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Marketable Securities (Tables)
 3 Months Ended
Oct. 31, 2017
Marketable Securities [Abstract]  
Summary of marketable securities
  Amortized Cost  Gross Unrealized Gains  Gross Unrealized Losses  Fair Value 
  (in thousands) 
Available-for-sale securities:            
October 31, 2017:            
Certificates of deposit* $31,908  $2  $(2) $31,908 
Federal Government Sponsored Enterprise notes  3,217   —   (17)  3,200 
International agency notes  402   —   (3)  399 
Mutual funds  5,391   56   —   5,447 
Corporate bonds  3,379   —   (4)  3,375 
Equity  75   —   (6)  69 
U.S. Treasury notes  5,396   —   (22)  5,374 
Municipal bonds  4,519   3   (3)  4,519 
Total $54,287  $61  $(57) $54,291 
July 31, 2017:                
Certificates of deposit* $29,011  $1  $(7) $29,005 
Federal Government Sponsored Enterprise notes  3,992   —   (14)  3,978 
International agency notes  291   —   —   291 
Mutual funds  5,353   77   —   5,430 
Corporate bonds  4,643   —   —   4,643 
Equity  74   —   (26)  48 
U.S. Treasury notes  6,673   —   —   6,673 
Municipal bonds  8,201   4   (1)  8,204 
Total $58,238  $82  $(48) $58,272 

 

* 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 debt securities
  Fair Value 
  (in thousands) 
Within one year $31,586 
After one year through five years  17,189 
After five years through ten years  — 
After ten years  — 
Total $48,775
Summary of available-for-sale securities, unrealized loss position
  Unrealized Losses  Fair Value 
  (in thousands) 
October 31, 2017:      
Certificates of deposit $2  $7,040 
Federal Government Sponsored Enterprise notes  17   3,200 
International agency notes  3   399 
Corporate bonds  4   2,737 
Equity  6   69 
U.S. Treasury notes  22   5,374 
Municipal bonds  3   3,998 
Total $57  $22,817 
July 31, 2017:        
Certificates of deposit $7  $12,155 
Federal Government Sponsored Enterprise notes  14   3,529 
Equity  26   48 
Municipal bonds  1   3,349 
Total $48  $19,081
Summary of available-for-sale securities, continuous unrealized loss position
  Unrealized
Losses		  Fair Value 
  (in thousands) 
         
Federal Government Sponsored Enterprise notes $8  $1,362