Earnings (Loss) Per Share (Details) In Thousands, unless otherwise specified	3 Months Ended
	Oct. 31, 2014	Oct. 31, 2013
Basic and Diluted weighted-average number of shares [Abstract]
Basic weighted-average number of shares	11,398	10,508
Effect of dilutive securities:
Shares underlying stock options	10
Non-vested restricted Class B common stock	395
Diluted weighted-average number of shares	11,803	10,508