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Marketable Securities (Details) - USD ($)
$ in Thousands
Apr. 30, 2016
Jul. 31, 2015
Schedule of Available-For-Sale Securities [Line Items]    
Amortized Cost $ 46,763 $ 40,862
Gross Unrealized Gains 91 12
Gross Unrealized Losses (217) (587)
Fair Value 46,637 40,287
Certificates of Deposit [Member]    
Schedule of Available-For-Sale Securities [Line Items]    
Amortized Cost [1] 18,309 22,736
Gross Unrealized Gains [1] 5 3
Gross Unrealized Losses [1] (1) (2)
Fair Value [1] 18,313 22,737
Federal Government Sponsored Enterprise notes [Member]    
Schedule of Available-For-Sale Securities [Line Items]    
Amortized Cost 5,821  
Gross Unrealized Gains 10  
Gross Unrealized Losses (3)  
Fair Value 5,828  
Mutual funds [Member]    
Schedule of Available-For-Sale Securities [Line Items]    
Amortized Cost $ 5,092 $ 5,000
Gross Unrealized Gains
Gross Unrealized Losses $ (102) $ (18)
Fair Value 4,990 4,982
Corporate bonds [Member]    
Schedule of Available-For-Sale Securities [Line Items]    
Amortized Cost 2,570  
Gross Unrealized Gains $ 24  
Gross Unrealized Losses  
Fair Value $ 2,594  
Equity [Member]    
Schedule of Available-For-Sale Securities [Line Items]    
Amortized Cost $ 2,463  
Gross Unrealized Gains  
Gross Unrealized Losses $ (109)  
Fair Value 2,354  
U.S. Treasury notes [Member]    
Schedule of Available-For-Sale Securities [Line Items]    
Amortized Cost 2,686  
Gross Unrealized Gains $ 43  
Gross Unrealized Losses  
Fair Value $ 2,729  
Municipal Bonds [Member]    
Schedule of Available-For-Sale Securities [Line Items]    
Amortized Cost 9,822 9,125
Gross Unrealized Gains 9 9
Gross Unrealized Losses (2) (3)
Fair Value $ 9,829 9,131
Federal Home Loan Bank bonds [Member]    
Schedule of Available-For-Sale Securities [Line Items]    
Amortized Cost   $ 795
Gross Unrealized Gains  
Gross Unrealized Losses  
Fair Value   $ 795
International agency notes [Member]    
Schedule of Available-For-Sale Securities [Line Items]    
Amortized Cost   $ 1,120
Gross Unrealized Gains  
Gross Unrealized Losses   $ (1)
Fair Value   1,119
Straight Path Communications Inc. common stock [Member]    
Schedule of Available-For-Sale Securities [Line Items]    
Amortized Cost   $ 2,086
Gross Unrealized Gains  
Gross Unrealized Losses   $ (563)
Fair Value   $ 1,523
[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.