Schedule of Shares Excluded from the Diluted Earnings (Loss) Per Share (Details) - shares	3 Months Ended		9 Months Ended
	Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2021	Apr. 30, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares excluded from the calculation of diluted earnings per share		1,126,000	713,000	1,646,000
Share-based Payment Arrangement, Option [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares excluded from the calculation of diluted earnings per share		1,126,000	713,000	1,126,000
Non-vested Restricted Class B Common Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares excluded from the calculation of diluted earnings per share				520,000