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Fair Value Measurements (Tables)
6 Months Ended
Jan. 31, 2020
Fair Value Disclosures [Abstract]  
Schedule of balance of assets measured at fair value on a recurring basis
  January 31, 2020 
   Level 1   Level 2   Level 3   Total 
Available-for-sale securities:  (unaudited, in thousands) 
Hedge Funds  $   $   $5,645   $5,645 
Total  $   $   $5,645   $5,645 

 

   July 31, 2019 
   Level 1   Level 2   Level 3   Total 
Available-for-sale securities:  (unaudited, in thousands) 
Hedge Funds  $   $   $5,125   $5,125 
Total  $   $   $5,125   $5,125 
Schedule of assets measured at fair value on a recurring basis using significant unobservable inputs (Level 3)

   Six Months Ended
January 31,
 
   2020   2019 
   (unaudited, in thousands) 
Balance, beginning of period  $5,125   $12,118 
Conversion of Series D Convertible Note       (7,900)
Total gain included in earnings   520    (52)
Balance, end of period  $5,645   $4,166