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Debt Securities (Tables)
 6 Months Ended
Jan. 31, 2019
Debt Securities [Abstract]  
Summary of marketable debt securities

  Amortized Cost  Gross Unrealized Gains  Gross Unrealized Losses  Fair Value 
  (in thousands) 
Available-for-sale securities:            
January 31, 2019:            
U.S. Treasury notes $749  $      —  $      —  $749 
Municipal bonds  302   —   —   302 
Total $1,051  $—  $—  $1,051 
                 
July 31, 2018:                
Certificates of deposit* $3,032  $—  $—  $3,032 
U.S. Treasury notes  1,693   —   (1)   1,692 
Municipal bonds  888   —   —   888 
Total $5,613  $—  $(1) $5,612 

 

*Each of the Company’s certificates of deposit had 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 $1,051 
After one year through five years  — 
After five years through ten years  — 
After ten years  — 
Total $1,051 
Summary of available-for-sale securities, unrealized loss position

  Unrealized Losses  Fair Value 
  (in thousands) 
January 31, 2019:      
Total $—  $— 
         
July 31, 2018:        
U.S. Treasury notes $1  $1,692