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Schedule of Unrealized (losses) Gains for All Equity Investments (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jan. 31, 2023
Jan. 31, 2022
Jan. 31, 2023
Jan. 31, 2022
Net losses recognized during the period on equity investments $ (228) $ (2,952) $ (2,169) $ (17,446)
Less: net gains recognized during the period on equity investments sold during the period 22 25 18 10
Unrealized losses recognized during the period on equity investments still held at the reporting date (250) (2,977) (2,187) (17,456)
Rafael Class B Common Stock [Member]        
Unrealized losses recognized during the period on equity investments still held at the reporting date 82 (993) 9 (13,486)
Zedge Class B Common Stock [Member]        
Unrealized losses recognized during the period on equity investments still held at the reporting date $ 3 $ (168) $ (24) $ (330)