Earnings Per Share (Details) - Schedule of weighted-average number of shares used in the calculation of basic and diluted earnings per share - shares	3 Months Ended		6 Months Ended
	Jan. 31, 2022	Jan. 31, 2021	Jan. 31, 2022	Jan. 31, 2021
Earnings Per Share (Details) - Schedule of weighted-average number of shares used in the calculation of basic and diluted earnings per share [Line Items]
Basic weighted-average number of shares	14,297,000	12,633,000	14,289,000	12,412,000
Effect of dilutive securities:
Diluted weighted-average number of shares	14,971,000	13,431,000	15,007,000	12,949,000
Stock options [Member]
Effect of dilutive securities:
Diluted weighted-average number of shares	584,000	698,000	624,000	472,000
Non-vested restricted Class B common stock [Member]
Effect of dilutive securities:
Diluted weighted-average number of shares	68,000	73,000	72,000	44,000
Deferred stock units [Member]
Effect of dilutive securities:
Diluted weighted-average number of shares	22,000	27,000	22,000	21,000