Revenues in Wireless Spectrum (Details Textual) - USD ($) $ in Thousands	3 Months Ended												12 Months Ended
	Jul. 31, 2016	Apr. 30, 2016	Jan. 31, 2016	Oct. 31, 2015	Jul. 31, 2015	Apr. 30, 2015	Jan. 31, 2015	Oct. 31, 2014	Jul. 31, 2014	Apr. 30, 2014	Jan. 31, 2014	Oct. 31, 2013	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2014
Revenues and Gain on Sale of Rights in Wireless Spectrum (Textual)
Revenues	$ 122	$ 219	$ 112	$ 1,703	$ 2,769	$ 2,867	$ 2,781	$ 4,823	$ 3,303	$ 913	$ 453	$ 127	$ 2,156	$ 13,240	$ 4,796
Sales Revenue, Net [Member]
Revenues and Gain on Sale of Rights in Wireless Spectrum (Textual)
Concentration risk percentage														10.00%
Straight Path IP Group [Member]
Revenues and Gain on Sale of Rights in Wireless Spectrum (Textual)
Revenues													1,695	$ 12,814	$ 4,372
Total Settlement Amounts Aggregated													$ 18,300