Earnings (Loss) Per Share (Details) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jan. 31, 2015	Jan. 31, 2014	Jan. 31, 2015	Jan. 31, 2014
Basic and Diluted weighted-average number of shares [Abstract]
Basic weighted-average number of shares	11,420	10,784	11,409	10,646
Effect of dilutive securities:
Shares underlying stock options			7
Non-vested restricted Class B common stock			421
Diluted weighted-average number of shares	11,420	10,784	11,837	10,646