Consolidated Balance Sheets (Parenthetical) - USD ($) shares in Thousands, $ in Thousands	Jan. 31, 2017	Jul. 31, 2016
Net of allowance for doubtful accounts	$ 7	$ 0
Accounts payable, related party	$ 43	$ 0
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	3,000	3,000
Preferred stock, shares issued
Preferred stock, shares outstanding
Treasury stock, shares	40	40
Common Stock | Class A common stock
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	2,000	2,000
Common stock, shares issued	787	787
Common stock, shares outstanding	787	787
Common Stock | Class B common stock
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	40,000	40,000
Common stock, shares issued	11,741	11,701
Common stock, shares outstanding	11,431	11,391