Business Segment Information (Details) (USD $)	12 Months Ended
	Jul. 31, 2014	Jul. 31, 2013	Jul. 31, 2012
Summary of operating results for the business segments
Revenues	$ 4,796,000	$ 1,130,000
Loss from operations	(692,000)	(3,615,000)
Gain on sale of rights in wireless spectrum included in loss from operations		150,000
Loss on settlement of Straight Path Spectrum legal proceedings included in loss from operations		(1,150,000)
Straight Path Spectrum [Member]
Summary of operating results for the business segments
Revenues	424,000	525,000
Loss from operations	(495,000)	(1,891,000)
Gain on sale of rights in wireless spectrum included in loss from operations		150,000	5,330,000
Loss on settlement of Straight Path Spectrum legal proceedings included in loss from operations		(1,150,000)
Straight Path IP Group [Member]
Summary of operating results for the business segments
Revenues	4,372,000	605,000
Loss from operations	(197,000)	(1,724,000)
Gain on sale of rights in wireless spectrum included in loss from operations
Loss on settlement of Straight Path Spectrum legal proceedings included in loss from operations