Earnings (Loss) Per Share (Details) - shares shares in Thousands	3 Months Ended		9 Months Ended
	Apr. 30, 2016	Apr. 30, 2015	Apr. 30, 2016	Apr. 30, 2015
Basic and Diluted weighted-average number of shares [Abstract]
Basic weighted-average number of shares	11,905	11,449	11,856	11,426
Effect of dilutive securities:
Shares underlying stock options		5		6
Non-vested restricted Class B common stock		425		405
Diluted weighted-average number of shares	11,905	11,879	11,856	11,837