Consolidated Statement of Equity (Unaudited) - 3 months ended Oct. 31, 2017 - USD ($) $ in Thousands	Total	Additional Paid-In Capital	Accumulated Deficit	Treasury Stock	Noncontrolling Interests	Common Stock Class A Common Stock	Common Stock Class B Common Stock
Balance at Jul. 31, 2017	$ (17,485)	$ 38,377	$ (52,872)	$ (428)	$ (2,690)	$ 8	$ 120
Balance, shares at Jul. 31, 2017						787	11,989
Capital contribution related to IDT settlement agreement and release	10,000	10,000
Gain on sale of Straight Path IP Group	5,195	5,195
Removal of noncontrolling interests due to sale of Straight Path IP Group		(2,919)			2,919
Stock-based compensation - restricted common stock	951	951
Common stock issued for exercises of stock options	8	8
Common stock issued for exercises of stock options, shares							1
Common stock issued for exercises of warrants	1,057	1,057
Common stock issued for exercises of warrants, shares							30
Issuance of warrants with loans payable	50	50
Dividends	(4,500)		(4,500)
Net loss	(15,556)		(15,327)		(229)
Balance at Oct. 31, 2017	$ (20,280)	$ 52,719	$ (72,699)	$ (428)		$ 8	$ 120
Balance, shares at Oct. 31, 2017						787	12,020