Related Party Transactions (Details Textual) - USD ($)	1 Months Ended			12 Months Ended
	Oct. 31, 2015	Sep. 30, 2015	Nov. 01, 2012	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2013
Related Party Transaction [Line Items]
Amount billed for electricity supplied and natural gas						$ 16,000
Number of Straight Path Class B common stock received					64,624
Amount paid for Straight Path Class B common stock received					$ 2,100,000
Annual rent payment			$ 69,025
Lease period			1 year
Lease renewal period			1 year
Outstanding net loan receivable from employees				$ 200,000	300,000
Sale of shares		$ 2,600,000		35,011,000	24,126,000	17,323,000
Gain on sale of shares	$ 500,000			500,000
Straight Path [Member]
Related Party Transaction [Line Items]
Receivable from subsidiaries included in other current assets
Amount billed for electricity supplied and natural gas					1,100,000	800,000
Jonas Media Group [Member]
Related Party Transaction [Line Items]
Receivable from subsidiaries included in other current assets				6,000	7,000
Rent received for office space, connectivity and other services				22,000	21,000	18,000
Zedge [Member]
Related Party Transaction [Line Items]
Receivable from subsidiaries included in other current assets				300,000
Amount billed for electricity supplied and natural gas				600,000
IGM Brokerage Corp [Member]
Related Party Transaction [Line Items]
Commissions and fees from payment by company				22,000	20,000	20,000
Insurance payment made by the company
Howard Jonas [Member]
Related Party Transaction [Line Items]
Payable to officer				92,400
Genie and Subsidiaries [Member]
Related Party Transaction [Line Items]
Receivable from subsidiaries included in other current assets				300,000	500,000
Amount billed for electricity supplied and natural gas				2,200,000	3,600,000	3,100,000
Mason and Company [Member]
Related Party Transaction [Line Items]
Commissions and fees from payment by company				$ 24,000	$ 18,000	$ 18,000