Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Oct. 31, 2014	Jul. 31, 2014
Net of allowance for doubtful accounts	$ 0	$ 0
Preferred stock, Par value	$ 0.01	$ 0.01
Preferred stock, Shares authorized	3,000,000	3,000,000
Preferred stock, Shares issued
Preferred stock, Shares outstanding
Treasury stock, Shares	36
Common Stock [Member] | Class A common stock
Common stock, Par value	$ 0.01	$ 0.01
Common stock, Shares authorized	2,000,000	2,000,000
Common stock, Shares issued	787,000	787,000
Common stock, Shares outstanding	787,000	787,000
Common Stock [Member] | Class B common stock
Common stock, Par value	$ 0.01	$ 0.01
Common stock, Shares authorized	40,000,000	40,000,000
Common stock, Shares issued	11,197,000	11,013,000
Common stock, Shares outstanding	11,161,000	11,013,000