrealized Gains 3 4
Unrealized Losses (3) (1)
Fair Value $ 4,519 $ 8,204
[1] 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.