Revenues and Gain on Sale of Rights in Wireless Spectrum (Details Textual) (USD $)	12 Months Ended
	Jul. 31, 2013	Jul. 31, 2012
Revenues and Gain on Sale of Rights in Wireless Spectrum (Textual)
Revenues	$ 1,130,000	$ 553,000
Cash Received from Exchange of Licenses		6,800,000
Gain on Exchange of Licenses	150,000	5,330,000
Straight Path IP [Member]
Revenues and Gain on Sale of Rights in Wireless Spectrum (Textual)
Revenues	605,000
Total Settlement Amounts Aggregated	800,000
License patent expiration date	Sep. 25, 2015
Straight Path Spectrum [Member]
Revenues and Gain on Sale of Rights in Wireless Spectrum (Textual)
Cash Received from Exchange of Licenses		6,800,000
Gain on Exchange of Licenses	$ 200,000	$ 5,300,000